Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

OCEANOGRAPHY (88 journals)

Showing 1 - 77 of 77 Journals sorted by number of followers
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 29)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Estuaries and Coasts     Hybrid Journal   (Followers: 23)
Limnology and Oceanography     Hybrid Journal   (Followers: 22)
Progress in Oceanography     Hybrid Journal   (Followers: 21)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 18)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 18)
Frontiers in Marine Science     Open Access   (Followers: 17)
Journal of Marine Sciences     Open Access   (Followers: 17)
Coastal Engineering     Hybrid Journal   (Followers: 15)
Advances in Oceanography and Limnology     Open Access   (Followers: 15)
Journal of Oceanography     Hybrid Journal   (Followers: 14)
Maritime Studies     Open Access   (Followers: 13)
International Journal of Oceanography     Open Access   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 11)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
Journal of Oceanography and Marine Science     Open Access   (Followers: 7)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 6)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 5)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 4)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Tropical Oceanography     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Acta Aquatica : Aquatic Sciences Journal     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
Similar Journals
Journal Cover
Thalassas : An International Journal of Marine Sciences
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0212-5919 - ISSN (Online) 2366-1674
Published by Springer-Verlag Homepage  [2467 journals]
  • On the Distribution of the Shallow Water Coral Coenocyathus Bowersi
           (Anthozoa: Scleractinia) in Chile

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      Abstract: Abstract New geographical records for the azooxanthellate ahermatypic scleractinian coral Coenocyathus bowersi Vaughan 1906, including the southernmost distribution record for the species, are presented based on colonies and fragments of colonies recovered by fishermen and commercial divers, as bycatch, from several locations at northern Chile, from Arica (18°28′ S; 70°19′ W), in the extreme northern limit of the country to Chañaral de Aceituno (29°04’ S; 71°29’ W), a high biodiversity area in northern Chile. These results confirm the presence of this species in Chile, ruling out accidental introductions, and they indicate that this species is apparently more common below some depth along northern Chile than previously known. It is thus possible that the current disjunct distribution of this species merely reflects lack of sampling efforts for C. bowersi (and similar invertebrates) along the south American coast from Panamá to S of Perú, where this species may be present in similar subtidal depths.
      PubDate: 2023-01-28
       
  • Thermal Tolerance of Juvenile New England Chain Catsharks, Scyliorhinus
           Retifer Garman, 1881 (Chondrichthyes, Carcharhiniformes, Scyliorhinidae)

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      Abstract: Abstract Our understanding of thermal ecology of elasmobranch fishes is grossly understudied. Currently, thermal niche requirements are known for only four elasmobranch species: Atlantic stingray, Hypanus sabina, (Fangue & Bennett 2003), Little skate, Leucoraja erinacea, (Stoler 2016), Blue-spotted ribbontail stingray, Taeniura lymma, (Dabruzzi et al. 2012), and Whitespotted bamboo shark, Chiloscyllium plagiosum, (Porter 2020). The purpose of our study was to use standardized Critical Thermal Methodology (CTM) to quantify thermal niche parameters of the chain catshark and quantify thermal niche requirements of juvenile Chain catsharks (Scyliorhinus retifer), from a New England population. The chain catshark is a small demersal species inhabiting the outer shelf, and upper slope waters in temperate regions from southern New England to Nicaragua. Our research compares catshark data to laboratory values from other elasmobranchs to bridge the knowledge gap surrounding elasmobranch thermal ecology. The data defined the upper and lower critical temperatures along the experimental acclimation range, as well as define the upper and lower thermal chronic limits (Becker and Genoway 1979; Beitinger and Bennett 2000). The Chain catshark data presented here is the first from an elasmobranch belonging to the family Scyliorhinidae.
      PubDate: 2023-01-18
       
  • Additions to the Morphology of the Cucumariidae. I. Intraspecific
           Variation of the Retractor Muscle in Parathyone braziliensis (Verrill,
           1868) and Thyonidium seguroensis (Deichmann, 1930) (Holothuroidea:
           Dendrochirotida)

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      Abstract: Abstract Intraspecific variation of the gross morphology of the retractor muscle was studied in 60 specimens of Parathyone braziliensis and 17 specimens of Thyonidium seguroensis. Specimens were dissected to expose the retractor muscle or were analyzed by micro-computed tomography. Early expectations that the point of origin of the retractor muscle at the longitudinal muscle relative to the midpoint of the body length was age-related and that the split of the retractor muscle into separate muscle bands could be used as taxonomic characters to separate species were not supported by anatomical evidence.
      PubDate: 2023-01-14
       
  • New Records of Three Species of Swimming Crabs (Decapoda, Brachyura,
           Portunidae) from the Maldives

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      Abstract: Abstract Three of portunid crabs – Thalamita chaptalii (Audouin, 1826), Thalamita picta Stimpson, 1858, and Thalamitoides quadridens A. Milne-Edwards, 1869 – are recorded for the first time from Maldivian waters during the current study. The important diagnostic features of these species are presented and an identification key for all Thalamita, Trierarchus and Thalamitoides currently reported from the Maldives is provided. The taxonomy of Thalamita admete Herbst, 1803, and Thranita exetastica Alcock, 1899, both also reported by Borradaile (1902) from the Maldives is discussed.
      PubDate: 2022-12-28
       
  • Some Observations on the Reproductive Biology of the Mediterranean
           Pennatulacean Pteroeides Spinosum (Ellis and Solander, 1786) (Cnidaria:
           Octocorallia: Pennatulacea)

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      Abstract: Abstract Sea pens are some of the most important structural species in soft bottom benthic communities. Pteroeides spinosum is a shallow-water pennatulacean (Cnidaria: Octocorallia: Pennatulacea) habiting NE Atlantic-Mediterranean bottoms. In this study, sixteen colonies of Pteroeides spinosum collected from NW Mediterranean Sea (Cap de Creus, Spain) at 99–106 m depth in July (2012), were used to acquire information of their reproductive biology, and to enable a comparison with other pennatulaceans. Our colonies of Pteroeides spinosum are gonochoric showing a bimodal oocyte frequency distribution and an unimodal spermatocyst diameter distribution. All polyp leaves contained oocytes and spermatocysts in different size classes, with those small and translucent spermatocysts/ oocytes (size-class I) often found near the base or lower end of the gastrovascular cavities of polyps. The largest observed diameter was 668 μm for spermatocysts and 687 μm for oocytes. Mean potential relative fecundity (PRF) ranged between 7–17 oocytes per polyp. The effective reproductive effort (ERE) reached a value of ca. 30,000 large oocytes per colony. As was observed for all pennatulaceans previously studied, no sign of hermaphroditism or internal fertilization was detected in our colonies of Pteroeides spinosum.
      PubDate: 2022-12-27
       
  • Morphological and molecular investigation of some xanthid crabs from the
           Egyptian coast of the Red Sea

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      Abstract: Abstract Family Xanthidae comprises 15 subfamilies and over 600 accepted species; they are represented well in the foreshore marine environments. Members of family Xanthidae are multi-colored crabs, usually inhabiting rocky coasts, coral reefs, and mud flats, all of which are well represented along the Egyptian coast of the Red Sea. Here, we utilized cytochrome oxidase subunit I (COI) sequences combined with morphology to provide information on some xanthid specimens collected from the Egyptian coast of the Red Sea. Six species within four genera (Leptodius, Etisus, Cyclodius, Chlorodiella) were collected. Genetic distances combined with morphological analyses showed intraspecific variations between two morphotypes of Leptodius exaratus. Two Etisus species were examined, E. laevimanus and E. sp. The latter Etisus sp. was close to E. frontalis, especially with regard to frontal lobe morphology, but different in male's first gonopod, with interspecific genetic distances. We also identified Chlorodiella nigra and C. laevissima. Obtained genetic distances between two morphotypes of Cyclodius granulatus revealed that these morphotypes are also likely cases of intraspecific variation. The results of this study should provide a basis for future work on family Xanthidae along the coasts of the Red Sea, which is needed as data remain scant.
      PubDate: 2022-12-27
       
  • Seasonal and Sexual Variations of Trace-Metal Elements (Cd, Pb, Cu, Zn,
           Fe) in Muscle and Eggs of the Deep-Water Pandalid Shrimp Plesionika
           edwardsii (Brandt 1851) from Northeast Algeria

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      Abstract: Abstract The level of trace metal elements (TME) (Cd, Pd, Cu, Zn, Fe) was determined according to the seasons and the sexes in the muscle and the eggs of the deep-water pandalid shrimp Plesionika edwardsii (Brandt in Reise in den aussersten Norden und Osten Sibiriens wahrend der Jahre 1843 und 1844 mit allerhochster Genehmigung auf Veranstaltung der Kaiserlichen Akademie der Wissenschaften zu St. Petersburgausgefuhrt und in Verbindung mit vielen Gelehrten herausgegeben 2(1):77–148, 1851) of the east coast of Algeria. Using the inductively coupled atomic plasma emission spectrometry method (ICP AES), the distribution of trace metals shows a significant fluctuation according to the seasons and the sex. Throughout the annual sampling, the order of heavy metal concentrations in female and male muscle, as well as in eggs were Cd < Cu < Fe < Zn < Pb, Cd < Cu < Zn < Pb < Fe, Cd < Cu < Fe < Zn < Pb respectively. In this work the heavy metal concentrations in target tissues are below the permissible limits set by the international standard except for Pb, mainly in summer, autumn and spring, exhibiting alarming levels.
      PubDate: 2022-12-17
       
  • Shoreline Change Along Raigarh Coast, Maharashtra- a Bi-decadal Scenario

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      Abstract: Abstract The dynamic nature of the shoreline makes the coastal areas vulnerable to the impacts of climate change and sea level rise. Changes in any shoreline concerning erosion and deposition affect the coastal landforms and population. Delineating the shoreline and mapping the areas of erosion/deposition would undoubtedly augment the knowledge base in the coastal region and help the environmental planners better maintain the coastal tracts. Shoreline delineation is challenging; however, remote sensing data combined with the Geoinformatics technique helps extract and monitor shorelines. The present paper attempts to delineate and analyze the shoreline changes over the bi-decade time frame for the coastal tracts of Raigarh. Satellite data (Landsat) and tide level data were employed in this work. Short-time shoreline change has been analyzed for five-time sections starting from 2000, 2004, 2008, 2012, 2016, and 2019, and long-term shoreline change encompasses the 2000 to 2019 scenario. The methodology adopted for this study involved image processing techniques for delineating the shoreline. The automated Shorelines were extracted using the Digital Shoreline Analysis System (DSAS) for the images prepared by employing a few indices using the ISODATA unsupervised classification technique. The present analysis results portray the Raigarh coast's dynamic nature. A cyclic pattern of erosion and deposition has been observed in the short-time analysis. Over twenty years, the Raigarh shoreline exhibits an overall erosion of -0.12 m/yr. A detailed analysis had done on the small section depicting mangrove patches, and this is to understand the response of mangroves at the zone of erosion and deposition. Mangrove patches with anthropogenic stress represent a zone of erosion, and patches with mature growth, protected from human interference, represent a zone of deposition. The mangrove patches, specifically over the northernmost parts like Kamothe, Khandeshwar, and Vaghivali, which are close to urban agglomeration or other allied anthropogenic activities like industry, exhibit an active erosion process. Mangrove patches with mature trees have well-developed root systems representing the deposition zone. Navedarbeli well represents such cases. Patches like Kalinje reported deposition, which is the result of a successful conservation program by the mangrove cell of Maharashtra. Overall, the headland regions of Alibag, Murud, and Srivardhan talukas are more susceptible to erosion. This type of study will help in monitoring the shoreline as well as will help in restoring and preserving the mangrove habitat.
      PubDate: 2022-12-14
       
  • Assessment of Heavy Metals in Deep-water Fish the Greater Forkbeard Phycis
           blennoides from Algerian Commercial Fisheries

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      Abstract: Abstract The aim of this study was to assess heavy metals in liver and muscle tissues of the greater forkbeard, Phycis blennoides from Algerian commercial fisheries. Specimens of this deep-water fish were sampled from seven ports (i.e. Annaba, Azeffoun, Zemmouri, Bouharoun, La Madrague, Cherchell and Mostaganem) along the Algerian coast, between April 2014 and May 2015. Five heavy metals (Pb, Cu, Zn, Ag, Ni) were evaluated in 43 samples (28 muscle and 15 tissues livers) belonging to 30 individuals of P. blennoides. Their total lengths (TL) varied between 12.2 and 54.5 cm and weighting from 11.22 to 1334.11 g in total weight (TW). The analysis was performed using Flameless Atomic Absorption Spectrophotometry (FAAS), after dry and wet acid digestions. Ontogenetic, sexual, spatial and bathymetric variations of heavy metal concentrations were studied. Their presence in both anatomical territories were observed in this species. Muscle presented highs mean values of Ag, Ni and Zn and highs levels of Pb and Cu in the liver. Significant variations (p < 0.05) were noted across sex, size categories, sectors, regions, but not with depths (p > 0.05). This work is the first to assess heavy metals by FAAS in P. blennoides of the Southwestern Mediterranean, and the only one that determines silver concentrations in deep-fish organs from Africa.
      PubDate: 2022-12-06
       
  • Comparison of Two Stereo-Video Software for the Assessment of Marine
           Resources

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      Abstract: Abstract In the last two decades underwater stereo-video analyses have received interest for use in diversity, abundance, and biomass estimations for marine species because of their low-cost, time-efficient and as a not invasive technique. Here, we assessed the accuracy and precision of measurements from two videogrammetric software (VidSync and EventMeasure by SeaGIS) from a Baited Remote Underwater Stereo-Video system (Stereo-BRUVs) for determining the size of objects of known length under controlled conditions and lengths of pelagic fish in open ocean conditions. One Stereo-BRUVs equipped with GoPro cameras was employed to take measurements of known-length rods in a pool to compare the influence of size, distance to rod and angle to the optical axis on measurement accuracy and precision. The ability to estimate fish length in open waters was tested by measuring 14 individuals of the common dolphinfish (Coryphaena hippurus) with the same Stereo-BRUVs equipment simultaneously calibrated for both software. The pool test showed that SeaGIS measurements (error = 0.22%) were more accurate than VidSync (error = 0.63%) only for the shortest rod. For both software, accuracy remained high (> 99%) and did not decrease regardless the size, distance, and angle of the measured rods. The open waters measurements showed high correlation (R2 = 0.99) between VidSync and SeaGIS for the common dolphinfish, suggesting that both software take similar measurements of individual fish. We suggest both software make length estimations with great accuracy and precision.
      PubDate: 2022-12-06
       
  • Rare Record of Lavender Jobfish, Pristipomoides sieboldii (Bleeker, 1855)
           from the Southwest Coast of India with Detailed Taxonomic Description

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      Abstract: Abstract The lavender jobfish, Pristipomoides sieboldii (Bleeker, 1855) was recently recorded from the southeastern Arabian Sea, based on a single specimen collected from trawl net fishery off Kollam, Southwest coast of India, representing a rare occurrence. The specimen was identified based on morphometric and meristic characters. The presence of a diamond-shaped tooth patch on the vomer with medial posterior extension, a heart-shaped villiform tooth patch on the tongue and scales on the cleithrum are the key identification characters of this species. The distinguishing meristic characters include pored lateral line scale count of 73 and gill raker count on lower limb of the first arch (including rudiments) of 20. The present report provides complete taxonomic description of the specimen from Indian waters for the first time and also contributes towards a better understanding of the regional diversity of snappers along the Southwest coast of India.
      PubDate: 2022-12-02
       
  • Effect of Diffracted Waves on Harbor Resonance

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      Abstract: Abstract Wave exposure and disturbance are important factors in harbor design. The diffracted waves affect the harbor resonance. The wave model RIDE was applied to study the harbor resonance characteristics. The model predictions were compared with the results of two physical experiments and previous numerical studies. Twelve cases were studied for eight different layouts. The wave model RIDE was applied to the port of Filyos and the fishing port of Kilimli on the western Black Sea coast of Turkey. Comparisons between numerical simulations for different layouts and wave conditions showed that the amplification of wave height in the basin could be significantly reduced for resonant modes by diffracting the waves.
      PubDate: 2022-11-26
       
  • Rare Occurrence of a Partially Ambicoloured Flatfish, Brachirus orientalis
           (Bloch & Schneider, 1801), from Kerala, South West Coast of India

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      Abstract: Abstract Ambicolouration is an abnormality which occurs as pigmentation in certain areas of the fish. The present study documents the occurrence of partial ambicolouration in Oriental sole, Brachirus orientalis (Bloch and Schneider 1801) collected from central Kerala. The ambicolouration was observed around 38% in the blind side of the fish similar to the colouration in the ocular side restricted to the caudal area which is extended anteriorly to the dorsal and anal fins. Meristic characters did not reveal any significant variation with the normal fish. No visible abnormalities in vertebrae were noticed in the ambicoloured fish.
      PubDate: 2022-11-24
       
  • First Report of Stranded By-the-wind Sailor from Coastal Areas of Andaman
           and Nicobar Islands

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      Abstract: Abstract The free-floating anthoathecate hydrozoan species Velella velella (Linnaeus 1758) is commonly known as by-the-wind sailor. The typical morphological feature of this species denotes a sail-like structure above the sea surface, provides the major physical attribute to this species related to its drift or navigation across the tropical and temperate warm waters. During the present study, stranding of V. velella with northwest to southeast directive sail is reported from the sandy coast of Great Nicobar Island for the first time.
      PubDate: 2022-11-23
       
  • Age and Growth Studies in Indian Oil Sardine (Sardinella longiceps) using
           Hard Part Microstructure, a Tool for Biological and Ecological
           Understanding

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      Abstract: Abstract Age and growth characteristics of the Indian oil sardine (Sardinella longiceps) was studied by interpreting microstructures on hard parts. Microstructures were validated to the time scales by observing their frequency of formation on hard parts of the fishes reared in confinement. Among the hard parts, sagittal otolith alone was found suitable for ageing the species as frequency of microstructure formation on them followed definite time scale. The estimates of age at length data and growth parameters from otolith analysis indicated faster growth in the species than the earlier estimates by other methods. Despite an expected sexual divergence in their growth, results show identical growth in both sexes. It further highlighted the prevalence of very distinct temporal growth variation driven by habitat environment indicating significance of hard part studies on ecological understanding of fishes. It also aided in tracing the precise time of birth with high precision, identifying the cohorts that supported the fishery and possible inter-regional migration of the species. The data generated from hard part ageing would aid in better eco-biological understanding of species, precise stock assessment outputs and fishery forecasting.
      PubDate: 2022-11-23
       
  • Spawning, Embryonic and Larval Development of the Mangrove Goby
           Mugilogobius Cavifrons (Gobiidae) Reared in Captivity

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      Abstract: Abstract The spawning, embryonic and larval development of Mugilogobius cavifrons were described for the first time to improve the knowledge of reproductive biology and the taxonomic identification at the early stages of Mugilogobius sp. The male only mated with one female. The spawning occurs at 14:00–16:00. The eggs were attached to the PVC pipe in a single layer. Fecundity ranges from 1023 to 7280 eggs per spawning event. The spawning interval was 2–9 days. The fertilized eggs measured 1.16–1.39 × 0.50–0.57 mm, were ellipsoid with an attached filament, and demersal. Hatching occurred 60 h 33 min after fertilization at 24.4 ± 0.2 °C. Newly hatched larvae were 2.29 mm in total length (TL) with 25–26 myomeres. The maxilla and mandible were functional but not fully developed. The larvae presented numerous stellate melanophores on the ventral contour of the body and ventral-abdominal gut. Nine days post hatching (DPH, 4.19 mm TL), the mouth was completely differentiated. At 4.73 mm TL, the soft rays of the dorsal and anal fins had begun to develop. At 5.60 mm TL, the notochord end flexion was completed. At 7.90 mm TL, the number of fin spines and soft rays was that found in adults. By 45 DPH, at 20.77 mm TL, vertical black stripes appeared on the head, body, dorsal fins, anal fin, and caudal fin. The metamorphosis was complete.
      PubDate: 2022-11-21
       
  • A Comprehensive Study on Mass Culture of Gracilaria edulis in Coastal
           Waters of South Andaman: Criterion, Constraints and Possibilities

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      Abstract: Abstract This study explores the possibilities of converting the largely underutilized potential coastlines of Andaman Island to profitable seaweed farming sites, particularly at South Andaman. Present study, surveyed a total of five stations to locate the best possible site for seaweed mass production, of which two locations were selected based on geomorphology, water quality parameters and ease of access. The pilot scale study was done from 2018 – 2021 to understand the feasibility of seaweed farming in this Island. The first culture initiation was done at North Bay using Gracilaria edulis (G. edulis) and Acanthophora spicifera (A. spicifera) in floating bamboo raft. Seaweeds were tied using two different methods i.e.direct insertion to ropes and pouch filling. The results suggested that pouch filling method not only increases the yield but also lowers wash out occurrences in rough sea. The G. edulis species was found to grow well in the bamboo rafts with DGR of approximately 135 gm (± 0.085gm)/Kg. About 155–180 kg of G.edulis were harvested from 7 raft seasonally with 17.5 kg of input biomass, in this trial study. The main challenges experienced during the trial were, seasonality of preferable seed material, prolonged rainy seasons, cyclonic events, wave action and turbidity due to sedimentation, fouling by undesirable algae. Even so, the prospects of extensive development of seaweed culture in these islands are high, provided, steady seed availability, selection of season, proper culture technique and practices are considered and applied.
      PubDate: 2022-11-21
       
  • Report of the Red-Toothed Triggerfish Odonus niger (Rüppell, 1836)
           from the North-East Region of the Arabian Gulf

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      Abstract: Abstract A new record of the Red-toothed triggerfish Odonus niger from the northeast region of the Arabian Gulf is reported. The three specimens of O. niger were obtained from a fish market in Khorramshahr City, south of Iran, on 10th December 2021. The sampling done during routine sampling in the northern part of the Arabian Gulf represents a significant contribution to the fish diversity in this part of the world as this species has been reported from the Arabian Gulf from Iraq before but has not been reported in the coastal waters of Iran. Reasons for the presence of this species in its new environments were given and discussed.
      PubDate: 2022-11-14
      DOI: 10.1007/s41208-022-00500-x
       
  • Stramonita Genus Exhibits a New Uncovered Species: A Cryptic Species
           Collected from Accra, Ghana (Eastern Atlantic Ocean)

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      Abstract: Abstract Several cryptic (new) species were recently identified based on molecular data. Phylogenetic analyses of Stramonita haemastoma complex have recognized new species and cryptic lineages. In the present study, we recorded of the first time the occurrence of a new species from a rocky shore located in Accra, Ghana, Eastern Atlantic Ocean. Individuals from Accra, Ghana (Eastern Atlantic Ocean) were firstly identified as S. haemastoma based on morphological criteria. The colour pattern of the aperture and the number of crenulations were examined from the identification of Ghanaian species, moreover comparison with S. haemastoma shell features was conducted. Molecular analysis of the mitochondrial DNA COI sequence of specimens from Ghana showed a strong divergence from Stramonita haemastoma species, this finding was proved by statistical analysis. Overall, the mean genetic distance calculated between S. haemastoma and Ghanaian population is high 10%. The genetic distance measured between Ghanaian Stramonita and other species of the Stramonita haemastoma complex were ranged from 4% S. brasiliensis and 12% S. canaliculata. Specimens from Ghana represent a new species of Stramonita not yet described in Accra coast, Ghana, Eastern Atlantic.
      PubDate: 2022-11-11
      DOI: 10.1007/s41208-022-00506-5
       
  • Length-Girth Relations of Five Sparid Fishes off Gökçeada Island,
           Northern Aegean Sea, Turkey

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      Abstract: Abstract This study was carried out in order to explore the relations between opercular girth (Gope), maximum girth (Gmax) and total length (TL) for five sparid fishes [Pagellus acarne Risso, 1827, Pagellus bogaraveo Brünnich, 1768, Pagellus erythrinus Linnaeus, 1758, Sarpa salpa Linnaeus, 1758, and Spondyliosoma cantharus Linnaeus, 1758] in family sparidae. The samples were obtained during January 2014 to December 2016 with the aid of commercial fishermen off Gökçeada Island (Northern Aegean Sea, Turkey). The linear regression of opercular girth and maximum girth with the total length were calculated for each species. Gope and Gmax were found to increase linearly with total length for all sparids. The mean ± standard error (and range) of total length were 16.5 ± 0.24 (15.0–23.8) cm, 15.0 ± 0.15 (14.0–17.7) cm, 18.1 ± 0.38 (15.0–21.5) cm, 28.1 ± 0.51 (20.3–32.0) cm and 24.9 ± 0.79 (19.7–31.7) cm for Pagellus acarne, Pagellus bogaraveo, Pagellus erythrinus, Sarpa salpa and Spondyliosoma cantharus, respectively. However, the opercular girth-length relations were calculated as Gope = 0.6190TL–1.0964 (r²=0.95), Gope = 0.9499TL–4.8657 (r²=0.85), Gope = 0.8453TL–3.7876 (r²=0.89), Gope = 0.4286TL + 3.0323 (r²=0.87), Gope = 0.8329TL–1.5604 (r²=0.96), whereas the maximum girth-length relations were determined as Gmax = 0.6643TL–0.9501 (r²=0.93), Gmax = 1.0017TL–4.6680 (r²=0.90), Gmax = 0.8714TL–2.9893 (r²=0.88), Gmax = 0.4463TL + 5.2661 (r²=0.80), Gmax = 0.8088TL + 1.3091 (r²=0.91) for Pagellus acarne, Pagellus bogaraveo, Pagellus erythrinus, Sarpa salpa and Spondyliosoma cantharus, respectively. The present research comprises the first findings about length-girth relations (LGRs) of Spondyliosoma cantharus for the northern Aegean Sea, whereas, no LGRs estimates of Sarpa salpa have beforehand been reported worldwide. Because these findings are important for the selectivity of fishing gear so as to prevent the capture of younger and/or undersized individuals, it will contribute to the development of ecosystem-based fisheries management.
      PubDate: 2022-11-10
      DOI: 10.1007/s41208-022-00508-3
       
 
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