農業部水產試驗所全球資訊網

本試驗之目的為尋求文蛤養成之最適投餌量,減少有機物堆積於池底，並藉由水質及底質的分析，建立文蛤池之環境評估指標。實驗設計為每週投餵2次，每次的投餵量為50 (A)、100 (B)、150 (C)、200 g (D)魚粉作為試驗組，每組2重覆共計8池。實驗結果發現收獲時各組的平均體重有明顯差異(p < 0.05)。以B組的7.55 g最好，其次為C組的6.0 g，最差為D組僅有4.74 g。各組活存率在84.1-92.7％之間，D組的活存率明顯低於其他三組(p ＜ 0.05)。各組池水的換水量以A、B兩組最少，C、D組最多且換水量有差異存在(p ＜ 0.05)。水中氨氮濃度在飼育3個月後，投餵量較多的C、D兩組逐漸高於A組和B組。底質的有機物含量、水溶性氨-氮及硫化物含量在前3個月有逐漸累積的現象，投餵量愈多的組別，底質的含量就愈高。氧化還原電位則隨著養殖時間的增加而減少，且飼料投餵量愈多的試驗組的電位負值也愈大。

摘要abstract(英) The objections of this study are to find a proper feeding quantity for the pond management of hard clam to minimize accumulation of organic matter in pond bottom soils, and reduce the impact on pond water and sediment quality. It was designed twice a week for the feeding frequency, Four different feeding quantity were 50 g (A), 100 g (B), 150 g (C), and 200 g (D) for once of each feeding. The effect of feeding quantity on the growth and survival of hard clam, pond water and sediment quality was studied in a 5- month growth trial. There was significant difference in the final weight among the treatments (p < 0.05). Average weight was 7.55, 6.00, 5.43, and 4.74 g for B-, C-, A-, and D-clam, respectively. Survival was behind 84.1-92.7％, group D had the lowest survival than the other groups was significant different (p < 0.05). There was a significant different (p < 0.05) on exchange volume of pond water, too. Exchange volume of group A & B were lower than group C & D. Rearing after 3 months, ammonia-N concentration of group C & D were higher than group A & B. The accumulation of organic matter, ammonia-N and sulfide were increasing gradually in pond soils during early three months. Feeding quantity was more increasing. The amount of sediments was more accumulating in pond bottom soil. Redox potential in the pond soil decreased with the rearing time. The group that had more amount of food was lower redox potential.