Subjects -> ENVIRONMENTAL STUDIES (Total: 913 journals)
    - ENVIRONMENTAL STUDIES (810 journals)
    - POLLUTION (31 journals)
    - WASTE MANAGEMENT (18 journals)

POLLUTION (31 journals)

Showing 1 - 27 of 27 Journals sorted alphabetically
Aerosol Science and Engineering     Hybrid Journal  
Aerosol Science and Technology     Hybrid Journal   (Followers: 13)
Archives of Environmental Protection     Open Access   (Followers: 3)
Atmospheric Pollution Research     Hybrid Journal   (Followers: 2)
Ciencias Marinas     Open Access   (Followers: 3)
Current Pollution Reports     Hybrid Journal  
Emerging Contaminants     Open Access   (Followers: 1)
Energy and Emission Control Technologies     Open Access   (Followers: 3)
Environmental Chemistry and Ecotoxicology     Open Access  
Environmental Pollutants and Bioavailability     Open Access  
Exposure and Health     Hybrid Journal  
Greenhouse Gases : Science and Technology     Hybrid Journal   (Followers: 4)
Hidrobiológica     Open Access  
Journal of Air Pollution and Health (رتبه علمی- پژوهشی)     Open Access  
Journal of Energy, Environment & Carbon Credits     Full-text available via subscription   (Followers: 4)
Journal of Hazardous, Toxic, and Radioactive Waste     Full-text available via subscription   (Followers: 6)
Journal of Limnology     Open Access   (Followers: 6)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of the Air & Waste Management Association     Hybrid Journal   (Followers: 4)
Jurnal Pengendalian Pencemaran Lingkungan     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Microplastics and Nanoplastics     Open Access   (Followers: 1)
Open Journal of Air Pollution     Open Access   (Followers: 4)
Pollution     Open Access  
Revista Internacional de Contaminación Ambiental     Open Access  
Water, Air, & Soil Pollution : Focus     Hybrid Journal   (Followers: 7)
Water, Air, & Soil Pollution     Open Access   (Followers: 21)
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Latin American Journal of Aquatic Research
Journal Prestige (SJR): 0.289
Citation Impact (citeScore): 1
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 0718-560X
Published by SciELO Homepage  [672 journals]
  • Environmental stressor induces morphological alterations in zooplankton

    • Abstract: ABSTRACT Morphological alterations in zooplankton are induced by exposure to hazardous materials in the environment. These alterations in the body are excellent indicators of adverse effects at the (sub) individual and population levels. These changes might be undetectable within a population in the first generation; however, it was recently documented that alterations are more frequent in the subsequent generations. Because of this, we revised scientific literature that reported malformations in cladocerans, copepods, oligochaetes, and rotifers caused by diverse toxicants when organisms were exposed either in the laboratory or in natural conditions. From an environmental perspective, we focused on the importance of morphological alterations in zooplankton, the most likely causes, and their consequences. Furthermore, the present article shows that alterations of the normal morphology could be used as consistent biomarkers, but further research requires discriminating the influence of natural behavior and the consequences of exposure to toxic compounds.
  • Effect of mushroom (Pleurotus djamor var. roseus) meal as feed
           supplemented on the hematological responses and growth performance of Nile
           tilapia (Oreochromis niloticus) fingerlings

    • Abstract: ABSTRACT This study aimed to evaluate the effects of mushroom meal supplementation, Pleurotus djamor var. roseus (Pd), on the diet of Nile tilapia (Oreochromis niloticus), on hematological parameters and growth performance for 60 days. Nile tilapia fingerlings (3.23 ± 0.19 g) were fed with three experimental diets based on the mushroom meal in different percentages: diet 0% control (MM0), diet 15% (MM15), diet 20% (MM20) and diet 25% (MM25). Blood samples from the fish of all treatments were collected at the start of the experiment (day 0), 30 and 60 days. The weight and size of the fish were determined every 15 days (0, 15, 30, 45 and 60 days). The results showed a significant dose-dependent increase in the levels of erythrocytes count and leukocytes count. The groups that showed significant differences in the basal value and the final control result were hematocrit, hemoglobin, and lymphocyte. An increase in lymphocytes proportion and a decrease in neutrophils were found, which was related to the immune response of fish fed the diet. The highest levels of leukocytes, lymphocytes, and low neutrophils were presented in the diet with 15 and 20% (P < 0.05). The growth (weight gain and specific growth rate) of fish fed MM15 and MM20 of Pd in the diet was higher than the control group (P > 0.05). Dietary supplementation (15 and 20%) improved hematological and defense blood cells, as well as the growth of tilapia.
  • Effect of pond fertilization on growth performance of pirarucu (Arapaima
           gigas) during grow-out phase

    • Abstract: ABSTRACT. Fertilization of aquaculture ponds has been pointed out as an efficient practice to improve fish feed conversion and growth performance. In this way, the present study aimed to assess the effect of pond fertilization on the growth performance, body composition, and water quality of juvenile pirarucu Arapaima gigas reared in earthen ponds (600 m2) during the grow-out phase. Two fertilized and two non-fertilized ponds were stocked with 208 juvenile pirarucus (19.9 ± 3.6 g and 15.0 ± 0.9 cm) and reared for 100 days. All four ponds were limed before the study. Ponds were fertilized before fish were stocked and weekly until the end of the experiment, and fish offered feed until apparent satiation. Pirarucu reared in fertilized ponds presented higher final weight (20%) and biomass (19%), further to lower feed intake and feed conversion rate (1.31) than fish reared in non-fertilized ponds (1.61). Pond fertilization did not affect the fish coefficient of variation, which was reduced over the culture cycle. The body composition of fish reared in fertilized ponds presented higher water content, protein, and energy retention rates and lowered crude fat and energy. Fertilized ponds presented lower transparency levels and higher pH from the 50th day of culture, whereas ammonia concentration was higher in the fertilized ponds in the first 25 days. Therefore, pond fertilization is a recommended practice for pirarucu during the grow-out phase.
  • Effect of sea surface temperature on the growth performance of the thread
           herring Opisthonema libertate (Günther, 1868) in the southern Gulf of

    • Abstract: ABSTRACT. The present study assessed the effect of sea surface temperature (SST) on the individual growth performance of the thread herring Opisthonema libertate in the southern Gulf of California. For the period from 1988 to 2017, based on monthly length-frequency information, the von Bertalanffy equation's growth parameters (L∞, K, and t0) were estimated annually. Annual values of the growth performance index Φ' were inversely related to the SST (P < 0.05). The values of K and L∞ corresponding to the modal value of the distribution of Φ' were taken as representative of the species, and the temperature change pattern function over time was incorporated as a forcing of the growth coefficient, K, in the growth model. Thus, it was possible to represent the yearly effect of SST on growth performance. These estimates are considered of great interest for future research because they directly influence the variability in allocating the number of individuals at different ages.
  • Effect of the shrimp farming wastes as co-feed on growth performance and
           digestibility of juvenile grey mullet, Mugil cephalus

    • Abstract: ABSTRACT. A feeding trial was carried out to evaluate the utilization of residual nutrients from shrimp farming wastes (SFW) as co-feed in juvenile grey mullets Mugil cephalus. Four treatments were designed to offer shrimp farming wastes in different proportions as feed. The first treatment (control) consisted of feeding the entire daily portion with only commercial feed for marine fish (SFW0). The remaining treatments replaced the daily feed with shrimp farming wastes in 33, 66, and 100%, respectively, treatments SWF33, SWF67, and SWF100. Feed was offered daily as 4% of the grey mullet total biomass at each experimental tank. Results showed that final weight, weight gain, specific growth rate, relative weight gain, and thermal growth coefficient were reduced in the fish when the proportion of SFW in their feed was increased. However, the fish showed a digestive capacity that allowed them to use residual nutrients in a ratio up to 66%, increasing their initial weight by up to 25%. The increase of shrimp farming waste as feed negatively affected the whole-body proximal composition. The digestibility results showed that the fish could digest up to 41% of the shrimp farming waste protein. Results suggest that juvenile grey mullets are capable of utilizing residual nutrients from shrimp farming waste. However, it is necessary to complement an alternative feed source to induce an optimal growth performance for the juvenile grey mullets. It is also recommended that mullets be fed with formulated feed to meet their nutritional requirements to maintain the protein and lipid content of the whole body under culture conditions.
  • Hematological and serum chemistry profile in wild Pacific mackerel
           (Scomber japonicus) from Todos Santos Bay, Baja California, Mexico

    • Abstract: ABSTRACT. The Pacific mackerel Scomber japonicus aquaculture is receiving growing attention, and further development of this industry is expected to protect wild stocks. Information on S. japonicus hematology is very limited. Therefore, the present study aimed to provide the hematological and serum chemistry profiles associated with sex and some seasonal variations in Pacific mackerel from Todos Santos Bay, Baja California, Mexico. Fish were sampled in April (spring) and August (summer). Results showed that the condition factor and all blood parameters analyzed in male and female mackerel were not affected by sex (P > 0.05). The seasonality effect on the mackerel was observed in some blood parameters such as mean corpuscular hemoglobin, total protein, globulin, and triglycerides that exhibited lower values in April compared to August (P < 0.05). While white blood cell count was higher in August (P < 0.05) compared with April. The fish sampled during the two sampling times were possibly a heterogeneous group of ages (1 to 3 years) with lengths ranging from 20 to 30 cm. Consequently, there is an urgent need to follow doing reference interval databases to assess Pacific mackerel health status under different conditions.
  • Red mangrove crab Ucides occidentalis (Ortmann, 1987) (Brachyura:
           Ocypodidae): complete embryonic development under laboratory conditions

    • Abstract: ABSTRACT. The red crab Ucides occidentalis (locally called “guariche”) is widely distributed along Ecuador's coastline and is the most important crustacean fishery exploited by local coastal communities. However, a lack of information on the species' reproductive cycle has hindered conservation and sustainable management initiatives. Here we documented for the first time the complete embryonic development of U. occidentalis, based on its morphological traits. Thirteen ovigerous females were collected in the field, maintained in captivity, and fed with leaves and tender mangrove propagules. Egg samples were taken every 12 h and analyzed under the microscope to evaluate embryonic development. U. occidentalis eggs had eight different embryonic stages, which maintained their spherical shape during the entire developmental. The eggs were relatively small and uniform in size. The tenuous heart beating of the precursor coincided with the formation of chromatophores in stage V and became more frequent at stage VIII, just before hatching. The incubation period lasted 15 days. Despite the rapid development, the increase in egg size and volume was not uniform during sequential stages.
  • Planktonic ostracods off the north-central coast of Chile

    • Abstract: ABSTRACT. In the north-central zone of Chile (25°00'-31°40'S), zooplankton samples were taken in 103 oceanographic stations during February-March 2017 (0-70 m). Ostracods were separated, identified, and counted, making it possible to determine their distribution, abundance, species richness, and diversity. Twenty-one species belonging to 12 genera of the Halocyprididae family were identified, three of which had not been previously reported for the southeastern Pacific (Conchoecetta acuminata, Mikroconchoecia stigmatica, and Orthoconchoecia atlantica). The highest abundances, species richness, and diversity were found mainly in stations away from the coast (10 and 20 nm), sampled in hours of darkness. The most abundant species with the highest frequency of occurrence were Archiconchoecia striata, Conchoecetta giesbrechti, Conchoecia magna, and Halocypris inflata. A. striata constituted more than 50% of the total abundance of the ostracods identified.
  • Reproductive cycle of Calamus brachysomus (Teleostei: Sparidae) in the
           Central Gulf of California, BCS, Mexico

    • Abstract: ABSTRACT. The Pacific porgy Calamus brachysomus (Lockington, 1880) is exploited for local consumption and commerce in Baja California Sur (BCS). Monthly samples to study its reproductive biology were obtained from the artisanal fishery operating in Santa Rosalía, BCS, Mexico, from July 2015 to July 2016. A total of 265 specimens were analyzed, including 147 females and 118 males. The sexual proportion (1.24F:1M) did not differ from the expected 1:1 proportion (P = 0.08). There were no significant differences between sexes in total length (P = 0.94). Variations in the hepatosomatic index and condition factor indicated that food constituted the main energy source during reproduction, with possible additional use of endogenous reserves originating in the liver during spawning. The gonads histological analysis indicated an asynchronous ovarian development and batch spawning strategy. There were spawning capable females during 11 of the 13 sampled months; the exceptions were February and September, coinciding with minimum and maximum sea surface temperature (SST) values. These results, along with the gonadosomatic index variations, allowed us to conclude that C. brachysomus reproduces over a large part of the year with an activity peak from May to July, in an SST interval of 21 to 28°C.
  • Dietary supplementation effect of three microalgae on Penaeus vannamei
           growth, biochemical composition, and resistance to Vibrio parahaemolyticus

    • Abstract: ABSTRACT Microalgae are a promising solution in shrimp farming overexploitation. This study assessed the efficacy of microalgae as a food additive for Penaeus vannamei growth and their effect on immune system stimulation against Vibrio parahaemolyticus. Three diets were formulated with 0, 1, and 3% (DC, D1, and D3, respectively) of a mixture of three different microalga species, Tetraselmis suecica, Dunaliella salina, and Chaetoceros muelleri, and growth, survival, and post-harvest quality in shrimp culture were evaluated. Two bioassays were performed: a 60-day feeding trial and an immersion infection bioassay against V. parahaemolyticus. D1 was the best treatment and significantly different to DC (P ≤ 0.05), achieving a food conversion factor of 1.24 ± 0.11 and 1.85 ± 0.38; specific growth rate 1.58 ± 0.03% d−1 and 1.35 ± 0.11% d−1; and weight gain of 5.68 ± 0.32 g and 4.79 ± 0.33 g, respectively. Protein content in shrimp muscle was positively increased by microalgae inclusion, achieving 20.8 ± 0.2% (D1) to 21.7 ± 0.3% (D3), 19.2 ± 0.1% (DC). In the infection bioassay, D1 and D3 reached a 100% survival rate, and histological damage in the hepatopancreas was not observed, suggesting immune system stimulation. These results indicated that microalgae added to food are an excellent source of proteins, carbohydrates, lipids, and promoters of antimicrobial activity that allowed additional protection against mortality caused by V. parahaemolyticus.
  • Fleet efficiency in the Pacific hake (Merluccius productus) fishery in the
           Gulf of California, Mexico

    • Abstract: ABSTRACT The control of the fishing effort and establishment of individual catch quotas has been proposed as a strategy to manage the Pacific hake (Merluccius productus) fishery in the north of the Gulf of California. In this study, the issues related to the efficiency of hake fishing vessels are analyzed. Two different types of vessels, large and small, were identified using the physical characteristics of 53 vessels in a cluster analysis. Using generalized linear models (GLM), efficiency variation (catch per unit of effort CPUE) was assessed with data derived from onboard observations of 74 trips made by 25 vessels and 814 sets from 2015 to 2019. The variables used to determine their contribution to CPUE were years, vessel types, fishing areas, depth strata, and their interactions. The factors year, fishing area, net type, and vessel type explain the interannual variability in the CPUE. The model, which included the interactions, showed 18% of explained deviance and indicated that interactions between year and area and between depth and vessel were significant and contributed the most to the deviance explained by the model. A GLM exhibited 11% of the explained deviance without considering interactions and indicates that large vessels are 1.5 times more efficient than small vessels.
  • The effect of major nutrients in five levels of an f medium on growth and
           proximal composition of Thalassiosira weissflogii

    • Abstract: ABSTRACT This work aims to evaluate its effect on cell density, biomass, and proximal composition in semicontinuous cultures. Thalassiosira weissflogii was cultivated in five culture media, for which the f medium was taken as reference, and the concentrations of nitrates, phosphates, and silicates were modified up to a factor of four in five treatments (f/4, f/2, f, 2f, and 4f). Cell density and biomass increased as the initial nutrients rose in the treatments. Protein and lipids (mg L−1) in the biomass of T. weissflogii were higher in the 2f and 4f treatments for the three partial harvests. The lipid biomass in the cultures was higher than with proteins and carbohydrates for all treatments, with 2f and 4f being the most concentrated. The concentration of nitrates, phosphates, and silicates of the culture media, declined as the cell density increased in all cultures, decreasing more than 90% in phosphates and 94-98% for the silicates for the initial concentrations. At the cell level, the percentage of carbohydrates related to dry weight in T. weissflogii increased as the level of the f treatment decreased. Meanwhile, the protein fraction declined when the level of the f medium was either increased or decreased. The data reported in this study can be useful for producing T. weissflogii in a 30% semicontinuous system, obtaining more controlled biomass production per day with an estimated value of its proximal composition, based on the level of the f medium.
  • Age, growth, and ontogenetic variation in the sagitta otolith of Opsanus
           beta (Goode & Bean, 1880), a non-native species in a wetland of
           international importance

    • Abstract: ABSTRACT Invasive species are among the most important problems for biodiversity conservation worldwide, particularly in megadiverse countries such as Brazil. However, there is no biological information to develop policies for managing invasive species populations in many cases. The life history parameters and otolith variations are essential to understanding the adaptations of the species introduced in marine environments. This study aimed to identify the age structure and ontogenetic variation in the sagitta otolith of Opsanus beta. Fish samples were obtained monthly in the Paranaguá Estuarine Complex (PEC), south of Brazil. The shape indices verified ontogenetic variations in the otoliths (PERMANOVA; F = 110; P < 0.0001), but no sexual variations were observed in the shape of the otoliths (PERMANOVA; F = 3.65; P > 0.05). Specimen aged between 1 to 9 years were observed in the PEC, with the highest occurrence of individuals between 3 and 6 years (78%). No sexual differences were observed between the ages by the Kimura test. Our results confirm that the O. beta population is well established with age groups similar to that observed in the region where the species is native.
  • First in situ record of the deep-sea shark Hexanchus griseus
           (Chondrichthyes: Hexanchidae) off Rapa Nui (Easter Island, Chile), and
           management implications

    • Abstract: ABSTRACT The conservation of threatened sharks requires defining the occurrence and distribution range of the species and key habitats for their survival. During surveys of mesophotic and deeper benthic habitats (50 to 340 m depth) off Rapa Nui (Easter Island, Chile, southeastern Pacific), using a remotely operated vehicle, a male bluntnose sixgill shark, Hexanchus griseus (Hexanchidae), was sighted. The estimated total length of this immature specimen was ∼146 cm. This is the first documented record of the species off Rapa Nui. The in situ evidence of this threatened deep-water shark highlights the urgency to build management strategies to protect vulnerable apex predators of coastal and deep-waters ecosystems of the recently created Rapa Nui Marine Protected Area for Multiple Uses, above all from the effects of fisheries and other human activities (e.g. bycatch, marine litter).
  • First record and distributional extension to Rapa Nui (Easter Island) of

    • Abstract: ABSTRACT A male specimen of the Aesop slipper lobster Scyllarides haanii was found in the coastal vicinity of Ahu Tongariki (27°07’33”S, 109°16’37”W), Rapa Nui. Its taxonomic determination was carried out by a detailed morphological examination and a DNA barcoding identification analysis by sequencing the cytochrome oxidase subunit 1 (COX1) gene. S. haanii has a wide geographic distribution with occasional presence from the Indo-Pacific to the Hawaiian Archipelago, including the Red Sea, Japan, Korea, China, Taiwan, Indonesia, Australia, Reunion, and French Polynesia; from 10 to 135 m of depth, preferably on rocky bottoms. This record extends the geographical distribution of S. haanii to Rapa Nui. It increases to five the species number of marine lobsters present on the island: a Palinuridae, Panulirus pascuensis and four Scyllaridae, Parribacus perlatus, Arctides regalis, Scyllarides roggevenni, and now S. haanii. This finding derived from the local initiative Pilotos to promote the sustainable management of coastal species, led by the Rapa Nui Sea Council (“Koro Nui o te Vaikava”), the elected authority in charge of the co-administration of Multiple Uses Marine Protected Area (MUMPA). The specimen will be deposited in the Crustacean Collection of the MNHNCL: accession number in GenBank (MW699539.1).
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762

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