Assessment of changes in the cephalopod species composition in landings off Visakhapatnam coast, Andhra Pradesh

Laxmilatha, P and Kuriakose, Somy and Rao, M Prasada and Pattnaik, Phalguni (2021) Assessment of changes in the cephalopod species composition in landings off Visakhapatnam coast, Andhra Pradesh. Marine Fisheries Information Service, Technical and Extension Series, 250. pp. 21-22. ISSN 0254-380X

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Abstract

Cephalopods are landed by the large trawlers (12-14 OAL (Overall Length), 98/110 hp), known as sona boats and the smaller trawlers (9.5-10 OAL, 68/90 hp). Time series data with respect to catch, catch rate and species composition of cephalopods (cuttlefish and squids) off Visakhapatnam coast for the period 1998- 2010 were analysed. The Markov chain model was used to assess the species dominance to understand the changes and predict the dominance order of different species of cephalopods.Monthly and annual data on the effort and total cephalopod landings by the trawlers based at Visakhapatnam Fisheries Harbour collected by ICAR -CMFRI through a stratified multi-stage random sampling method was used. For estimation of species composition, weekly samples collected during the period were analyzed and appropriately weighted to arrive at monthly and annual landings.

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