Summary of Abstract Submission

Abstract Submission No. IO50-09-0060PresentationPoster

SPECIES COMPOSITION ANDDEPTH WISE DISTRIBUTION OF DEEP SEA FAUNA AROUND INDIAN EEZ OF ANDAMAN AND NICOBAR ISLANDS

S. Venu*1, Ravi Ranjan Kumar1

1 DOSMB, Pondicherry University, India

ABSTRACT :

Data collected during October 2013 to April 2015 from commercial deep sea bottom trawler MV Periyar and FORV Sagar Sampada (Cruise 334 leg-I) at depths ranging from 150-1000m in the waters around the Andaman Islands (Fig. 1) using standard commercial bottom trawl (HR length 33 m) and the High Opening Trawl net was used for the present study. Among 119 species recorded, Fin fishes (65%) dominated followed by crustaceans (21%), Elasmobranchs(6.5%), echinoderms (5.5%). The least were molluscs 1.5%, sponges 0.5%, and miscellaneous fauna formed0.16%. The maximum number of species was recorded from Lat 110-120 in 501- 1000 m depth (62), followed by 150-300 m depth (50) and least in 301-500 m depth (35). In Latitude 120-130N, 56 species could be recorded from the depth of 301-500 meters. Cubiceps sp.(17.56%) dominatedfollowed by Bembropscaudimaculata 8.09%,Haleleutea sp.7.89%, Benthodytes sp. 6.15%, Chlorophthalmusnigromarginatus 4.11%, Neoscopelusmicrochir 3.1%, Bembrops sp. 3.17%, Ateleopus sp. 2.56%, andAlepocephalus sp. 1.30% of finfishes group followed by other 5.96% of Homala sp. from crustaceans group. Elasmobranchs was also important group contributed after crustacean for the speciesEridacnisradcliffei1.86% followed by 1.02% Bythaelurushispidus.It is interesting that sea urchins and sea anemones also contributed with 0.03% of species composition. Very less presence was recorded from other groups like Tydemania sp.,Stomiformes, Spiny crab, Soldier shrimp, Squalus sp., Setarches sp., Ruvettuspretiosus, Rexea sp., Pterigotryglahemisticta, Pirula sp., Osrtacoberyxdorigenis, Nemichthys sp., Lagocephalus sp., Heterocarpusgibbossus, Glyphus sp., Gempylussp., Dentalium sp., Creatias sp., Bregmaceros sp., Bathynomus sp., Thyrsitoides sp.Atrocalystus sp. and Aplysia spp.