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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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Relation http://eprints.cmfri.org.in/5841/
 
Title Ray fishery by trawlers off Chennai and some aspects of biology of the scaly whipray Himantura imbricata (Bloch & Schneider, 1801)
 
Creator Kizhakudan, Shoba Joe
Mohanraj, G
Batcha, Hameed
Rajapackiam, S
 
Subject Elasmobranch Fisheries
Ray fisheries
 
Description 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.
 
Publisher MBAI, Cochin
 
Date 2010
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/5841/1/12._Sho.pdf
Kizhakudan, Shoba Joe and Mohanraj, G and Batcha, Hameed and Rajapackiam, S (2010) Ray fishery by trawlers off Chennai and some aspects of biology of the scaly whipray Himantura imbricata (Bloch & Schneider, 1801). Journal of the Marine Biological Association of India, 52 (1). pp. 92-95.