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Occurrence of skipjack tuna (Katsuwonus pelamis) larvae in Korean waters

가다랑어 (Katsuwonus pelamis) 자어의 국내 출현

  • Received : 2015.01.14
  • Accepted : 2015.02.16
  • Published : 2015.02.28

Abstract

Three specimens of larvae (5.2~7.8 mm in standard length (SL)), of the family Scombridae, were collected from the southeastern waters off Jeju Island in August, 2014. These specimens were identified to Katsuwonus pelamis have melanophores distributed on the 1st dorsal-fin spines and post ventral margin on caudal peduncle. An analysis of the cytochrome oxidase submit I (COI) sequences (652 base pairs) of mitochondrial DNA showed that our specimens must be K. pelamis, because their sequences were concordant with those of the adult K. pelamis (genetic distance= 0.000~0.002), followed by Auxis rochei (genetic distance= 0.061~0.063) and Euthynnus affinis (genetic distance= 0.077~0.079). During the larval stage, K. pelamis differed from Thunnus spp. species in melanophores distribution period of 1st dorsal-fin spines, lower jaws and ventral margin on caudal peduncle. In conclusion, occurrence of K. pelamis larvae means Korean waters are potential spawning ground of K. pelamis.

Keywords

Skipjack tuna;Katsuwonus pelamis;Morphological identification;Molecular identification;Neighbor-Joining tree;Spawning ground

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Acknowledgement

Supported by : 국립수산과학원