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Fishery of yellowfin tuna Thunnus albacares (Bonnaterre, 1788) in the Indian EEZ with special reference to their biology and population characteristics

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Title Fishery of yellowfin tuna Thunnus albacares (Bonnaterre, 1788)
in the Indian EEZ with special reference to their biology
and population characteristics
Not Available
 
Creator Prakasan,D
Elayathu,M N K
Ghosh,Shubhadeep
Joshi,K K
Rohit,Prathibha
Koya,K P Said
Abdussamad,E M
Sebastine,Manju
Beni,N
Rao,G Syda
 
Subject Exploitation
Growth
MSY
Oceanic tuna
Sexual maturity
Yellowfin tuna
 
Description Not Available
The fishery and population characteristics of yellowfin tuna, Thunnus albacares were monitored during
2006-'10. They were being caught as bycatch along the coasts of Indian mainland and island territories by
several coast-based fishery for a long time. Their landings by coast-based fishery was very nominal
(4,171 t year-1 average for 1985-2000) with considerable annual fluctuations until targeted fishery for the species
developed during the last decade. This resulted in considerable improvement in landings to a peak of 37,963 t in
2007. The production declined thereafter due to shift in the target resource of these vessels from yellowfin tuna
to billfishes and elasmobranchs. The annual average catch in oceanic fishery during 2006-'10 was 85,928 t. The
coast-based fishery exploit mainly surface tunas in the outer shelf, adjacent oceanic areas and seamounts. At
national level, the pooled catch was supported by 22 - 202 cm fishes with 66.3 cm as annual mean. Relatively
large fishes of 40 to 202 cm with 83.4 cm as mean length and dominated by 58-102 cm groups supported the
catch in line fishery. The gillnet fishery comprised 22 to 123 cm fishes dominated by 44-82 cm size and other
gears landed 26 to 110 cm size fishes dominated by 42 to 80 cm size. Length at capture was 44.8 cm in gillnets,
60.3 cm in hooks and lines and 42.7 cm in other gears. The length at first maturity was 57.6 cm and optimum
length for exploitation was 61.1 cm. They spawn round the year with peak during August-January. The mean
relative fecundity was 4,36,330 ova per kg body weight and it varied with size of the fish. Study shows that stock
of yellowfin tuna in Indian waters remain very healthy with large proportion of spawning stock biomass.
Exploitation range of coastal based fishery being very limited and oceanic fishery concentrated mainly in
international waters, large area of Indian EEZ remain unexploited by the country. Overall assessment of fishery
scenario indicates possibility of large proportion of yellowfin tunas, especially larger ones remain inaccessible
to Indian fishers and hence considerable scope for expanding the fishery.
Not Available
 
Date 2021-09-16T06:44:21Z
2021-09-16T06:44:21Z
2012
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/62940
 
Language English
 
Relation Not Available