순치 기간에 따른 육봉형 산천어(Oncorhynchus masou masou )의 해수 적응능력
Seawater Adaptability of Land-locked Masu Salmon Oncorhynchus masou masou by Acclimation
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초록
The seawater adaptability of land-locked masu salmon Oncorhynchus masou masou via acclimation was examined for aquaculture purposes. The survival, blood chemistry, and histological changes of masu salmon (150 g) were measured after 7-, 15-, and 30-day acclimation periods. After a total of 60 days in seawater cultures that incorporated the various acclimation periods, survival was 83.5, 87.2, and 91.0% for the 7-, 15-, and 30-day periods, respectively; thus,survival increased with longer periods of acclimation. Feeding efficiencies were 32.1, 52.0, and 40.6% for the 7-, 15-,and 30-day periods, and specific growth rates were 0.14, 0.26, and 0.23%, respectively. Generally, masu salmon appeared to exhibit better growth performance after an acclimation period of 15 days. Cortisol concentrations [mean ±SD] for 7, 15, and 30 days of acclimation were 21.0 ± 6.5, 17.8 ± 4.8, and 21.2 ± 5.4 μg/dl, with the lowest values occurring with 15 days of acclimation. Osmolarities were 359.2 ± 26.1, 350.4 ± 29.2, and 354.6 ± 29.3 mOsm/kg,and glucose concentrations were 60.7 ± 20.7, 72.9 ± 17.3, and 76.6 ± 14.1 mg/dl for the 7-, 15-, and 30-day acclimation periods, respectively (P < 0.05). The histological study revealed that both gills and both kidneys of the masu salmon exhibited middle- to end-stage and middle-stage lesions in the 7- and 15-day groups, respectively, whereas these organs only had early-stage lesions in the 30-day group in the final experiment. Therefore, the seawater acclimation of masu salmon should involve more than 30 days in seawater.
Abstract
The seawater adaptability of land-locked masu salmon Oncorhynchus masou masou via acclimation was examined for aquaculture purposes. The survival, blood chemistry, and histological changes of masu salmon (150 g) were measured after 7-, 15-, and 30-day acclimation periods. After a total of 60 days in seawater cultures that incorporated the various acclimation periods, survival was 83.5, 87.2, and 91.0% for the 7-, 15-, and 30-day periods, respectively; thus,survival increased with longer periods of acclimation. Feeding efficiencies were 32.1, 52.0, and 40.6% for the 7-, 15-,and 30-day periods, and specific growth rates were 0.14, 0.26, and 0.23%, respectively. Generally, masu salmon appeared to exhibit better growth performance after an acclimation period of 15 days. Cortisol concentrations [mean ±SD] for 7, 15, and 30 days of acclimation were 21.0 ± 6.5, 17.8 ± 4.8, and 21.2 ± 5.4 μg/dl, with the lowest values occurring with 15 days of acclimation. Osmolarities were 359.2 ± 26.1, 350.4 ± 29.2, and 354.6 ± 29.3 mOsm/kg,and glucose concentrations were 60.7 ± 20.7, 72.9 ± 17.3, and 76.6 ± 14.1 mg/dl for the 7-, 15-, and 30-day acclimation periods, respectively (P < 0.05). The histological study revealed that both gills and both kidneys of the masu salmon exhibited middle- to end-stage and middle-stage lesions in the 7- and 15-day groups, respectively, whereas these organs only had early-stage lesions in the 30-day group in the final experiment. Therefore, the seawater acclimation of masu salmon should involve more than 30 days in seawater.
참고문헌 (12)
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