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Age, growth and population structure of the yellowfin tuna Thunnus albacares (Bonnaterre, 1788) exploited along the east coast of India

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Relation http://eprints.cmfri.org.in/8940/
 
Title Age, growth and population structure of the yellowfin tuna Thunnus
albacares (Bonnaterre, 1788) exploited along the east coast of India
 
Creator Rohit, Prathibha
Rao, G Syda
Ram Mohan, K
 
Subject Tuna fisheries
age and growth
 
Description Lengths measurements of 6,758 yellowfin tuna (Thunnus albacares), landed by hook and line operators off eastern Indian
coast were taken (20ā€“185 cm FL) from 2003 to 2009. Age and growth were estimated using length based methods. The von
Bertalanffy growth parameters estimated were Lāˆ = 197.42 cm, annual K= 0.30 and t0= -0.1157. Mortality estimates were
M= 0.48 and Z= 0.71 and F= 0.23 with the exploitation ratio E= 0.32. Growth was rapid during the initial years when the
annual growth increment was as high as 36.6 cm during the first year then which to as low as 3.3 cm in the tenth year. The fish
attained a fork length of 56.2 cm at the end of one year. Size at maturity (87.5 cm) corresponded to an age of 1.7 years and
the oldest individual in the sample was 9+ years (186 cm). The annual mean lengths varied from 80.6 cm to 115.3 cm with
an average mean length of 101.9 cm. The fishery comprised of mostly adults with 64% comprising of fishes larger than size
at first maturity.
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/8940/1/Prathibha_Rohit.pdf
Rohit, Prathibha and Rao, G Syda and Ram Mohan, K (2012) Age, growth and population structure of the yellowfin tuna Thunnus albacares (Bonnaterre, 1788) exploited along the east coast of India. Indian Journal of Fisheries, 59 (1). pp. 1-6.