科研之友
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摘要
To understand the actual production of fish culture about the utilization of dietary protein and excreta impact on the environment between mandarin fish (Siniperca chuatsi) and grass carp (Ctenopharyngodon idellus), the study to investigate the effect of temperatures (19 +/- 0.5 degrees C, 24 +/- 0.5 degrees C and 29 +/- 0.5 degrees C) on ammonia-N excretion in mandarin fish and grass carp under fed and fasted states was conducted. These two species were fed a practical diet containing 325.2gkg(-1) crude protein at 3% body weight per day. The ammonia-N excretion rate was significantly increased when temperature increased from 19 to 29 degrees C, and a linear relationship between ammonia-N excretion rate and temperature. The maximum ammonia-N excretion levels of mandarin fish and grass carp were observed at 4-8h and 2-4h after feeding, respectively, and the minimum values for both species were observed at 24h after feeding. Under the feeding condition, mandarin fish had a lower ammonia-N excretion level compared to grass carp at 24 degrees C and 29 degrees C. The average amount of ammonia-N excreted by mandarin fish at 24h is significantly higher than grass carp under fasting conditions, except 19 +/- 0.5 degrees C. These results indicated that mandarin fish might make better use of protein at higher temperature than grass carp when fed practical diets in commercial production. These results of this study suggested that mandarin fish had a lower ammonia-N excretion level compared with grass carp, making a less contribution to environmental loading in an intensive fish culture.
- 出版日期2017-3
- 单位华中农业大学
