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Observations on the trophodynamics of sawtooth barracuda, Sphyraena putnamae from the Bay of Bengal, northern Indian Ocean

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Relation http://eprints.cmfri.org.in/15699/
https://www.cambridge.org/core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom/article/abs/observations-on-the-trophodynamics-of-sawtooth-barracuda-sphyraena-putnamae-from-the-bay-of-bengal-northern-indian-ocean/CE2156A54539DF2CA3A5757ACF87FBB6
doi.org/10.1017/S0025315421000886
 
Title Observations on the trophodynamics of sawtooth barracuda, Sphyraena putnamae from the Bay of Bengal, northern Indian Ocean
 
Creator Ghosh, Shubhadeep
Manas, H M
Rohit, Prathibha
Satishkumar, Mamidi
Median, A E
Gopalakrishnan, A
 
Subject Demersal Fishes
Demersal Fisheries
 
Description Marine capture of Sphyraena putnamae along western Bay of Bengal has been increasing.Owing to scarcity of information available on feeding dynamics globally, the present study
was conducted using 763 individuals captured during 2017–19, to decipher trophic ecologyand relationships. Of the individuals analysed, 54.8% had their stomachs either empty or with trace amounts of food, 27.3% had part-full stomachs and 18.0% had full stomachs. Stomach vacuity and fullness as well as predator–prey weight ratio varied with increase in
body size, implying higher feeding intensity in large-sized fishes. Feeding activity was highest during July–November and lowest during March–April. The species is an opportunistic piscivorous pelagic predator that feeds on teleosts (>85%) and cephalopods. Sardines were the major prey, followed by whitebait, squid, bigeye scad, Indian scad, silverbellies and Indian mackerel. Diet contents were similar between sexes (82.17%); however, it varied among seasons (56.86–69.85%). Shifts in prey preferences from sardines, squid and bigeye scad to ribbonfish, shad, grunter, Indian mackerel, horse mackerel and Acetes were observed with increase in fish size, and diet varied between individuals sized 60.0 cm. Trophic level value was 3.51 ± 0.13 and Levin’s Standardized Niche Breadth Index was 0.21. Dietary niche breadth varied across seasons and sizes, with higher values during summer and winter (0.36–0.41) and in fish measuring >45.0 cm (0.50–0.68), which implies generalized feeding behaviour. The present study represents the first detailed report on the diet of S. putnamae and will provide a substantial contribution to stock management through understanding of trophic interactions.
 
Date 2022
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/15699/1/Journal%20of%20the%20Marine%20Biological%20Association%20of%20the%20United%20Kingdom_2022_Shubhadeep%20Ghosh.pdf
Ghosh, Shubhadeep and Manas, H M and Rohit, Prathibha and Satishkumar, Mamidi and Median, A E and Gopalakrishnan, A (2022) Observations on the trophodynamics of sawtooth barracuda, Sphyraena putnamae from the Bay of Bengal, northern Indian Ocean. Journal of the Marine Biological Association of the United Kingdom. pp. 1-13.