Thomas, Sujitha and Muktha, M and Dash, Swatipriyanka Sen and Kizhakudan, Shoba Joe and Akhilesh, K V and Purushottama, G B and Mahesh, V and Rahangdale, Shikha and Zacharia, P U and Najmudeen, T M and Manojkumar, P P and Remya, L and Wilson, Livi and Roul, Subal Kumar and Pradhan, Rajesh Kumar and Seetha, P K and Yousuf, K S S M and Nataraja, G D (2021) Status of the hammerhead shark (Carcharhiniformes: Sphyrnidae) fishery in Indian waters with observations on the biology of scalloped hammerhead Sphyrna lewini (Griffith & Smith, 1834). Aquatic Conservation : Marine and Freshwater Ecosystems. pp. 1-15.
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Abstract
Hammerhead sharks are represented by four species in India's marine fishery – Sphyrna lewini, Sphyrna mokarran, Sphyrna zygaena and Eusphyra blochii. This paper describes the hammerhead shark fishery in India during 2007–2018 and summarizes observations on the biology of S. lewini exploited along the Indian coast. Hammerhead sharks are caught by trawl nets, gillnets, seines and line gear, mostly as bycatch. Annual average landing of hammerhead sharks during 2007–18 was 639 t, with a low of 290 t in 2018, of which S, lewini was the dominant species, comprising 95% of landings. Hammerhead sharks formed nearly 1.31% of the total elasmobranch landings. About 54% of hammerhead sharks were landed by trawlers. Length range of S. lewini in regular landings was 36–300 cm total length (TL). The dominant size class was 30–100 cm TL; 79.5% of males and 83.2% of females measured between 40 and 100 cm TL. Length–weight relationship was derived as W = 0.0218*(L)2.634 and W = 0.0131*(L)2.769 for males and females, respectively. Overall sex ratio (F: M) was 1.3:1; below 100 cm TL, the sex ratio was skewed in favour of females. The length at first maturity of males was estimated as 168 cm. The length at first maturity of females was estimated at 239.6 cm. Fecundity ranged from 12–40, size at birth was 36–45 cm TL. Bony fishes were the preferred prey, followed by cephalopods.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | biology, conservation fishery, elasmobranchs, juvenile sharks, tropics |
| Subjects: | Demersal Fisheries > Shark fisheries Fishery Biology Demersal Fisheries |
| Divisions: | CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division CMFRI-Kochi > Marine Capture > Demersal Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Demersal Fisheries Division |
| Depositing User: | Arun Surendran |
| Date Deposited: | 08 Sep 2021 08:51 |
| Last Modified: | 18 Sep 2021 06:15 |
| URI: | http://eprints.cmfri.org.in/id/eprint/15273 |
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