꼬막 (Tegillarca granosa) (Linnaeus)의 산란유발 및 난 발생과 초기 유생 사육 = Spawning Inducement, Egg Development and Early Larval Rearing of Ark Shell (Tegillarca granosa) (L.)

다국어 초록 (Multilingual 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℃ to 28℃ with irradiation of sea water by UV after T. granosa was exposed to air at 4℃. Optimum condition for larval rearing was under the 32.4psu and two temperature regimes: 28±1℃ and 25±1℃. Fertilized eggs was demersal isolated eggs, and egg diameter was 60μm. D-shaped larvae appear about 20 hr after hatching with 94.1μm in shell length and 86.7μm in shell height. Ten days were required from hatching to umbo larva stage, of a mean shell length 125.2μm. On 25th day, the larva grew to 450μm in shell length and began to settle on the bottom. Effect of temperature between 25℃ (control group) and 28℃ on larval growth was not different. Survival rate of larvae settled on the bottom was about 19% in both temperatures conditions (25℃ and 28℃).

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