Indian Council of Agricultural Research
CENTRAL MARINE FISHERIES RESEARCH INSTITUTE

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Ecopath modelling approach for the impact assessment of a small-scale coastal aquaculture system in Goa

In this study, the ecological impacts of introduction of cage aquaculture employing small cages integrating shellfish and finfish in coastal water bodies of Goa, situated in the west coast of India were analysed using Ecopath with Ecosim model. A multispecies cage aquaculture system incorporating Lutjanus argentimaculatus, Etroplus suratensis and Perna viridis was established in an estuarine ecosystem


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Women SHGs in the Midst of Covid 19 Pandemic: A Cautionary Glimpse on a Transition in Kerala Fisheries

A study was conducted on the impact of Covid 19 pandemic among selected microenterprises of women’s Self Help Groups (SHGs) in marine fisheries sector in Kerala State. Their level of performance and extent of empowerment were assessed through appropriate indices of measurement based on the data from SHGs of 16 different conspicuous fishery based micro enterprises in Kerala state. The gender analysis and economic feasibility analysis based on personal interview and focus group interaction meetings with members of SHGs were undertaken. The male and female counterparts of the families of respondents were separately interviewed to assess the gender mainstreaming impact in terms of equity and equality to access and control over the resources, participation profile, decision making, gender need analysis etc.


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Pseudanthias vizagensis, a junior synonym of Pseudanthias pillai Heemstra & Akhilesh, 2012 (Perciformes: Serranidae)

Pseudanthias vizagensis Krishna, Rao and Venu, 2017 was described from 44 specimens, collected from Visakhapatnam (Andhra Pradesh), on the Bay of Bengal coast of India, but without clear designation of a holotype. The characters used for differentiating the species from its nearest congener Pseudanthias pillai Heemstra & Akhilesh, 2012, a species currently known only from the northern Indian Ocean, were limited, poor and substantially overlapping. Examination of additional material of P. pillai from the Arabian Sea, Bay of Bengal, Andaman Sea, and comparison with the original description and images of P. vizagensis revealed that the latter is a junior synonym of P. pillai. Diagnostic characters are reviewed, additional morphological details and fresh colouration, including sexual dimorphic characters not covered in previous works are provided.


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Feeding ecology of deep-water Arabian red shrimp, Aristeus alcocki Ramadan, 1938 from southwestern India

The Arabian red shrimp, Aristeus alcocki Ramadan, 1938 constitutes a commercially important decapod in the southern coast of India with an annual average catch of greater than 2,122 tons. The diet contents in connection to the sex, maturity, season and size group of this species were investigated using an aggregate number of 634 samples collected from the south-west coast of India. The diet components of A. alcocki were deduced to consist of 71 prey categories, which belonged to smaller crustaceans (e.g. amphipods, decapods, euphausiids), foraminiferans (Rotaliida, and Miliolida), molluscs (bivalves, gastropods, and cephalopods), polychaetes, and bryozoans. Feeding pattern of the studied species was examined using Amundsen graphical method, which recognized that A. alcocki exhibited different degrees of generalization and specialization with various preys. The marginal seasonal variation related to major prey items could be attributed to the environmental fluctuations of the deep waters and other biological processes. Considering stomach fullness and food quality, the females of A. alcocki were found to be the effective predators than males. The parameters, such as population characteristics, somatic and gonadal development might be attributed to this variation. Notably, the larger-sized animal have good swimming ability, which could help in an effective selection of prey, while the smaller individuals depend on the epibenthic organisms for their food. This study comprises the first report on the feeding biology of A. alcocki in the Arabian Sea.


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Signals of adaptive mitogenomic evolution in an indigenous Cichlid, Etroplus suratensis from India

Etroplus suratensis is one of the most important indigenous Cichlids of the Indian subcontinent exhibiting restricted distribution in the estuaries of peninsular India and Sri Lanka. Coastal pollution and climate change contribute to the deterioration of their habitats. Etroplus suratensis is widely distributed along estuaries and brackishwater lakes of India which make them ideal candidates for investigations on adaptation and selection on mitochondrial Oxidative Phosphorylation (OXPHOS) genes. We investigated the selection patterns in the OXPHOS system of E. suratensis by comparing OXPHOS genes of 105 fishes collected from different eco-regions in India. Signals of positive and diversifying selection observed in the mitogenomes were correlated with habitat characteristics. Habitat specific mutational signals observed have adaptive significance as the populations of the study represented humid tropical climatic zones constituting rainforests in the southwest, semi-arid zones in the southeast and humid subtropical zones in the northeast regions of India. Adaptation to these environmentally heterogeneous habitats generates genotypic and phenotypic variants with specific metabolic or bioenergetic requirements. The observed adaptive mitogenome evolution may be the imprints of this geographic variability, genetic drift and selective forces imparted by the distinctive ecoregions which form their habitats.

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Epigonus indicus, a new species of deepwater cardinalfish (Perciformes: Epigonidae) from the Indian Ocean

A new species of deepwater cardinalfish, Epigonus indicus, is described from two specimens, 105.2 and 100.2 mm SL, from Kavaratti Island, Lakshadweep (Laccadive) Sea, India. The specimens were collected from storage tanks at a desalination plant where seawater was piped up from 350–400 m depths. Diagnostic features distinguishing the new species from congeners include no pungent opercular spines, no maxillary mustache-like process, no projections on the symphysis of the lower jaw, ribs absent on the last abdominal vertebra, no isolated dorsal-fin spine between the first and second dorsal fins, gill rakers 26–27, pectoral-fin rays 15–17, pectoral-fin length about 22–23% SL, and body depth about 28–29% SL.


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