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- 저자 : 허형택 ( Hyung Tak Huh ) (검색결과 3 건)
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해상 가두리에서의 은연어 양식실험 I. 종묘 나이에 따른 성장비교
김병기,명정구,김종만,허형택,김형배,Kim Pyong-Kih,Myoung Jung-Goo,Kim Jong-Man,Huh Hyung Tak,Kim Hyung Bae 한국양식학회 1990 韓國養殖學會誌 Vol.3 No.2
은연어 해상 사육 종묘의 나이에 따른 성장을 알아보기 위하여 1988년 12월 17일 부터 이듬해 4월 26일 까지 평균수온 $9.5\~14.5^{\circ}C$의 조건을 가진 경남 통영군 산양면 저도에 위치한 해상 가두리에서 실험을 실시하였다. 1 차 실험에서 평균 체중 167.0 g 되는 0+ 세어는 66일 후 633.1 g으로 성장하여 1 일 성장률 $2.0\%$, 사료계수 1.1을 나타냈다. 반면, 평균체중 396.0 g되는 1+ 세어는 854.6 g으로 성장하여 1 일 성장률 및 사료계수 각각 $2.0\%$ 및 1.1을 기록하였다. 2차 실험에서는 0+ 세어가 64일 후 1171.9 g으로 성장하여 1일 성장률 $1.0\%$, 사료계수 1.5로 나타났고, 1+ 세어는 1239.7 g으로 성장하여 1 일 성장률 및 사료계수 각각 $0.7\%$ 및 2.6을 기록하였다. 은연어의 해상 사육에 있어서 그 크기가 증가함에 따라 1 일 성장률 및 사료효율이 급격히 감소하는 것으로 나타났다. 실험 기간 동안 0+ 재어가 사료섭취율이 훨씬 우수하여 0+ 세어가 해상사육 종묘로 적합한 것으로 나타나 당년에 해상 사육용 종묘를 smolt 될 수 있도록 할 필요가 있다. Growth Comparisons of two age groups of coho salmon, Oncorhynchus kisutch, underyearling and age one, were made at Chungmu Experimental Fish Culture Station from December 17, 1988 to April 26, 1989. During the first 66 days of experimental period, the fish of underyearling group grew from 167.0 g to 633.1 g in average weight and the feed coefficient (FC) and daily growth rate (DGR) were 1.1 and $2.0\%$, respectively. In the same period, the fish of age one group grew from 396.0 g to 854.6 g in average weight and the FC and DGR were 1.1 and $2.0\%$, respectively. During the second 63 days, the fish of underyearling and age one group grew up to 1171.9 g and 1239.7 g respectively. FCs of these two groups were 1.5 and 2.6, respectively and DGRs were $1.0\%$ and $0.7\%$, respectively. Underyearling fish consumed more feed and performed better FC and DGR than age one fish. FC and DGR sharply decreased as the fish weight increased. Therefore under-yearling fish of this species seems better as seeds for seawater cage culture. For this purpose it is necessary to increase smolting rate in the underyearling group fish within a single season.
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명정구 ( Jung Goo Myoung ),김용억 ( Young Uk Kim ),박용주 ( Yong Joo Park ),김병기 ( Pyeong Ki Kim ),김종만 ( Jong Man Kim ),허형택 ( Hyung Tak Huh ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.6
N/A On 11 June 1991, eggs from the brood stock of small yellow croaker (Larimichthys polyactis) were artificially fertilized using the standard dry method and were hatched. Each of the fertilized eggs (1.1-1.2 mm in diameter) had an oil globule and was transparent and buoyant. The fertilized eggs hatched in a range of water temperatures (17.5-20.3℃) 44 hrs after fertilization. The total lengths of the newly hatched larvae were 3.1-3.3 mm, and these hatchlings had 31 myotomes (10+21). Melanophores and yellow-brown chromatophores were concentrated on the head, at the ventral part of the yolk, and in the middle of the tail. Four days after hatching, the larvae completely absorbed the yolk and became flexions of 5.1-5.5 mm in total length. Fifteen days after hatching, one spine (the anterior tip of the maxillary) appeared in the upper jaw and three spines developed at the upper parts of the eyes and on the posterior part of the head. At this stage, the larvae were approximately 8.3 mm long. Thirty-nine days after hatching, juveniles (1.9-3.4 mm in total length) had a pointed tail fin. By 66 days after hatching, the juvenile fish (about 4.0-6.5 mm in total length) were similar to adult fish in body shape. The larvae of L. polyactis could be distinguished from those of L. croacea by two distinct characteristics: the large number of vertebrae (28-29), and a relatively small bony ridge on the occipital region of the head.
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