澎湖近海嘉?魚攝食機構與食性之研究

Abstract

1．資料為自澎湖馬公，八個不同月份一支釣魚獲得的嘉?魚，共302尾，體長範圍由128 mm到585 mm。 2. 攝食機構形態上觀察的結果，顯示嘉?魚具有肉食性魚類攝食機構一般的特徵。 3．攝食機構形質測定結果，計數形質之鰓耙數目以17個為型量（範圍自12個到19個），幽門垂為4個。 4. 計量形質與體長成正比例，其間之相對關係，以空胃重量為最具代表性。 5. 餌料生物的組成以甲殼類為最多，其次是魚類，棘皮動物等，組成無月別上，體型別上的差異。 6．定量分析結果狂10、11、2月裹攝食量都較多，又體型小的魚的攝食量較多，攝食量可能因生長階段生理的不同而變化。 7. 胃內含物多成碎片，可能是攝食機構作用的結果，攝食狀態多為空胃與微量胃。 8. 由餌料生物之組成推側澎湖地區可能具有豐富的甲殼類資源。

The feeding mechanism of red sea bream and the relationship between body length (or Head length) and digestive organs were given in this paper. Feeding habits was surveyed through quantitative and qualitative analysis of stomach contents. Number of gill rakers ranges from 12 to 19, and the mode is 17. The relationship between the body length and the digestive organs of the fishes measured from 128 mm to 585 mm in body length was found to be linear. Having their intestines shorter than their bodies, conical like and granular teeth on their jaws, and coarse gill structure, the red sea bream is generally considered to be carnivorous. According to the feeding patterns, the empty stomach of the red sea bream constituted a higher percentage in the status of stomach examined. Most of the food organisms were small, sedentary or slow moving benthonic animals1, such as shrimps, crabs, squids, and sea lilies.