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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국수산과학회 양식분과 한국양식학회지 한국양식학회지 제8권 제3호
발행연도
1995.8
수록면
195 - 207 (13page)

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In order to study the embryonic development and hatching of wild long shanny, Stichaeus grigorjewi, were caught with the gill nets in the East Sea of Korea, and stocked at indoor tanks to induce natural spawning in February 25, 1994 and February 16 to 24, 1995. They were already matured when stocked, and average body length (50.66 cm) and body weight (1,192.74 g) of 57 females and average body length (48.62 cm) and body weight (612.58 g) of 43 males were recorded. Before stocking, they were inserted with identification tags (ID tags) in the dorsal muscle, and spawning was traced by the portable reader (Destron / IDI Ltd.).
Forty females among 57 spawned successfully in the average of 4 days after stocking. Females spawned almost all eggs contained in the ovaries at one time in the form of an egg mass and averaging 227,200 eggs per egg mass. The egg mass was oval in shape, translucent milky in color, 20.32 cm long axis and 14.57 cm short axis in size, and 803.7 g in weight. Male parents guarded their egg masses and circulated water with the tail part of the body.
Fertilized egg was spherical in shape, and their average diameter was 1.54 mm. Each egg had a containing single oil globule, and it's average diameter was 0.37 mm. The average water temperature was 13.2℃ and incubation times after fertilization were 5 hours 25 minutes up to 2-cell stage, 13 hours up to morula stage, and 66 hours 35 minutes up to embryo formation stage. Hatching rate was approximately 10 percent in 368 hours 50 minutes after fertilization, and approxionately 90 percent of eggs were hatched in 425 hours 30 minutes after fertilization.

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