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Spawning Inducement, Egg Development and Early Larval Rearing of Ark Shell (Tegillarca granosa) (L.)

꼬막 (Tegiilarca granosa) (Linngeus)의 산란유발 및 난 발생과 초기 유생 사육

  • 문태석 (국립수산과학원 양식환경연구소) ;
  • 정민민 (국립수산과학원 제주수산연구소) ;
  • 신윤경 (국립수산과학원 남해수산연구소) ;
  • 양문호 (국립수산과학원 제주수산연구소) ;
  • 고창순 (국립수산과학원 내수면양식연구소) ;
  • 장영진 (부경대학교 양식학과)
  • Published : 2004.12.01

Abstract

Spawning induction, egg development and larval growth of ark shell (Tegillarca granosa) (L.) were investigated. The most effective method of spawning induction was steady temperature increasing from$4^{\circ}C\;to\;28^{\circ}C$ with irradiation of sea water by UV after T. granosa was exposed to air at $4^{\circ}C$ Optimum condition for larval roaring was under the 32.4 psu and two temperature $regimes:\;28{\pm}1^{\circ}C\;and \;25{\pm}1^{\circ}C$. Fertilized eggs was demersal isolated eggs, and egg diameter was $60{\mu}$. D-shaped larvae appear about 20 hr after hatching with $94.1{\mu}$ in shell length and $86.7{\mu}$ in shell height. Ten days were required from hatching to umbo larva stage, of a mean shell length $125.2{\mu}$. On 25th day, the larva grew to $450{\mu}$ in shell length and began to settle on the bottom. Effect of temperature between $25^{\circ}C$ (control group) and $28^{\circ}C$ on larval growth was not different. Survival rate of larvae settled on the bottom was about $19{\%}$ in both temperatures conditions $(25^{\circ}C\;and\;28^{\circ}C)$.

Keywords

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