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한국근해 황아귀 , Lophius litulon 의 연령과 성장
차병열(Byung Yul Cha),박영철(Yeong Chyll Park),허성회(Sung Hoi Huh) 한국수산과학회 1998 한국수산과학회지 Vol.31 No.4
Age and growth of the yellow goosefish, Lophius litulon, were studied using sample collected from the southwestern waters of Korea. Vertebrae of the fish had relatively clear annuli on their surface. The opaque zone of vertebrae was formed once a year between March and April. The oldest fish observed in this study was 8 fears old for females and 5 years old far males. The relationship between the radius (R) of vertebral centrum and total length (L) was as fellows: L= 12.7+4.8R for females and L=9.8+5.6R for males, The relationship between total length and body weight (W) was as fellows: W= 0.0089L^(3.30311) far females and W=0.0329L^(2.7752) for-males. Growth in length of the fish was expressed by the von Bertalanffy`s equation as L=127.60 (1-e^-0.1228(t+0.3851)) for females and L_t=82.73 (1-e^-0.1832(t+0.6431)) males.
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한산 거제만의 환경특성이 양식 굴의 비만에 미치는 영향
최우정(Woo Jeung Choi),전영열(Yong Yull Chun),박정흠(Jeung Hum Park),박영철(Yeong Chyll Park) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.5
Long line suspended culture of oysters has been started commercially in Hansan-Koje Bay since 1969. However, its Annual production has been decreased and culturing periods extended in recent years. So, we investigated environmental parameters and food organisms to identify the causes of poor fatness of oysters in Hansan-Koje Bay from February to November, 1994. As the result, the Water quality of Hansan-Koje Bay was found to be good for culture. For example, the mean concentration of COD was 1.35㎎/ℓ, phosphate phosphorus was 0.30㎍-at/ℓ and dissolved inorganic nitrogen was 4.68㎍-at/ℓ. However, the Hwado island and the inner part of the Hansan-Koje Bay were found to be eutrophicated due to various contaminants transported by land-based activities. But in the central part of the Hansan-Koje Bay where the oyster farms have been developed densely, the level of nutrient concentration was very low. During the study period, the dominant species of phytoplankton was Chaetoceros spp. with the percentage of 72.6%-87.8% and the mean values of Chlorophyll-a concentration and phytoplankton standing crops were 2.05㎎/㎥ and 188ind./㎖, respectively. The distribution of these parameters also showed similar trends those of nutrients. Especially, chlorophyll-a contents was very low with the concentration of below 0.5㎎/㎥ at central part of the Bay, Juklimpo. The fatness of oysters and the eutrophic index in this area were 18.1% and 0.54, respectively. These values were lower than those of other culturing farms in the southern coastal areas in Korea. Therefore, we estimated that the insufficient food supply due to the low level of nutritional status was the major factors affecting the poor fatness of the Pacific oysters in Hansan-Koje Bay.
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차병열(Byung Yul Cha),홍병규(Byung Que Hong),조현수(Hyun Su Jo),손호선(Haw Son Sohn),박영철(Yeong Chyll Park),양원석(Won Seok Yang),최옥인(Ok In Choi) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.1
Stomach contents of 518 specimens of the yellow goosefish, Lophius litulon caught by the off-shore stownet in the southern waters of Korea were examined by means of the calculation of the frequency of occurrence, number and weight percentages, and index of relative importance (IRI) in each prey organisms. Prey organisms of the yellow goosefish consist of fishes, crustaceans, cephalopods. Fishes were dominant prey group, and occupied 98.8% in IRI of prey organisms. Four species of fish, Pseudosciaena manchurica, Collichthys niveatus, Engraulis japonica, Trichiurus lepturus were dominant as to the IRI and occupied 87.2% of the total IRI. P. manchurica was a dominant prey organism in predator`s stomach through the year, and the other dominant prey organisms occurred intermittently with seasonal progress. P. manchurica was a dominant prey organism to all fish size, too. C. niveatus and E. japonica decreased in importance in the diet as the fish size increased, concomitant with an increase in importance of T. lepturus. Mean species number and mean individual number of prey organisms increased with the fish size.
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