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    Single genetic stock of kawakawa Euthynnus affinis (Cantor, 1849) along the Indian coast inferred from sequence analyses of mitochondrial DNA D-loop region

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    Chem_Geol_322-323_68a.pdf (1.567Mb)
    Date
    2012
    Author
    GirishKumar
    Kunal, S.P.
    Menezes, M.R.
    Meena, R.
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    Abstract
    Kawakawa Euthynnus affinis is an epipelagic migratory tuna species, widely distributed in the tropical and subtropical waters of the Indo-Pacific region. Kawakawa constitutes the largest tuna fishery in the Indian waters. In the present study, genetic variation was assessed using sequence analyses of Mitochondrial DNA (mtDNA) D-loop region. A 500 bp segment of D-loop region was sequenced in 400 samples collected from eight localities (Veraval (VE), Ratnagiri (RA), Kochi (KO), Kavaratti (KA), Port-Blair (PB), Tuticorin (TU), Pondicherry (PO), and Vizag (VI)) along the Indian coast. Analysis of molecular variance of mtDNA data revealed no significant genetic differentiation among sites the (phi = 0.0028, P = 0.20723) indicating a single population along the Indian coast. Phylogenetic analysis revealed no obvious phylogeographic pattern separating the eight samples of kawakawa. However, the genealogical relationships demonstrated that mtDNA D-loop sequences belong to two different clades (clade I and clade II). Clade I is the major clade which consists of more than 98% specimens from each regional population while clade II has individuals from only three populations (VE, PO, and VI). Results of genetic analyses of the present study support a single stock management of kawakawa along the Indian coast.
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    http://drs.nio.org/drs/handle/2264/4108
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