Osteological Development of the Larvae and Juvenile in Coreoperca herzi (Perciformes: Centropomidae)

꺽지 (Coreoperca herzi) 자치어의 골격발달

  • Received : 2017.02.03
  • Accepted : 2017.03.18
  • Published : 2017.03.31

Abstract

Samples were obtained from broodstok in May, 2010, while naturally fertilized embryos were maintained, and the process of skeletal development was observed from larvae and juvenile. Prelarvae immediately after hatching showed an average total length of $6.85{\pm}0.63mm$ (n =5), Premaxillary and dentary were ossified, parasphenoid was ossified in the cranium, and centrum and caudal bone did not ossify. Prelarvae showed ossification with maxillary, articular, and epihyal, and branchiostegal rays of hyoid arch were ossified at 2 to 3 days after hatching with an average total length of $7.25{\pm}0.28mm$ (n=5). The vertebrae began to ossify in the direction of the tail, and neural spine began to ossify above the ossified vertebra. Postlarvae showed ossification of lateral ethmoid, alisphenoid, parietal, and caudal skeleton in the cranium when the average total length was $9.00{\pm}1.53mm$ (n=5) in 6 days after hatching. At 40 days after hatching, postlarvae ossified maxillary in the cranium, and ossified endopterygoid and ectopterygoid, etc. in the palate, when the average length of $23.3{\pm}0.28mm$ (n=5). At 120 days after hatching, with the average length was $37.5{\pm}2.83mm$ (n=5), caudal skeleton had one additional epural bone ossification, resulting in ossification of a total of 3 epural bone to complete ossification of all spicules.

2010년 5월 사육 중인 친어로부터 자연산란 된 수정란을 관리하던 중 부화된 자치어를 사육하면서 발육단계에 따른 골격발달과정을 관찰하였다. 부화 직후의 전기자어는 평균전장 $6.85{\pm}0.63mm$(n=5)로 전상악골과 치골이 골화하였고, 두개골에는 부설골이 골화하였으며, 추체와 미골부는 골화가 일어나지 않았다. 부화 2~3일 후 평균전장 $7.25{\pm}0.28mm$(n=5)일 때 전기자어는 주상악골, 관절골이 골화하였고, 설궁부의 상설골과 새조골이 골화하였다. 척추골은 꼬리방향으로 골화하기 시작하였고, 골화된 척추골의 위쪽에는 신경극이 골화하기 시작하였다. 부화 6일 후 평균전장 $9.00{\pm}1.53mm$(n=5)일 때 후기자어는 두개골에 측사골, 익설골, 노정골 등이 골화하였고, 미골은 미부봉상골이 상단부로 $45^{\circ}$ 휘면서 골화하였다. 부화 40일 후 평균전장 $23.3{\pm}0.28mm$(n=5)일 때 후기자어는 두개골에 중사골, 구개부에 내익상골, 외익상골 등이 골화하였다. 부화 120일 후 평균전장 $37.5{\pm}2.83mm$(n=5)일 때 치어는 미골은 1개의 상미축골이 추가로 골화되면서 총 3개의 상미축골이 골화하면서 모든 골편들의 골화가 완성되었다.

Keywords

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