지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1994.8
- 수록면
- 165 - 175 (11page)
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초록· 키워드
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Attempts were made to find out nitrogen and phosphorus loads to aquatic environment resulting from feeding Nile tilapia (Oreochromis niloticus). Two different size groups, small and large, were used. The average sizes of small and large tilapia were 65.2 g and 389.2 g respectively, and three kinds of commercial diets were used for each size.
The 3 kinds of commercial diets for tilapia contained in average 33.8% crude protein (5.4% nitrogen) and 1.4% total phosphorus. The load of nitrogen and phosphorus were measured by subtracting the amounts of nutrients retained in the body of fish from consumed nutrients. Sixty, five percentage of total feces was excreted within 24 hours after feeding at 23℃. Nitrogen content in the feces was higher in large fish than small ones.
The apparent digestibility of dietary protein for small and large tilapia was 90.0% and 89.7%, respectively. Availability of dietary phosphorus for small and large tilapia was 44.7% and 51.4%, respectively. The total load of nitrogen and phosphorus per 1 metric ton of tilapia production was 49.5 kg and 6.3 kg, respectively, for small ones with feed conversion ratio (FCR) of 1.4, and 61.3 kg and 13.4 kg, respectively, for large ones with the FCR of 1.8.
Nitorgen balance appeared that small and large tilapia excreted 7.1% and 9.9% of consumed nitrogen through fecal-nitrogen and 55.5% and 62.3% through urine and gills, retaining 37.4% and 27.8% in the body, respectively. These results show that small fish pollute less than large fish, excreting less and retaining more nutrients in the body.
The 3 kinds of commercial diets for tilapia contained in average 33.8% crude protein (5.4% nitrogen) and 1.4% total phosphorus. The load of nitrogen and phosphorus were measured by subtracting the amounts of nutrients retained in the body of fish from consumed nutrients. Sixty, five percentage of total feces was excreted within 24 hours after feeding at 23℃. Nitrogen content in the feces was higher in large fish than small ones.
The apparent digestibility of dietary protein for small and large tilapia was 90.0% and 89.7%, respectively. Availability of dietary phosphorus for small and large tilapia was 44.7% and 51.4%, respectively. The total load of nitrogen and phosphorus per 1 metric ton of tilapia production was 49.5 kg and 6.3 kg, respectively, for small ones with feed conversion ratio (FCR) of 1.4, and 61.3 kg and 13.4 kg, respectively, for large ones with the FCR of 1.8.
Nitorgen balance appeared that small and large tilapia excreted 7.1% and 9.9% of consumed nitrogen through fecal-nitrogen and 55.5% and 62.3% through urine and gills, retaining 37.4% and 27.8% in the body, respectively. These results show that small fish pollute less than large fish, excreting less and retaining more nutrients in the body.
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