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Ray fishery by trawlers off Chennai and some aspects of biology of the scaly whipray Himantura imbricata (Bloch & Schneider, 1801)

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Title Ray fishery by trawlers off Chennai and some aspects of biology of the scaly whipray Himantura imbricata (Bloch & Schneider, 1801)
Not Available
 
Creator Kizhakudan,Shoba Joe
Mohanraj,G
Batcha,Hameed
Rajapackiam,S
 
Subject Chennai
ray fishery
Himantura imbricata
disc width-weight relationship
gut contents
 
Description Not Available
Rays are important components in the elasmobranch landings by different gears at Chennai fisheries
harbour, contributing about 75.4% to the annual average elasmobranch landings. The annual average
catch of rays during 2002-‘07 was 588.3 t and the maximum catch of 1297.4 t was recorded in the
year 2002. Eleven species contributed a major portion to the landings of rays by trawlers at Chennai,
among which Himantura jenkinsii dominated the catch, forming 38.6% and H. imbricata, 8.0%. The
disc width (DW) range of H. imbricata in the landings was 110-229 mm and 130-289 mm for males
and females, respectively. The annual average mean size was greater in females. The annual average
sex ratio (M:F) was 1:1.11. The disc width-weight relationships were W = 0.00022DW2.676 and W =
0.00005DW2.965 for male and female, respectively. Analysis of covariance showed that the slopes
differed significantly, at 5% level, between the sexes. More than 95% of fishes sampled were in wellfed
condition. Analysis of gut contents revealed H. imbricata to be a benthic carnivore feeding mostly
on small crustaceans, cephalochordates, molluscs, polychaetes and small fishes.
Not Available
 
Date 2021-09-16T05:25:54Z
2021-09-16T05:25:54Z
2010
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/62679
 
Language English
 
Relation Not Available
 
Publisher MBAI, Cochin