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

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Title Investigations on fishery and biology of nine species of rays in Mumbai
waters
Not Available
 
Creator Raje,S G
Zacharia,P U
 
Subject fishery
biology
rays
Mumbai waters
 
Description Not Available
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.
Not Available
 
Date 2021-09-15T09:54:20Z
2021-09-15T09:54:20Z
2009
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/62464
 
Language English
 
Relation Not Available
 
Publisher CMFRI; Kochi