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Food habits of the blue swimmer crab, Portunus pelagicus were investigated using specimens collected from trawl catches in the Mandapam region, Tamil Nadu, along the east coast of India (9°20-25′N 79°5-10′E), during the period January to December, 1999. The stomach contents of 452 crabs, ranging from 61 to 180 mm carapace width, were analysed. Their diet included crustaceans, molluscs, fishes, unidentifiable matter, and debris. In adult crabs, crustaceans constituted the dominant food source and these were present in 78.43% of the stomachs analysed. The stomach contents of juveniles and sub-adults were dominated by debris. There was no significant difference between sexes in the frequency of occurrence of food items or in their "percentage points" [= the (virtual) percentual contribution to the fullness of a 100% full stomach]. However, there was a difference between the stomachs of ovigerous and non-ovigerous females. There were also significant differences in the preference for food items in the different size groups of the crab. The results collected from the present study showed that P. pelagicus exhibits, in this region at least, a clear preference for crustaceans. © 2011 Koninklijke Brill NV, Leiden.

Gopinadha Pillai C.S.,Central Marine Fisheries Research Institute
Indian Journal of Animal Sciences | Year: 2010

Precise estimation of the biodiversity of corals from any area is subject to variation due to uncertainty of synonymy. Corals exhibit very high intraspecific skeletal variation depending on the physiographic and hydrographic condition. The present paper describes overview of coral resources in Indian seas, their biology and taxonomy, anthropogenic stress on coral reefs, conservation and research efforts being put by various organisations.

Rajesh N.,Central Institute of Fisheries Education | Imelda-Joseph,Central Marine Fisheries Research Institute | Paul Raj R.,Coastal Aquaculture Authority
Waste Management | Year: 2010

Vegetable waste typically has high moisture content and high levels of protein, vitamins and minerals. Its value as an agricultural feed can be enhanced through solid-state fermentation (SSF). Two experiments were conducted to evaluate the nutritional status of the products derived by SSF of a mixture of dried vegetable waste powder and oil cake mixture (soybean flour, wheat flour, groundnut oil cake and sesame oil cake at 4:3:2:1 ratio) using fungi Aspergillus niger S14, a mangrove isolate, and A. niger NCIM 616. Fermentation was carried out for 9days at 35% moisture level and neutral pH. Significant (p<0.05) increase in crude protein and amino acids were obtained in both the trials. The crude fat and crude fibre content showed significant reduction at the end of fermentation. Nitrogen free extract (NFE) showed a gradual decrease during the fermentation process. The results of the study suggest that the fermented product obtained on days 6 and 9 in case of A. niger S14 and A. niger NCIM 616 respectively contained the highest levels of crude protein. © 2010 Elsevier Ltd.

In this study, the interrelationships between various morphometric characters, viz., carapace width and length and chelar propodus length and height in males, as well as carapace width and length and abdominal width and length in females, were estimated using a total of 980 crabs, Portunus pelagicus. The carapace width/length - weight relationship was studied in both sexes on a total of 1188 crabs using the allometric growth equation of Von Bertalanffy. The allometric relationships between the characters of this set suggest that most relationships are positive and highly significant. The 'b' values for carapace width-weight in males and females were 3.607 and 3.293, respectively, and for carapace length-weight they were 3.049 and 2.774, respectively. The results show a significant deviation from an isometric growth pattern. An analysis of covariance indicates that there is a significant difference between sexes with respect to the carapace width-weight relationship.© Koninklijke Brill NV, Leiden, 2011.

Filtration rate and ingestion rate of different stages of Paphia malabarica larvae (D-shape, (80μm), Umbo (120μm) and veliger (180μm)) were determined in relation to feeding on various micro algae. The micro algae tested were Nannochloropsis salina, Isochrysis aff. galbana, Dicrateria inornata, Tetraselmis gracilis and Chaetoceros calcitrans at 5 or 10×103cellsmL-1. Both filtration and ingestion rate of micro algae tested were increased with increasing larval size; however, at all larval stages, C. calcitrans resulted in lower filtration and ingestion rate. Of the algal diets tested, P. malabarica larvae showed greatest filtration rate and ingestion rate with N. salina. Maximum filtration rate for N. salina was 15.7, 26.3 and 33.9μLh-1 and highest ingest rate was 15, 92 and 177cellslarva-1h-1 in D shape larvae, umbo and pediveliger, respectively. Filtration rate and ingestion rate of N. salina were always higher than those other algal species tested because of its small cell size (2μm). © 2010 Blackwell Publishing Ltd.

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