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Population dynamics of cobia Rachycentron canadum (Linnaeus, 1766) off Cochin coast, south-eastern Arabian Sea

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Title Population dynamics of cobia Rachycentron canadum (Linnaeus, 1766)
off Cochin coast, south-eastern Arabian Sea
Not Available
 
Creator Beni,N
Rajool Shanis,C P
Akhilesh,K V
Pillai,N G K
Ganga,U
Manjebrayakath,Hashim
Prakasan,D
 
Subject Biology
Cobia
Population dynamics
Rachycentron canadum
 
Description Not Available
Estimated landings of cobia from the Indian EEZ by the commercial fishing vessels are mostly as bycatch in hooks and line
cum gillnet and trawl nets. However, the catches are substantial compared to that reported in several other countries of Asia.
The species is also gaining considerable importance as a favoured candidate species for sea farming using cages. Very little
is known about the fishery and biological characters such as maturation, fecundity and feeding preferences of cobia in Indian
seas. Study indicated a fast growth rate with estimates of L∞ = 184 cm (FL) and K = 2.6 (yr-1) in cobia. The total mortality rate
(Z) was estimated as 5.18, natural mortality (M) was 2.01 and fishing mortality (F) was 3.17 with an exploitation rate (E) of
0.61. The length at first capture (Lc50) estimated from the catch curve was 72 cm. Fecundity was found to be high and
variable, with mean fecundity estimated as 12,37,545 eggs with a coefficient of variation (CV) of 16.7. As inferred from the
oocyte development pattern, spawning activity is brief and fish is classified as synchronous ovulatory type. The growth
parameters and condition factor estimated in this study indicate that relatively high growth rates are also possible in wild
stocks considering that food is abundant and the environmental temperature is in the optimum range. Feeding
preferences indicated balistid fish and shrimps with a wide variety of food items including finfishes, crustaceans and molluscs
present.
Not Available
 
Date 2021-09-16T06:56:43Z
2021-09-16T06:56:43Z
2012
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/63018
 
Language English
 
Relation Not Available