Occurrence of Fish Larvae and Juveniles in Tan-Shui Estuary,Northern Taiwan

爲探討花身鷄魚(Terapon jarbua)之攝食節律性(feeding rhythm)，本實驗利用日夜不同時段所釣獲野生花身鷄魚之胃內容量變化，及記錄在實驗室內三種不同光照周期（自然光、全亮和全暗）下飼育之花身鷄魚的攝食量及攝食頻率。野生花身鷄魚在自然環境中，其胃容量／體重比值(SCW／BW)在14:00～00:00期間均低於1％，而在黎明時較高，在06:00～10:00呈現高峰，其比值達5％。室內實驗之結果顯示在自然光照下，日夜攝食率之變動呈現出規則之周期性，且有夜間高而白天低的趨勢；其它兩組光照周期之攝食率則呈現較不規則變動。由上述結果顯示花身鷄魚具有夜間活動之攝食周期，且可能屬於嗜弱光之攝食者。

關鍵字

仔稚魚；河口；潮汐

並列摘要

Feeding periodicity of thornfish(Terapon jarbua)was studied in both thefield and the laboratory study.The stomach content weights of the wildthornfish were analyzed to evaluate feeding rhythm in nature.The feedingamount and the feeding frequency were studied under three light regimes(natural light,continuous light,and continuous dark)in the laboratory.Theratio of the stomach content weight to the body weight(SCW/BW)of thewild thornfish was less than 1％ from noon to midnight(14:00-00:00)andhigher during early morning(6:00-10:00)with a peak value around 5％.Fedby buoyant food pellets in the laboratory,the feeding rhythm under thenatural light demonstrated a cyclic trend with higher rates in the nighttimeand lower in the daytime.Feeding activities became arrhythmic under theother two light regimes.It seems that thornfish is a nocturnal feeder andfeeds mainly under dim-light.

並列關鍵字

Fish Larvae and Juveniles ； Estuary ； Tide

國際替代計量

Occurrence of Fish Larvae and Juveniles in Tan-Shui Estuary,Northern Taiwan

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