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조피볼락(Sebastes schlegelii)의 성장, 사료 섭취, 체성분 및 혈액성상에 미치는 사료 공급 횟수의 영향
오승용 ( Sung-yong Oh ),박진우 ( Jin Woo Park ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.5
The effects of feeding frequency on the growth, food consumption, body composition, and hematological response of the Korean rockfish Sebastes schlegelii were investigated for 77 days at ambient water temperatures (17.2-24.5℃) in a sea cage in Tongyeong, Korea. Three replicate groups of fish were hand-fed to satiation with a commercial diet in one of four different feeding frequency trials (one meal every 2 days, and one, two and three meals per day). At the end of the experiment, the mean weight gain, specific growth rate, and daily feed intake of fish fed one and two meals per day were significantly higher than those of fish fed one meal every 2 days or three meals per day. The feed efficiency of the fish fed three meals per day was significantly lower than that of the fish in the other groups. The glucose concentration of fish fed one meal every 2 days was significantly higher than that of the other groups. We conclude that the optimum feeding frequency for improving the growth of Korean rockfish weighing 100-200 g reared in sea cages is one meal per day under our experimental conditions.
Pop-up Satellite Archival Tag (PSAT) 체외 부착방법에 따른 방어(Seriola quinqueradiata)의 혈액성상 및 PSAT 부착효율
오승용 ( Sung-yong Oh ),정유경 ( Yu-kyung Jeong ) 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.1
This study aimed to determine the effect of the pop-up satellite archival tag (PSAT) tagging method on the blood indices and PSAT attachment efficiency of yellowtail Seriola quinqueradiata (mean body weight 10.2 kg). Based on tagging method, the fishes were divided in four different groups: untagged (control), single anchor (SA), dual anchor (DA), and silicon tube (ST). The blood indices and PSAT attachment efficiency were investigated on days 1, 14, and 28 after tagging PSAT on the muscle below the dorsal fin for each tagging method in triplicates. After 28 days of tagging with PSAT, a significant increase was observed in plasma glucose level in the ST group and in total protein level in the DA and ST groups. The levels of glucose, total protein, and total cholesterol in the SA group after 28 days of tagging were significantly lower than in the control group. The efficiencies of PSAT attachment were 0% in the SA and DA groups on 14 days post-tagging, and 66.7% in the ST group on 28 days post-tagging. The study results indicate that the proper PSAT tagging method is the ST type. The information obtained in this study presents valuable data that provide the required PSAT operational tool for industrial development and ecological monitoring of yellowtail.
순환여과식 내 수온에 따른 돌돔(Oplegnathus fasciatus) 치어의 절식 및 식후 암모니아 배설
오승용 ( Sung-yong Oh ),최희정 ( Hee-jung Choi ) 한국수산과학회(구 한국수산학회) 2020 한국수산과학회지 Vol.53 No.6
This study investigated diurnal fasting and postprandial total ammonia nitrogen (TAN) excretion rates in juvenile Oplegnathus fasciatus (rock bream; mean body weight 45.8±1.1 g) at three temperatures (15, 20, and 25°C) in a recirculating system (three replicates). The fish were hand-fed twice daily (09:00 and 17:00 h) with commercial food (46.7% protein) until satiation. The results showed that the fasting and postprandial TAN excretion rates were temperature-dependent. The mean hourly rates were 7.7 (15°C), 10.2 (20°C), and 11.9 (25°C) mg kg fish<sup>-1</sup> h<sup>-1</sup> for fasting and 34.0 (15°C), 47.8 (20°C), and 60.2 (25°C) mg kg fish<sup>-1</sup> h<sup>-1</sup> for postprandial. At each temperature, two postprandial TAN excretion peaks were observed 2-4 h after feeding; the second peak was always higher. The TAN loss to nitrogen consumption ratio was 41.1-46.8 % and increased significantly with increasing temperature. Temperature affected fasting and postprandial TAN excretion in juvenile rock bream, providing insight for culture management.