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Biology and fishery of the bullet tuna, Auxis rochei (Risso, 1810) in Indian waters

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Relation http://eprints.cmfri.org.in/9505/
 
Title Biology and fishery of the bullet tuna, Auxis rochei (Risso, 1810)
in Indian waters
 
Creator Jasmine, S
Rohit, Prathibha
Abdussamad, E M
Koya, K P Said
Joshi, K K
Kemparaju, S
Prakasan, D
Elayathu, M N K
Sebastine, Manju
 
Subject Tuna fisheries
 
Description Auxis rochei, popularly known as the bullet tuna, is the smallest of all tuna species available in Indian waters. Its distribution
is reported from all maritime states but it forms a fishery of commercial importance only in the south-west region (Kerala,
Tamil Nadu and Karnataka) with targeted fishery being carried out in southern Kerala. The average annual catch (2006-
2010) is estimated at 3,131 t, constituting 2.8% of the total tuna landings. Commercial exploitation is mainly by gillnets and
small hook and lines with the 0-1 yr old fishes comprising bulk of the commercial catch. The length-weight relationship was
estimated as W=0.0076L3.249 with no significant difference between the sexes. Size at first maturity was estimated at 23.6 cm
and fecundity estimated was 12,03,258. A. rochei spawns throughout the year with peak during July-September. Zooplankton,
fishes and crustaceans were the dominant food items recorded. The von Bertalanffy growth parameters estimated were
L∞= 42.3 cm, K= 0.61 yr-1 and t0= -0.0337. Mortality estimates were M=1.18 and Z=5.90 and F=4.72 with a high exploitation
rate of E=0.80, calling for appropriate management measures to be adopted for continued exploitation at sustainable levels.
 
Publisher Central Marine Fisheries Research Institute
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/9505/1/2-S_Jasmine.pdf
Jasmine, S and Rohit, Prathibha and Abdussamad, E M and Koya, K P Said and Joshi, K K and Kemparaju, S and Prakasan, D and Elayathu, M N K and Sebastine, Manju (2013) Biology and fishery of the bullet tuna, Auxis rochei (Risso, 1810) in Indian waters. Indian Journal of Fisheries, 60 (2). pp. 13-20.