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Investigations on fishery and biology of nine species of rays in Mumbai waters

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Relation http://eprints.cmfri.org.in/5892/
 
Title Investigations on fishery and biology of nine species of rays in Mumbai
waters
 
Creator Raje, S G
Zacharia, P U
 
Subject Fishery biology
Ray fisheries
 
Description Annual landings of rays by trawlers operating from New Ferry Wharf, Mumbai during 1990-2004 ranged from 205.7 t to
765.1 t with an average of 502.8 t constituting nearly 1 % of trawl catches. The trawling effort increased from 0.95 million
hours (mh) in 1990 to 1.73 mh in 2004, whereas the catch rate declined from 0.65 kg h-1 in 1990 to 0.24 kg h-1 in 2004.
There were two peak periods of abundance, September-December and February-April. Fourteen species of rays constituted
the fishery, of which Himantura alcockii (50.1 %), Himantura bleekari (13.9 %), Amphotistius imbricatus (8.5 %) and
Himantura uarnak (8.1 %) formed the mainstay of the fishery. Information on biology of H. alcockii, H. bleekeri,
A. imbricatus, Pastinacus sephen, Dasyatis zugei, Gymnura japonica, G. poecilura and Mobula diabolus is also presented.
It appears that the resource of rays off Mumbai may not be able to withstand any further increase in fishing effort. Innate
biological characteristics such as limited brood size, late maturation and capture of spawning stock are the causes of continuous
decline. Conservation measures are required to protect this resource from further depletion.
 
Publisher CMFRI; Kochi
 
Date 2009
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/5892/1/a3.pdf
Raje, S G and Zacharia, P U (2009) Investigations on fishery and biology of nine species of rays in Mumbai waters. Indian Journal of Fisheries, 56 (2). pp. 95-101.