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Showing 401 - 600 of 715 Journals sorted alphabetically
Psicologia Escolar e Educacional     Open Access   (SJR: 0.223, h-index: 3)
Psicologia USP     Open Access   (SJR: 0.123, h-index: 6)
Psychology & Neuroscience     Open Access   (Followers: 13, SJR: 0.172, h-index: 8)
Psychology in Society     Open Access   (Followers: 1)
Psykhe (Santiago)     Open Access   (SJR: 0.194, h-index: 8)
Química Nova     Open Access   (SJR: 0.262, h-index: 50)
Radiologia Brasileira     Open Access   (SJR: 0.211, h-index: 9)
RAE-eletrônica     Open Access   (Followers: 2)
RAM. Revista de Administração Mackenzie     Open Access  
RCOE     Open Access  
REAd : Revista eletrônica de administração     Open Access  
Región y Sociedad     Open Access  
Relações Internacionais (R:I)     Open Access  
Religião e Sociedade     Open Access   (Followers: 3)
Rem : Revista Escola de Minas     Open Access   (SJR: 0.303, h-index: 9)
Revista Andaluza de Medicina del Deporte     Open Access   (Followers: 2, SJR: 0.152, h-index: 6)
Revista Archivo Médico de Camagüey     Open Access  
Revista Árvore     Open Access   (Followers: 2, SJR: 0.606, h-index: 20)
Revista Brasileira de Biologia     Open Access  
Revista Brasileira de Cardiologia Invasiva     Open Access   (SJR: 0.139, h-index: 5)
Revista Brasileira de Ciência Avicola     Open Access   (Followers: 1, SJR: 0.292, h-index: 12)
Revista Brasileira de Ciência do Solo     Open Access   (Followers: 1, SJR: 0.716, h-index: 37)
Revista Brasileira de Ciência Política     Open Access  
Revista Brasileira de Ciências do Esporte     Open Access   (Followers: 1, SJR: 0.147, h-index: 2)
Revista Brasileira de Ciências Farmaceuticas     Open Access  
Revista Brasileira de Ciências Sociais     Open Access   (Followers: 1, SJR: 0.138, h-index: 8)
Revista Brasileira de Cineantropometria & Desempenho Humano     Open Access   (SJR: 0.194, h-index: 13)
Revista Brasileira de Cirurgia Cardiovascular     Open Access   (Followers: 1, SJR: 0.303, h-index: 16)
Revista Brasileira de Cirurgia Plástica     Open Access   (Followers: 1)
Revista Brasileira de Coloproctologia     Open Access  
Revista Brasileira de Economia     Open Access   (Followers: 1, SJR: 0.215, h-index: 8)
Revista Brasileira de Educação     Open Access   (SJR: 0.202, h-index: 6)
Revista Brasileira de Educação Especial     Open Access   (Followers: 1, SJR: 0.205, h-index: 6)
Revista Brasileira de Educação Física e Esporte     Open Access   (Followers: 2)
Revista Brasileira de Educação Medica     Open Access  
Revista Brasileira de Enfermagem     Open Access   (SJR: 0.268, h-index: 13)
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1, SJR: 0.596, h-index: 21)
Revista Brasileira de Engenharia Biomédica     Open Access   (SJR: 0.16, h-index: 4)
Revista Brasileira de Ensino de Fisica     Open Access   (SJR: 0.204, h-index: 6)
Revista Brasileira de Entomologia     Open Access   (Followers: 1, SJR: 0.402, h-index: 20)
Revista Brasileira de Epidemiologia     Open Access   (Followers: 2, SJR: 0.412, h-index: 19)
Revista Brasileira de Estudos de População     Open Access   (Followers: 1, SJR: 0.214, h-index: 7)
Revista Brasileira de Estudos Pedagógicos     Open Access  
Revista Brasileira de Farmacognosia     Open Access   (SJR: 0.447, h-index: 27)
Revista Brasileira de Fisiologia Vegetal     Open Access  
Revista Brasileira de Fruticultura     Open Access   (SJR: 0.442, h-index: 17)
Revista Brasileira de Geofísica     Open Access   (Followers: 1, SJR: 0.181, h-index: 13)
Revista Brasileira de Geriatria e Gerontologia     Open Access  
Revista Brasileira de Historia     Open Access   (Followers: 1, SJR: 0.1, h-index: 5)
Revista Brasileira de Linguística Aplicada     Open Access  
Revista Brasileira de Medicina do Esporte     Open Access   (SJR: 0.184, h-index: 17)
Revista Brasileira de Meteorologia     Open Access   (SJR: 0.191, h-index: 3)
Revista Brasileira de Oftalmologia     Open Access   (SJR: 0.135, h-index: 8)
Revista Brasileira de Otorrinolaringologia     Open Access  
Revista Brasileira de Parasitologia Veterinaria     Open Access   (SJR: 0.535, h-index: 17)
Revista Brasileira de Plantas Medicinais     Open Access   (Followers: 1, SJR: 0.265, h-index: 17)
Revista Brasileira de Política Internacional     Open Access   (SJR: 0.188, h-index: 8)
Revista Brasileira de Psiquiatria     Open Access   (Followers: 1, SJR: 0.823, h-index: 36)
Revista Brasileira de Reumatologia     Open Access   (SJR: 0.354, h-index: 17)
Revista Brasileira de Saúde e Produção Animal     Open Access   (SJR: 0.243, h-index: 5)
Revista Brasileira de Saúde Materno Infantil     Open Access   (SJR: 0.198, h-index: 16)
Revista Brasileira de Sementes     Open Access  
Revista Brasileira de Terapia Intensiva     Open Access   (Followers: 1, SJR: 0.3, h-index: 6)
Revista Brasileira de Zootecnia     Open Access   (Followers: 2, SJR: 0.436, h-index: 39)
Revista CEFAC     Open Access  
Revista Centro Azúcar     Open Access  
Revista Ceres     Open Access   (SJR: 0.433, h-index: 6)
Revista Chapingo. Serie horticultura     Open Access   (SJR: 0.127, h-index: 5)
Revista Chilena de Anatomia     Open Access  
Revista Chilena de Cardiología     Open Access  
Revista Chilena de Cirugia     Open Access   (SJR: 0.135, h-index: 6)
Revista Chilena de Derecho     Open Access   (Followers: 1, SJR: 0.223, h-index: 4)
Revista Chilena de Derecho Privado     Open Access  
Revista Chilena de Enfermedades Respiratorias     Open Access   (SJR: 0.15, h-index: 7)
Revista Chilena de Infectología     Open Access   (SJR: 0.208, h-index: 14)
Revista Chilena de Literatura     Open Access   (Followers: 2, SJR: 0.102, h-index: 3)
Revista Chilena de Neuro-Psiquiatria     Open Access   (SJR: 0.165, h-index: 9)
Revista Chilena de Nutricion     Open Access   (Followers: 1, SJR: 0.198, h-index: 10)
Revista Chilena de Obstetricia y Ginecologia     Open Access   (Followers: 1, SJR: 0.103, h-index: 8)
Revista Chilena de Pediatria     Open Access   (SJR: 0.139, h-index: 11)
Revista Chilena de Radiologia     Open Access   (SJR: 0.101, h-index: 4)
Revista Ciência Agronômica     Open Access   (SJR: 0.578, h-index: 14)
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Científica Ciencia Médica     Open Access  
Revista Científica General José María Córdova     Open Access  
Revista Clínica de Medicina de Familia     Open Access   (Followers: 4)
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral     Open Access   (Followers: 1)
Revista Colombiana de Anestesiología     Open Access   (Followers: 1, SJR: 0.151, h-index: 5)
Revista Colombiana de Antropologia     Open Access   (Followers: 2, SJR: 0.113, h-index: 2)
Revista Colombiana de Biotecnología     Open Access   (Followers: 1)
Revista Colombiana de Educación     Open Access  
Revista Colombiana de Entomología     Open Access   (Followers: 1, SJR: 0.21, h-index: 11)
Revista Colombiana de Estadística     Open Access   (SJR: 0.419, h-index: 6)
Revista Colombiana de Matemáticas     Open Access   (Followers: 1, SJR: 0.102, h-index: 1)
Revista Colombiana de Psicología     Open Access   (SJR: 0.121, h-index: 3)
Revista Contabilidade & Finanças     Open Access  
Revista Costarricense de Cardiología     Open Access  
Revista Costarricense de Psicología     Open Access  
Revista Cubana de Anestesiología y Reanimación     Open Access   (Followers: 1)
Revista Cubana de Angiología y Cirugía Vascular     Open Access  
Revista Cubana de Cirugía     Open Access   (SJR: 0.12, h-index: 4)
Revista Cubana de Endocrinología     Open Access  
Revista Cubana de Enfermería     Open Access   (Followers: 2, SJR: 0.117, h-index: 4)
Revista Cubana de Estomatologí­a     Open Access   (SJR: 0.11, h-index: 4)
Revista Cubana de Farmacia     Open Access   (Followers: 1, SJR: 0.119, h-index: 5)
Revista Cubana de Hematología, Inmunología y Hemoterapia     Open Access   (SJR: 0.119, h-index: 5)
Revista Cubana de Higiene y Epidemiología     Open Access   (SJR: 0.101, h-index: 7)
Revista Cubana de Información en Ciencias de la Salud     Open Access   (SJR: 0.188, h-index: 5)
Revista Cubana de Informática Médica     Open Access  
Revista Cubana de Investigaciones Biomédicas     Open Access   (Followers: 1, SJR: 0.101, h-index: 7)
Revista Cubana de Medicina     Open Access   (Followers: 2, SJR: 0.132, h-index: 6)
Revista Cubana de Medicina General Integral     Open Access   (Followers: 1, SJR: 0.156, h-index: 9)
Revista Cubana de Medicina Militar     Open Access   (Followers: 1, SJR: 0.1, h-index: 7)
Revista Cubana de Medicina Tropical     Open Access   (SJR: 0.141, h-index: 14)
Revista Cubana de Obstetricia y Ginecología     Open Access   (SJR: 0.101, h-index: 8)
Revista Cubana de Oftalmología     Open Access   (Followers: 1)
Revista Cubana de Ortopedia y Traumatología     Open Access   (SJR: 0.1, h-index: 4)
Revista Cubana de Pediatrí­a     Open Access   (SJR: 0.192, h-index: 7)
Revista Cubana de Plantas Medicinales     Open Access   (Followers: 1, SJR: 0.168, h-index: 8)
Revista Cubana de Salud Pública     Open Access   (SJR: 0.253, h-index: 7)
Revista da Educação Física : UEM     Open Access   (Followers: 1, SJR: 0.141, h-index: 3)
Revista da Escola de Enfermagem da USP     Open Access   (Followers: 2, SJR: 0.284, h-index: 19)
Revista da Faculdade de Educação     Open Access  
Revista da Sociedade Brasileira de Fonoaudiologia     Open Access  
Revista da Sociedade Brasileira de Medicina Tropical     Open Access   (SJR: 0.476, h-index: 40)
Revista de Administração Contemporânea     Open Access  
Revista de Administração de Empresas     Open Access   (Followers: 1, SJR: 0.207, h-index: 6)
Revista de Administração Pública     Open Access   (SJR: 0.209, h-index: 9)
Revista de Análisis Económico     Open Access   (SJR: 0.132, h-index: 2)
Revista de Antropologia     Open Access   (Followers: 4)
Revista de Bioética y Derecho     Open Access  
Revista de Biología Marina y Oceanografía     Open Access   (SJR: 0.334, h-index: 16)
Revista de Biología Tropical     Open Access   (Followers: 1, SJR: 0.378, h-index: 27)
Revista de Ciencia Politica     Open Access   (Followers: 2, SJR: 0.168, h-index: 9)
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciências Agrárias     Open Access  
Revista de Ciencias Médicas de Pinar del Río     Open Access  
Revista de Ciencias Sociales     Open Access  
Revista de Derecho     Open Access   (SJR: 0.164, h-index: 4)
Revista de Derecho (Coquimbo)     Open Access  
Revista de Economia Contemporânea     Open Access   (SJR: 0.117, h-index: 4)
Revista de Economía del Caribe     Open Access  
Revista de Economia e Sociologia Rural     Open Access   (Followers: 2, SJR: 0.248, h-index: 7)
Revista de Economía Institucional     Open Access   (SJR: 0.113, h-index: 3)
Revista de Economia Poli­tíca     Open Access   (Followers: 1, SJR: 0.274, h-index: 10)
Revista de Estudios Historico-Juridicos     Open Access   (Followers: 1, SJR: 0.1, h-index: 3)
Revista de Estudios Sociales     Open Access   (Followers: 1, SJR: 0.143, h-index: 4)
Revista de Filosofia     Open Access   (SJR: 0.11, h-index: 3)
Revista de Geografía Norte Grande     Open Access   (Followers: 1, SJR: 0.15, h-index: 7)
Revista de Gestão Costeira Integrada     Open Access  
Revista de Historia Americana y Argentina     Open Access  
Revista de Ingeniería     Open Access  
Revista de la Asociación Española de Neuropsiquiatría     Open Access  
Revista de la Ciencia del Suelo y Nutricion Vegetal     Open Access  
Revista de la Construcción     Open Access   (SJR: 0.259, h-index: 4)
Revista de la Facultad de Derecho y Ciencias Políticas     Open Access  
Revista de la Sociedad Boliviana de Pediatría     Open Access  
Revista de la Sociedad Española de Enfermería Nefrológica     Open Access   (SJR: 0.19, h-index: 4)
Revista de la Universidad Industrial de Santander. Salud     Open Access  
Revista de Medicina Veterinaria     Open Access  
Revista de Microbiologia     Open Access   (Followers: 1)
Revista de Nutrição     Open Access   (SJR: 0.246, h-index: 27)
Revista de Odontologia da UNESP     Open Access  
Revista de Odontologia da Universidade de São Paulo     Open Access  
Revista de Osteoporosis y Metabolismo Mineral     Open Access   (Followers: 2)
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello     Open Access  
Revista de Protección Vegetal     Open Access  
Revista de Psicología del Trabajo y de las Organizaciones     Open Access   (SJR: 0.211, h-index: 4)
Revista de Psiquiatria Clínica     Open Access   (Followers: 1, SJR: 0.192, h-index: 17)
Revista de Psiquiatria do Rio Grande do Sul     Open Access   (Followers: 1)
Revista de Salud Animal     Open Access  
Revista de Salud Pública     Open Access   (Followers: 1, SJR: 0.138, h-index: 16)
Revista de Saúde Pública     Open Access   (Followers: 1, SJR: 0.629, h-index: 56)
Revista de Sociologia e Polí­tica     Open Access   (Followers: 2, SJR: 0.247, h-index: 6)
Revista Dental Press de Ortodontia e Ortopedia Facial     Open Access   (Followers: 1)
Revista Diacrítica     Open Access  
Revista Direito GV     Open Access   (Followers: 1)
Revista do Colégio Brasileiro de Cirurgiões     Open Access   (SJR: 0.252, h-index: 11)
Revista do Departamento de Psicologia. UFF     Open Access  
Revista do Hospital das Clinicas     Open Access  
Revista do Instituto de Estudos Brasileiros     Open Access  
Revista do Instituto de Medicina Tropical de São Paulo     Open Access   (SJR: 0.485, h-index: 37)
Revista Dor     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista electrónica de investigación educativa     Open Access   (SJR: 0.105, h-index: 3)
Revista Española de Cirugía Oral y Maxilofacial     Open Access   (Followers: 1, SJR: 0.121, h-index: 3)
Revista Española de Enfermedades Digestivas     Open Access   (SJR: 0.344, h-index: 29)
Revista Española de Salud Pública     Open Access   (SJR: 0.269, h-index: 26)
Revista Española de Sanidad Penitenciaria     Open Access   (SJR: 0.15, h-index: 3)
Revista Estudos Feministas     Open Access   (SJR: 0.134, h-index: 9)
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1, SJR: 0.133, h-index: 5)
Revista Facultad Nacional de Agronomía, Medellín     Open Access  
Revista Facultad Nacional de Salud Pública     Open Access  
Revista Gaúcha de Enfermagem     Open Access   (SJR: 0.197, h-index: 8)
Revista Geológica de América Central     Open Access  
Revista Geológica de Chile     Open Access  
Revista Gerencia y Políticas de Salud     Open Access   (SJR: 0.144, h-index: 4)
Revista Habanera de Ciencias Médicas     Open Access  

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Journal Cover Latin American Journal of Aquatic Research
  [SJR: 0.356]   [H-I: 16]   [0 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Online) 0718-560X
   Published by SciELO Homepage  [715 journals]
  • Reproductive cycle and size at first sexual maturity of the white shrimp
           Penaeus schmitti (Burkenroad, 1936) in northeastern Brazil

    • Abstract: ABSTRACT The present study aimed to investigate the reproductive cycle and size at first maturity of Penaeus schmitti through a macro and microscopic approach. Between August 2011 and July 2012, 1169 specimens were collected by an artisanal fishing vessel operating a double trawl off the coast of Pernambuco, northeast Brazil. The total proportion of males (42%) was significantly lower than females (58%), corresponding to the sex ratio of 1:1.38. The total body length at first ovarian maturation (TL50) in females was estimated at 14.2 cm. The ovarian development was divided into four distinct stages based on histological characteristics and visual observations. This is the first reported occurrence of vitellogenic oocytes in the spent stage of P. schmitti, indicating a rapid ovarian maturation after spawning. Furthermore, the frequency of maturation stages, diameter of oocytes and gonadosomatic index were distributed homogeneously throughout the study period, reinforce a continuous reproductive cycle for P. schmitti population in northeastern Brazil.
  • Length-weight relationships of top predator fish caught by the sport
           fishing fleet off Cabo San Lucas, Baja California Sur, Mexico

    • Abstract: ABSTRACT Length-weight relationships (LWRs) were estimated for Pacific blue marlin (Makaira nigricans), striped marlin (Kajikia audax), sailfish (Istiophorus platypterus), dolphinfish (Coryphaena hippurus) and yellowfin tuna (Thunnus albacares). These five fish species are key top predators of the pelagic ecosystem and are economically important resources in the sport fishing of Baja California Sur, Mexico. Overall, 53,359 length and weight records were analyzed for the period 1990-2015. LWRs were significant (P < 0.05), with b-values ranging from 2.52 to 3.13.
  • Contributions to the nutrition of the American crocodile Crocodylus acutus
           (Cuvier, 1807) in captivity

    • Abstract: ABSTRACT In this work we evaluated the essential amino acid profile of muscle Crocodylus acutus and calculated their chemical score of main proteins used in their diet in captivity. The separation and identification of amino acids was carried out by high performance liquid chromatography coupled to a fluorescence detector. The calculation of chemical score was obtained by dividing the value of each essential amino acid between the same amino acid of the reference protein. The lowest value of the relationships is the chemical score. The amino acids present in greater quantities in the tail muscle are glutamic acid, lysine and leucine (16.96, 9.84 and 8.87 g amino acid per 100 g of protein, respectively), whereas histidine, methionine and tryptophan (2.99, 2.93 and 0.59 g amino acid per 100 g of protein) were the lowest. The chemical score obtained results showed that the proteins of animal origin, preferably marine fish and supplemented with terrestrial animals ingredients, including beef liver appear to be the most effective. The incorporation of plant proteins in diets for C. acutus does not appear as a viable alternative due to deficiencies in several essential amino acids such as methionine, lysine and threonine.
  • Regionalization in the distribution of larval fish assemblages during
           winter and autumn in the Gulf of California

    • Abstract: ABSTRACT Larval fish composition and abundance were analyzed during February-March (winter) and November-December (autumn) of 2005 to investigate which environmental conditions and mesoscale oceanographic processes affect the distribution of larval fish assemblages in the Gulf of California, and if these variables and processes are useful to delimit specific regions of ichthyofaunal distribution. The overall pattern was mostly a latitudinal gradient of the abundance of two faunistic complexes of larval fish assemblages (temperate northern and tropical southern complexes) strongly associated with the spatial distribution of sea surface temperature. The integration of these results, with previous investigations in the region, lets us confirm that the northern and southern larval fish assemblages extend and contract their distribution ranges according to the latitudinal displacement of the 21°C sea surface isotherm. We identified this to be a valuable criterion to establish the southern distribution limit of the temperate larval fish assemblage, and the 18°C as the northern limit of the tropical larval fish assemblage. However, this general pattern is maintained only in absence of mesoscale oceanographic features (upwelling and eddies) that increase larval drift from the coast to the central region of the Gulf, particularly during the November-December period when longitudinal gradients were stronger than in February-March.
  • Exploring the contribution of dietary protein from poultry by-product meal
           and fish meal to the growth of catfish Ictalurus punctatus by means of
           nitrogen stable isotopes

    • Abstract: ABSTRACT The natural nitrogen stable isotope signatures (δ15N) found in poultry by-product meal (PBM) and fish meal (FM) were used to estimate the relative contribution of dietary nitrogen supplied by both ingredients to the somatic growth of juvenile channel catfish Ictalurus punctatus. Six isonitrogenous and isoenergetic experimental diets were formulated using FM and PBM. Two of these diets consisted of isotopic controls having only one ingredient supplying dietary nitrogen, either FM or PBM. Four combined diets were formulated with varying proportions of these ingredients in order to supply high proportions of PBM (FM:PBM, 50:50, 35:65 20:80 and 5:95) on a nitrogen basis. There were significant differences in mean final weight of fish at the end of the trial. Lower growth was observed as the dietary level of PBM increased. In order to determine the relative contributions of the dietary nitrogen supplied by FM and PBM to catfish growth, an isotopic mixing model was applied. Results indicated that the incorporation of dietary nitrogen supplied by PBM was equivalent to the die tary proportions. The dietary nitrogen available in combined diets containing 50, 65 and 80% of PBM was incorporated in fish bodies as 50, 62 and 81%, respectively. However, high incorporation of dietary nitrogen from PBM was not always reflected in higher growth rates. Results demonstrate the viable use of stable isotopes to determine the allocation of dietary nitrogen and indicate that practical diets for catfish can be formulated with levels of PBM as high as 65% without affecting growth and survival.
  • An update on morphology and distribution of Ruppia filifolia (Philippi)
           Skottsberg in the Magellan region, southern Chile

    • Abstract: ABSTRACT Vegetative and reproductive morphology of Ruppia filifolia (Philippi) Skottsberg is updated and completed by examining natural specimens, reviewing the literature, comparing to specimens from different locations and generating new iconography of the species from waters across the Magellan region, Subantarctic Chile. We expand current knowledge on morphology (rhizome-root, branching, foliage, inflorescence, fruit, habits) and geographical distribution of R. filifolia in Austral South America, with the addition of six new localities for the taxon in Chile. Our results are used to identify this macrophyte and to distinguish it from R. maritima after some authors reported their co-occurrence in the southern tip of South America, leading to taxonomic confusion. Also, the new information on R. filifolia distribution in the Magellan region broadens the research on a neglected seagrass. In the Southern Hemisphere, contrary to global trends of seagrass ecosystems decline, new niche distributions are opening up in southernmost Chile, reflecting environmental changes.
  • Nutritional contribution of fish meal and microalgal biomass produced from
           two endemic microalgae to the growth of shrimp Penaeus vannamei

    • Abstract: ABSTRACT Different sources of microbial biomass have drawn attention as novel ingredients for aquaculture feeds. In the present study, isotopic measurements were applied to determine the contribution of dietary nitrogen supplied by two sources of microalgal biomass and fish meal, to the growth of shrimp Penaeus vannamei. Microalgae Schizochytrium sp. and Grammatophora sp. were isolated from the Sea of Cortez and massively cultured to obtain sufficient biomass. Experimental diets were formulated with low levels of microalgal biomass replacing 5 and 10% of fish meal nitrogen. Nitrogen stable isotope values were determined in ingredients, diets, and shrimp to estimate the relative contributions of the dietary nitrogen and dry matter supplied by these ingredients to the somatic growth. At the end of a feeding trial, significant differences were observed in mean final weight gain. Dietary nitrogen contributions from microalgae were similar to established dietary proportions, but when estimated on a dry matter basis, nutritional contributions were different for a diet containing 10% of Schizochytrium, which contributed 24% of dry matter to growth. Results demonstrate that low dietary inclusion levels of microalgal biomass elicit similar or higher growth rates than diets based on a fish meal only. Isotopic data indicated that microalgae actually contributed protein to tissue accretion.
  • Production and management of shrimp (Penaeus vannamei) in co-culture with
           basil (Ocimum basilicum) using two sources of low-salinity water

    • Abstract: ABSTRACT The aim of this study was to evaluate the production of an aquaponic culture of white shrimp (Penaeus vannamei) and basil (Ocimum basilicum) using two sources of low-salinity water (1.7 g L-1): diluted seawater (DSW) and groundwater (GW) with zero water exchange at a stocking ratio of 4.9 shrimp per basil plant. Six aquaponic treatment systems were constructed: three individual aquaponic systems for DSW-basil, three for GW-basil, and a control (per triplicate) of basil with a hydroponic solution. Stock densities for shrimp were 75 post-larvae m-2 and 16 plants m-2 for basil. With the exception of the yield in the shrimp culture (kg m-2 or ton ha-1), no significant differences (P > 0.05) were found for the final individual weight, survival, growth rate and feed conversion ratio between DSW and GW, whereas for basil, lower yields were found with DSW. No significant differences in the basil production between the control and the treatment GW were found. Feed consumption per kg of total harvested basil was significantly lower (P < 0.05) in GW treatment, while for feed intake in the shrimp farming, where no significant differences were found (P > 0.05). The aquaponic culture of shrimp and basil using these two types of low-salinity water sources showed promising results. The estimates of both crop yields were compared with those recorded in the literature and for commercial field crops from northwest Mexico.
  • Composition, density, and shell use of hermit crabs (Crustacea:
           Paguroidea) from subtidal boulder fields in southeastern Brazil

    • Abstract: ABSTRACT Hermit crabs are common and abundant members of the intertidal community and in sublittoral bottoms, where they play a fundamental role in the trophic chain. This study aimed to determine the composition of the hermit crab fauna, to quantify the density in the natural environment, and to register shells use by main species from subtidal boulder fields, in an island off the southeastern Brazilian coast. Monthly samples were taken from March 2010 to February 2011 on boulder fields on Couves Island, Ubatuba, Brazil, during scuba diving daytime sessions. Three hundred and eighty-three crabs were collected by hand, in a quadrat of 20 m2 belonging to five species: Calcinus tibicen, Dardanus venosus, Pagurus brevidactylus, Paguristes tortugae, and Petrochirus diogenes. The highest densities were recorded for P. brevidactylus and P. tortugae. Hermit crabs occupied shells of 15 gastropod species. Cerithium atratum, Gemophos auritulus, and Morula nodulosa comprised more than 80% of the occupation. The heterogeneity of boulder fields of Couves Island, composed almost entirely of small refuges and crevices, favors the exploration of hermit crab species recorded here, which are characterized by small size. These results, combined with the findings of further studies, can contribute to the development of effective monitoring programs for decapod crustacean species.
  • Reproductive cycle of leopard grouper Mycteroperca rosacea (Streets, 1877)
           held in captivity: relationship between gonad development and sex steroid

    • Abstract: ABSTRACT In this study, sex steroids (E2, T, and 11-KT) concentrations in blood of captive leopard grouper (Mycteroperca rosacea) and their relation to gonad development were determined during a reproductive cycle. Each month, gonad samples from 24 fish were obtained to analyze gonadal maturation and blood was extracted to determine steroid levels. Throughout the year, ovaries showed a higher percentage of primary oocytes. In January, oocytes at early and late vitellogenesis stages increased progressively; from March to June, ovulation rates were high. In females, estradiol levels increased from March and decreased after the spawning season. Lower levels of testosterone were found during the spawning season and 11-KT remained without significant changes throughout the year. Males exhibit a significant increase in E2 from March until July; testosterone remained without significant variation throughout the year, and 11-KT plasma levels increased from March until July and decreased after the spawning season. In this study, we verified the sex change of an organism and the concentrations of sexual steroids were determined and discussed.
  • Reproductive cycle of Hexaplex princeps (Broderip, 1833) from one
           artisanal fishery at the southern coast of Mexico

    • Abstract: ABSTRACT The reproductive cycle of the gastropod Hexaplex princeps (Broderip, 1833) from Puerto Ángel was studied through gonadal histology during two annual periods. The sex proportion for the total collected individuals was not statistically different from parity although most of the time the number of males was slightly larger than that of females, which only outnumbered males during the spawning season. The histological analysis of gonad sections permitted to establish six maturity stages for females: 1 Initial oogenesis, 2 Previtellogenic maturity, 3 Vitellogenic maturity, 4 Maturity, 5 Spawning, 6 Resting, and five for males: 1 Initial spermatogenesis, 2 Maturity, 3 Spawning, 4 Onset of the rest, 5 Resting). Monthly variations in the gonad maturation stages showed that H. princeps has an annual reproductive cycle with a long period of gonadal activity. The spawning season comprised from November to March (females) and from December to March (males) with peaks of activity for both sexes in January. Resting periods of females comprised from March to October and for males May and June. Thus the reproductive events were related to high Chlorophyll concentrations which in turn are due to the upwelling processes resulting from the winds during winter months (November to March). This study provides baseline information that may serve to establish measures for adequate exploitation and for aquaculture implementation of this species in the future.
  • Distribution and abundance of the ichthyoplankton assemblages and its
           relationships with the geostrophic flow along the southern region of the
           California Current

    • Abstract: ABSTRACT The distribution of ichthyoplankton assemblages (summer 1999 and winter 2000) from the southern region of the California Current (CC) off the Baja California Peninsula were analyzed. Latitudinal and ocean-coast distribution limits of the assemblages were associated with the geostrophic flow, which showed the presence of cyclonic and anticyclonic eddies in the northern and central region of the Baja California Peninsula. The comparative analysis of distribution and abundance of the developmental stages (egg to preflexion, flexion, and postflexion larval stages), showed that each mesoscale eddy had a specific ichthyoplankton assemblage, and the ichthyogeographic regionalization of the study area was determined by the presence of eddies and fronts. Retention processes were observed on epipelagic and demersal species where the fish larvae were maintained near the coastal region.
  • Winter distribution of toxic, potentially toxic phytoplankton, and
           shellfish toxins in fjords and channels of the Aysén region, Chile

    • Abstract: The Aysén region (43°-47ºS) has been prone to intensive summer blooms of toxic microalgae and complex toxin profiles in the shellfish. However, their winter distribution, toxin profile, and resting cysts in sediments are poorly known. Frequently detected toxins are: Paralytic Shellfish Toxins (PST); lipophilic toxins, including Diarrheic Shellfish Toxins (DST), Amnesic Shellfish Toxin or Domoic Acid (DA). During a cruise, carried out in winter 2012, samples were collected at 24 stations for phytoplankton analysis and analysis of toxins in mollusks, and at 5 stations, additional samples were taken for toxin analysis in plankton and resting cysts in sediments. The results confirm the presence of microalgae associated with toxins in winter, and a higher sensitivity of the relative abundance (RA) than the cellular density, as a parameter of distribution of the microalgae. The maximum RA values were level 2 (low), for Alexandrium catenella and Protoceratium reticulatum; level 1 (rare) for Alexandrium ostenfeldii, Dinophysis acuminata and D. acuta; levels 3 (regular) and 4 (abundant) for Pseudo-nitzschia spp. seriata complex and Pseudo-nitzschia spp. delicatissima complex, respectively. Only PST in plankton and yessotoxins in mo llusks were detected, whereas cyst densities of A. catenella and P. reticulatum in sediments were 4 and 103 cysts mL-1 of wet sediment, respectively. The analyzed parameters showed a bigger inter-annual variability during the winter period, as it has been reported for the summer.
  • Secondary attachment discs: a new alternative for restoring populations of
           Chondracanthus chamissoi (Gigartinales, Rhodophyta)

    • Abstract: When facing the growing, international demand for the species Chondracanthus chamissoi as a source of carrageenan and for human food consumption, it is very important to generate new aquaculture techniques that allow for its repopulation, maximizing biomass yield whilst reducing the pressures on existing small, natural populations. This paper describes the use of secondary attachment discs (SAD) as a new vegetative propagation technique. It involves the following two stages: i) Tying the tetrasporophytic and cystocarpic fronds to natural substrates (shells and rocks), the conditions generated in the tanks allowed for quick SAD formation (12 days of experimentation), and ii) The maintenance of SAD under normal conditions (at sea for 83 days). The results indicated a quick formation of SAD, a high capacity of persistence (40%), the growth of new apices (4% d-1), quick substrate colonization through colonization discs (SADc), and the formation of reproductive structures. As a result, SAD is therefore proposed as both an innovative way to achieve the recovery of the now reduced natural beds of C. chamissoi and as an alternative to traditional methods of vegetative culturing for a species of high commercial interest.
  • Exotic seaweed in the Chilean coast: spatial and temporal patterns in the
           invasion process

    • Abstract: RESUMEN En este trabajo se propone una lista de 14 especies de macroalgas exóticas en la costa de Chile, además de otras tres especies que, siendo nativas a la costa chilena, han sido introducidas en sectores fuera de su rango natural de distribución. Este listado fue realizado depurando catastros publicados con antelación, e incorporando nuevos reportes. La distribución de macroalgas exóticas no es homogénea a lo largo de la costa, sino que se concentra en sectores cercanos a puertos y centros de cultivos. La mayoría de las especies muestra una distribución bastante acotada y sólo cuatro tienden a ser invasoras (i.e., incrementan su rango de distribución a través del tiempo). Sin embargo, considerando que la mayoría de las introducciones son recientes (últimos 60 años), y la amplitud del rango de distribución se relaciona positivamente con el tiempo de residencia de las especies en la costa chilena, se sugiere que algunas de estas especies podrían estar en etapa de expansión, lo que explicaría su localizada distribución. Este trabajo no sólo actualiza la información relacionada con macroalgas exóticas en la costa chilena, sino que además permite entender el proceso de invasión de estos organismos, a través del análisis de los patrones descritos en estos sistemas.ABSTRACT In this paper we propose a checklist of 14 species of exotic seaweeds on the Chilean coast, and three species which, being native to the Chilean coast, have been introduced in areas outside their natural range. This list was compiled from previously published checklist, debugged the misidentified records, and incorporating new ones. The distribution of exotic seaweeds is not homogeneous along the coast, but it is concentrated in areas near ports and aquaculture centers. Most species display a fairly bounded distribution, and only four tend to invade (i.e., increase its range of distribution over time). However, considering that most introductions are recent (the last 60 years) and the positive relationship between amplitude of the distribution range and residence time of species on the Chilean coast, we suggest that some of these species may be in an expansion phase, which would explain its restricted distribution. This work not only updates the information related to exotic seaweed on the Chilean coast, but also allows us to understand the invasion process, through the analysis of the patterns described in these systems.
  • Evaluation of the entry of white shrimp postlarvae (Decapoda: Penaeidae)
           to a nursery area in the southern Gulf of Mexico

    • Abstract: ABSTRACT The immigration of white shrimp Penaeus setiferus (Decapoda: Penaeidae) postlarvae (Pls) into the Terminos Lagoon was studied to determine the annual pattern of abundance and its relationship with temperature, salinity, tidal current velocity, and river discharge. Zooplankton samples were simultaneously obtained fortnightly at surface, mid-water, and bottom. The nets used were 50 cm in diameter, 1.5 m in length and 505 μm mesh size. The results indicated a postlarval seasonal immigration pattern, with the lowest average density values from March to May and October to November, and significantly higher values from June to September; maximum peaks occurred in June and September. High Pls densities were obtained between one and three hours after the tidal inflow started. Temperature and salinity varied little during each sampling period and had no apparent effect on immigration, but did have an effect on the seasonal abundance cycle. The multiple regression models indicated that the tidal current velocity and the temperature explained 86% of the variation in Pls abundance during immigration to the Terminos lagoon. The larval migration varied at different levels, with highest densities occurring at a medium depth of 5 m. The Pls entered an optimal range of tidal current velocity (between 0.6 and 0.9 m3 s-1). The main entry mechanism was through the tide current of the Selective Tide Stream Transport, where the Pls could also select an optimum current velocity, avoiding the strata of higher turbulence that would imply higher energy expenditures.
  • The effects of L-lysine in the diet of silver catfish (Rhamdia
    female broodstocks

    • Abstract: ABSTRACT The objective of this study was to assess the L-lysine effect in silver catfish, Rhamdia voulezi female reproduction. Four hundred fish were used distributed in a random in 16 net cages (25 fish each x 4 replicates = 100 fish per treatment). The treatments consisted in four diets, isoproteic and isoenergetic (30% crude protein and 3,500 kcal kg-1 digestible energy) with different L-lysine levels: T1: 1.30; T2: 1.40; T3: 1.60 and T4: 1.95%. After 185 days of experiment 18 females per treatment were weighed, measured, and submitted to hormonal induction (0.5 and 5.0 mg kg-1 Carp Pituitary Extract). The females were then sacrificed and had their ovaries, liver and fat removed and the respective organosomatic indices were estimated. With regard to the reproductive parameters, the released oocytes, absolute fecundity and remaining ovaries were influenced (P < 0.05) by the diet, and the highest mean values were observed in the treatment with 1.95% L-lysine. Among the organosomatic indices, only the visceral fat was influenced (P < 0.05). The estradiol levels and the composition of essential amino acid in oocytes were not affected (P > 0.05). We can conclude that L-lysine affects the reproductive parameters and accumulation of visceral fat in R. voulezi.
  • Proteomic characterization of vitellogenins from three species of South
           American fresh water fish

    • Abstract: ABSTRACT Vitellogenins (Vtg) are glycolipophosphoproteins synthesized by oviparous vertebrates as yolk proteins precursors. These proteins have been studied for their role in reproduction and in endocrine disruption. In this work, we report the first proteomic study towards the characterization of Vtg from Pseudoplatystoma fasciatum, Piaractus brachypomus and Colossoma macropomum. Male specimens of each of the three fish species were estradiol-induced (experimental) and non-induced (control). The initial Vtg characterization was made by 2D protein gel electrophoresis of both groups The identification of the high molecular weight spots, presumed to be Vtgs, was assessed by MALDI-TOF mass spectrometry analysis. A post-translational modification study was performed by differential staining of 2D gels in order to visualize phosphoproteins and glycoproteins. Plasma samples from the three species, induced with estrogen, showed three high molecular weight spots with variable isoelectric points. Post-translational modifications showed that Vtgs from P. brachypomus and C. macropomum presented a phosphorylated and glycosylated subunit, while the same subunit in P. fasciatum was only glycosylated. This characterization will help in the development of reliable immunoassays, which could be used for studies of endocrine disruption or for the improvement of artificial spawning, by uncovering the time of fish maturation or sex determination.
  • Rocky reef fish assemblage structure in coastal islands of southern Brazil

    • Abstract: ABSTRACT Within the Brazilian province, rocky reefs and submerged outcrops are among the most important habitats for reef fishes, providing suitable habitats for the development of reef fish communities and consequently sheltering a high ecological diversity. Rocky reef fish assemblages were sampled in seven coastal islands in South Brazil by strip transects of 40 m2 by the underwater visual census to obtain density (fish 40 m-2) and biomass (g 40 m-2). Fish species were also categorized according to trophic category and geographical distribution. In total, 526 strip transects were performed, covering an area of 21,040 m2, providing 19,377 fish, distributed among 73 species of 34 families. Itacolomis Island presented the highest density, followed by Veado Island. Regarding biomass, Itacolomis Island and Pedra da Baleia were the most representative rocky reefs. Mobile invertebrate predator was the trophic category with the highest density and biomass. A total of 60% of the species occur in the Western Atlantic, 20% are Transatlantic and 9.6% are endemic to the Brazilian Province. Our results indicate that despite the similarity in the taxonomic composition among islands, the observed differences in densities and biomass, highlight singular assemblage structures, whether by environmental and/or anthropogenic factors, and dominated by few species, both in density and biomass.
  • Effects of salinity gradients on larval growth and otolith asymmetry of
           austral hake Merluccius australis

    • Abstract: Austral hake Merluccius australis sustain an important demersal fishery in South Pacific and Atlantic oceans. The main spawning and nursery areas are in the Chilean Patagonia, which is characterized by large inputs of freshwater from rivers and ice melting. The spatial distribution of larval austral hake M. australis was studied during spring, and the potential effects of oceanographic conditions (temperature, salinity, vertical stability and turbidity) on early life traits, derived from sagitta otolith microstructure analysis, size-at-age (SAR), individual larval growth (IGR) and bilateral asymmetry (FA6). Larval abundance ranged between 0.86 and 41.55 ind 1000 m-3 (median: 4.08 ind 1000 m-3) and population larval growth estimated by micro-increment counts of sagitta otoliths was 0.129 ± 0.010 mm d-1, with age varying from 4 to 24 days old. All three indicators derived from otolith analysis (SAR, IGR, and FA6) showed positive and significant correlations with vertical salinity gradients; IGR and FA6 were also positively correlated to Brunt-Väisälä frequency (vertical stability) and FA6 was correlated to turbidity. Therefore, larval M. australis were larger-at-age, grew faster and showed more asymmetry in areas with more influence of freshwater runoff in south Pacific Patagonia.
  • First record of a sea spider (Pycnogonida) from an anchialine habitat

    • Abstract: The anchialine fauna from the Yucatan Peninsula has been extensively studied since the 1980's. “Sea spiders” or Pycnogonida, have never been found in these systems before. A record for Anoplodactylus batangensis (Helfer, 1938) from a cenote (sinkhole) in the Yucatan Peninsula, Mexico is presented herein. The pycnogonid was found in waters of the cenote Nohoch Nah Chich, part of the Sac Actun anchialine system, in the State of Quintana Roo. This species was already reported from the northeastern shore of the Yucatan Peninsula, however the record we present herein constitutes the first time a pycnogonid is reported from an anchialine habitat. A brief description of the female A. batangensis is presented for the first time.
  • Survival in juvenile shrimps (Penaeus vannamei) exposed to inactive
           against active white spot virus: a challenge bioassay perspective

    • Abstract: White spot syndrome virus (WSSV) has damaged the Ecuadorian shrimp culture industry severely. The shrimp industry is highly important as it has generated high revenues over the past few years in Ecuador. Therefore, research on preventing devastating viral infections such as WSSV, is of major relevance. This study aimed to evaluate the survival rate in white shrimps (Penaeus vannamei) by using a vaccination method of inactive white spot virus (WSV) against an active WSV infection. A bioassay using 120 shrimps, 60 injected with inactive WSV and 60 injected with shrimp tissue without WSV infection, was conducted. Firstly, 30 specimens injected with inactive WSV were challenged against active WSV after 48 h. The remaining 30 specimens were challenged against shrimp tissue without WSV infection, as a negative control. Secondly, 60 specimens injected with the tissue without WSV infection were challenged as follows: 30 against active WSV and 30 against shrimp tissue without WSV infection. Kaplan-Meier analysis (P ≤ 0.961) of the results showed no significant differences between the groups. Thus, these results showed no decrease in the mortality rate in juvenile shrimps (P. vannamei) after treatment.
  • New record and contribution to the knowledge of Neastacilla californica
           (Boone, 1918) (Isopoda, Arcturidae) on the west coast of Baja California,

    • Abstract: ABSTRACT Information concerning Neastacilla californica is currently scarce. In fact, its distribution range is not yet well defined; this species is currently reported from Point Conception to Point Loma along the California coast, USA, and also in the Gulf of California, Mexico. In this note, we present a new zoogeographical record of N. californica with information derived from a sample of taken in July 2012 during a monitoring expedition in the area inside of the Guerrero Negro Lagoon, at Peninsula de Baja California, Mexico, at 4.3 latitudinal degrees from the southernmost point reported on the Pacific coast. Additionally, we present a comparative summary of the main diagnostic features of this species and a series of photographs that allow observing characteristics of N. californica, contributing to the knowledge of the species.
  • Predation of Aegla denticulata (Crustacea, Aeglidae) upon the ammocoetes
           stage of Geotria australis (Chordata, Petromyzontidae) in a confined

    • Abstract: ABSTRACT First description of Aegla denticulata Nicolet, 1849′s predatory behavior upon Geotria australis Gray, 1851′s ammocoetes larval stage, in a confined artificial environment.
  • First report of courtship and mating behavior by loggerhead sea turtle
           (Caretta caretta) in the Gulf of Ulloa, Baja California Sur, México

    • Abstract: ABSTRACT Courtship and mating behavior are important life cycle aspects of marine turtles not easily observed by researchers. A pair of loggerhead sea turtles (Caretta caretta) was documented circling, attempting and successfully mounting in the Gulf of Ulloa, Mexico. This type of activity is part of an already described courtship and mating behavior for other sea turtle species; however, this is the first report of open-ocean courtship and mating behavior by loggerheads in the Northern Mexican Pacific Ocean.
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