Acquisition of Nocturnal Feeding in Juvenile Silver Bream,Sparus Sarba

本報告探討腹鰭截斷標識法對黑鯛之標識效果及對其成長之影響。本試驗分左腹鰭截斷組、右腹鰭截斷組、左右腹鰭截斷組及未截斷腹鰭之對照組等四組進行。自1988年6月24日實施腹鰭截斷，於實驗室水族箱中飼養至1989年4月26日止，計305天。若以再生腹鰭之再生率在90％以下者視為可識別之標識魚，則腹鰭截斷300天後之識別率約為65％。若以再生腹鰭之鰭條數目及鰭條歪曲情形來識別標識魚，則腹鰭截斷231天後之識別率，右腹鰭截斷組為85.7％，左右腹鰭截斷組高達100％。各組試驗魚左右腹鰭之生長速度並無顯著之差異。但左右腹鰭截斷組與其他各組間在腹鰭之生長速度上具有顯著之差異，顯示若左右腹鰭同時截斷，則腹鰭再生之速度較為緩慢。試驗期間，左右腹鰭切斷組與對照組魚體之成長並無顯著之差異，但右腹鰭截斷組在飼養104天後，其成長卽顯著小於左右腹鰭截斷組及對照組。此可能係單側腹鰭截斷對游動平衡、攝餌行動有所影響所致。試驗期間，各組試驗魚之死亡並非腹鰭截斷所致，而係水質管理不佳，造成纖毛蟲、橈脚類、鰓吸蟲等之大量繁殖、附著、寄生而致死。

關鍵字

黃錫鯛稚魚；夜間攝食；被動攝食

並列摘要

This paper elucidates the effect of ventral fin clipping on the black seabream based on a sample of 200 fish with the commencement of study on June24,1988.The sample was divided into four equal groups,namely,fish withboth ventral fins clipped,fish with only right ventral fin clipped,fish withonly left ventral fin clipped,and the control group.The effects of fin-clippingon the fish were judged by examining indications of regeneration of clippedfins,change of fin ray counts of regenerated fins,and presence of twistedand shortened regenerated fins.The results showed that 65％ of the fin-clipped fish were discernible after 300 days of clipping when fin regenerationrate was less than 90％.However,if the indicator of discernibleness includedabnormal regenerated ventral fin which is lack of fin rays,with the fin twistedand shortened,then the discernible rates for the group with only right ventralfin clipped and the group with both ventral fins clipped were 85.7％ and 100％,respectively,after 231 days of clipping.Growth rate of the regenerated ventral fin of the fish with both fins clippedwas significantly lower than that of the fish with only one fin clipped.Thedifference of body growth rate between the fish with both ventral fins clippedand the control group was not significant.However,the body growth rate ofthe fish with only right ventral fin clipped was slower than that of the fishwith both ventral fins clipped and that of the control group.The resultssuggest that single-sided fin clipping might have affected balance in swimmingactivity and subsequently,the feeding activity,resulting in a slow body growthof the fish.

並列關鍵字

Juvenile Silver Bream ； Nocturnal Feeding ； Passive Feeding

國際替代計量

Acquisition of Nocturnal Feeding in Juvenile Silver Bream,Sparus Sarba

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