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http://dx.doi.org/10.7850/jkso.2013.18.3.131

Morphological and Genetic Stock Identification of Todarodes pacificus in Korean Waters  

Kim, Jeong-Yun (Department of Oceanography, Pukyung National University)
Yoon, Moon-Geun (Yangyang Salmon Station, Korea Fisheries Agency)
Moon, Chang-Ho (Department of Oceanography, Pukyung National University)
Kang, Chang-Keun (POSTECH Ocean Science & Technology Institute, Pohang University of Sciences and Technology)
Choi, Kwang Ho (Fisheries Resources Research Division, National Fisheries Research & Development Institute)
Lee, Chung Il (Department of Marine Bioscience, Gangneung-Wonju National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.18, no.3, 2013 , pp. 131-141 More about this Journal
Abstract
Stock identification of Todarodes pacificus collected in the East Sea, Yellow Sea and East China Sea during the period from September to December in 2011 was analyzed by morphometric characters and mitochondrial DNA (mtDNA) cytochrome oxidase subunit I (COI) gene nucleotide variations. Frequency distributions of mantle length was analyzed by morphological method with measuring size of T. pacificus. Then each stock was estimated to confirm their maturation for mean mantle length comparing with mean mature mantle length 20-22 cm. According to morphologic stock identification, it is estimated that the northern part of East Sea is categorized as summer stock and the rest parts, including mid /southern part of the East Sea, northern part of the East China Sea and northern part of the West Sea were autumn stock. For genetic analysis, a total 49 haplotypes were defined by 33 variable nucleotide sites. From the extensive haplotype diversity, limited nucleotide diversity and star-like shape of haplotype network, T. pacificus appears to have undergone rapid population expansion from an ancestral population with a small effective population size. Although pair-wise Fst estimates which represent genetic difference among groups were low, there are relatively remarkable difference of Fst between middle and southern part of the East Sea. Although middle part of the East Sea and southern part of the East Sea were situated at the East Sea, genetically separated groups were appeared.
Keywords
Todarodes pacificus; Morphologic and genetic stock identification; Mitochondrial DNA; Haplotype and nucleotide diversity;
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