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Gastropod resource distribution and seasonal variation in trawling grounds off Konkan Malabar region , eastern Arabian sea

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Title Gastropod resource distribution and seasonal variation in trawling grounds off Konkan Malabar region , eastern Arabian sea
 
Creator Thomas, Sujitha
Dineshbabu, A.P.
Sasikumar, Geetha
 
Subject Gastropods
Trawling grounds
Discard
Resource distribution
 
Description 384-392
 Gastropod resource distribution and seasonal
variation was studied from 2007-2010 based on onboard collection from multiday
trawlers operating in Konkan Malabar region along the eastern Arabian sea at
various depth
(0-50 m,
51-100 m
and 101-200 m),
for a total of 619 fishing days (32 months). Thirty five species belonging to
18 families and 4 orders were found in different depths. Family Muricidae
dominated in all the depth zone. In 0-50 m depth Tibia sp. (45%) dominated, while Turris
sps (19.7%) in 51-100 m and Conus sp. in 101-200 m. Highest diversity (Shannon
Weiner H (log 2) was found in 0-50
m depth during post- monsoon season and lowest (1.36) in
101-200 m
depth. Gastropod of common occurrence in all the depth zones constituted of six
species viz., Bursa
sp., Conus sp., Turris sp., Tibia sp.,
Natica sp., and Murex sp. Bursa sp., made major contribution to the
similarity in 50 m, Murex sp. in 100 m and
Strombus sp.in 200 m. Tibia sps made the largest contribution
to the dissimilarity between 50
m and 100
m depth zone in between groups analysis, while Strombus sp. contributed to the
difference between 100 and 200
m depth zones. When considering the season as factor, Bursa
sp., Murex sp., and Tonna sp., makes the major contribution
to similarity between premonsoon, postmonsoon and monsoon respectively. Dissimilarity
between premonsoon and postmonsoon is contributed by Turris sps, while Tonna
sps contributes to dissimilarity between premonsoon and monsoon season and Tibia sp., contributed to post monsoon
and monsoon season.
 
Date 2014-03-06T06:57:58Z
2014-03-06T06:57:58Z
2014-03
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/27328
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(3) [March 2014]