성숙 유도한 한국산 고등어 (Scomber japonicus)의 난발생과 자치어의 형태 발달
Development of the Eggs, Larvae and Juveniles by Artificially-Matured Pacific Mackerel, Scomber japonicus in the Korean Waters
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Development of egg, larvae and juveniles for the Pacific mackerel, Scomber japonicus are described following natural fertilization in the indoor tank of 25℃ water temperature. Following a routine hormone treatment technique for the brood stock, male and female mackerels were artificially matured by intramuscular injections of LHRHa at a dosage of 400μg/kg body weight (BW)+Domperidone at a dosage of 4μg/kg body weight (BW) to induce maturation in a separate aquarium and induced natural spawning. Fertilized eggs were ca. 1.0mm in diameter; spherical in shape with a single oil globule; pelagic and non-adhesive. Hatching occurs 41 hours after fertilization at 23-24℃. The newly hatched larvae was 3.03mm in average total length (ATL), the mouth and anus were not open, oil globule located in posterior end of yolk sac, and preanal length was 42.8% of TL. The larvae measuring 2.89mm ATL, almost absorbed yolk sac and oil globule material in 2days after hatching, in which the mouth and anus were open. Melanophores, branch or star in shape were observed on the top of head, peritoneal region and along the ventral contour. In 13days after hatching, the larvae was 6.88mm ATL, its posterior end of notochord began to flex upward, finfold of caudal fin appeared, jaw teeth were already formed. In 19days after hatching, the larvae was 7.71mm ATL completed only caudal fin rays (9+8), and preanal length was 49.4% of TL. In 37days after hatching, the larvae was 27.4mm ATL already completed all the fins, and preanal length was 59.9% of TL.
Abstract
Development of egg, larvae and juveniles for the Pacific mackerel, Scomber japonicus are described following natural fertilization in the indoor tank of 25℃ water temperature. Following a routine hormone treatment technique for the brood stock, male and female mackerels were artificially matured by intramuscular injections of LHRHa at a dosage of 400μg/kg body weight (BW)+Domperidone at a dosage of 4μg/kg body weight (BW) to induce maturation in a separate aquarium and induced natural spawning. Fertilized eggs were ca. 1.0mm in diameter; spherical in shape with a single oil globule; pelagic and non-adhesive. Hatching occurs 41 hours after fertilization at 23-24℃. The newly hatched larvae was 3.03mm in average total length (ATL), the mouth and anus were not open, oil globule located in posterior end of yolk sac, and preanal length was 42.8% of TL. The larvae measuring 2.89mm ATL, almost absorbed yolk sac and oil globule material in 2days after hatching, in which the mouth and anus were open. Melanophores, branch or star in shape were observed on the top of head, peritoneal region and along the ventral contour. In 13days after hatching, the larvae was 6.88mm ATL, its posterior end of notochord began to flex upward, finfold of caudal fin appeared, jaw teeth were already formed. In 19days after hatching, the larvae was 7.71mm ATL completed only caudal fin rays (9+8), and preanal length was 49.4% of TL. In 37days after hatching, the larvae was 27.4mm ATL already completed all the fins, and preanal length was 59.9% of TL.
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