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Embryonic Developmen Larvae and Juveniles of the Small Yellow Croaker (Larimichthys polyactis) Reared in Aquarium

실내수조에서 사육한 참조기 배발생 및 자치어의 형태

  • 명정구 (한국해양연구원 해양생물자원연구본부) ;
  • 김용억 (부경대학교 자원생물학과) ;
  • 박용주 (한국해양연구원 해양생물자원연구본부) ;
  • 김병기 (강원도립대학 해양생물자원개발과) ;
  • 김종만 (한국해양연구원 해양생물자원연구본부) ;
  • 허형택 (한국해양연구원 해양생물자원연구본부)
  • Published : 2004.12.01

Abstract

On 11 June 1991, eggs from the brood stock of small yellow croaker (Larimichthys polyactis) were artificially fertilized using the standard dry method and were hatched. Each of the fertilized eggs (1.1-1.2 mm in diameter) had an oil globule and was transparent and buoyant. The fertilized eggs hatched in a range of water temperatures $(17.5-20.3^{\circ}C)$ 44 hrs after fertilization. The total lengths of the newly hatched larvae were 3.1-3.3 mm, and these hatchlings had 31 myotomes (10+21). Melanophores and yellow-brown chromatophores were concentrated on the head, at the ventral part of the yolk, and in the middle of the tail. Four days after hatching, the larvae completely absorbed the yolk and became flexions of 5.1-5.5 mm in total length. Fifteen days after hatching, one spine (the anterior tip of the maxillary) appeared in the upper jaw and three spines developed at the upper parts of the eyes and on the posterior part of the head. At this stage, the larvae were approximately 8.3 mm long. Thirty-nine days after hatching, juveniles (1.9-3.4 mm in total length) had a pointed tail fin. By 66 days after hatching, the juvenile fish (about 4.0-6.5 mm in total length) were similar to adult fish in body shape. The larvae of L. polyactis could be distinguished from those of L. croacea by two distinct characteristics: the large number of vertebrae (28-29), and a relatively small bony ridge on the occipital region of the head.

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