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Status of the hammerhead shark (Carcharhiniformes: Sphyrnidae) fishery in Indian waters with observations on the biology of scalloped hammerhead Sphyrna lewini (Griffith & Smith, 1834)

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Relation http://eprints.cmfri.org.in/15273/
https://onlinelibrary.wiley.com/doi/abs/10.1002/aqc.3686
https://doi.org/10.1002/aqc.3686
 
Title Status of the hammerhead shark (Carcharhiniformes: Sphyrnidae) fishery in Indian waters with observations on the biology of scalloped hammerhead Sphyrna lewini (Griffith & Smith, 1834)
 
Creator Thomas, Sujitha
Muktha, M
Dash, Swatipriyanka Sen
Kizhakudan, Shoba Joe
Akhilesh, K V
Purushottama, G B
Mahesh, V
Rahangdale, Shikha
Zacharia, P U
Najmudeen, T M
Manojkumar, P P
Remya, L
Wilson, Livi
Roul, Subal Kumar
Pradhan, Rajesh Kumar
Seetha, P K
Yousuf, K S S M
Nataraja, G D
 
Subject Shark fisheries
Fishery Biology
Demersal Fisheries
 
Description 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.
 
Publisher Wiley
 
Date 2021
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/15273/1/Aquatic%20Conservation%20Marine%20and%20Freshwater%20Ecosystems_2021_Sujitha%20Thomas.pdf
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.