赤鼻棱鳀的摄食与生态转换效率  

Consumption and ecological conversion efficiency of Thrissa kammalensis

作　　者：郭学武[1] 唐启升[1] 

机构地区：[1]中国水产科学研究院黄海水产研究所,山东青岛266071

出　　处：《水产学报》2000年第5期422-427,共6页Journal of Fisheries of China

基　　金：国家自然科学基金资助项目 !(49790 10 0 1)

摘　　要：:1998年 9月利用对虾养殖土池中的赤鼻进行了摄食与生态转换效率的观察研究。结果显示 ,赤鼻是典型的浮游动物食性鱼类 ,偏食大型桡足类和介形类 ,无明显摄食节律性 ;消化道日均食物含量 1.2 196g·(10 0g) -1·d-1,排空率 0 .3141g·(10 0g) -1·h-1,日摄食量 10 .813 5g·(10 0g) -1·d-1;食物转换效率 35 .0 8% ,能量转换效率 39.30 %。渤海赤鼻的年饵料需求量约为 870 0 0t。研究结果表明 ,较高的生态转换效率保证了赤鼻较高的生长率 ,因此较低的浮游动物生物量可支持这一鱼种较高的生产力 。Consumption and ecological conversion efficiency of rednose anchovy, Thrissa kammalensis, was determined with samples of 38.69-64.45mm in fork length and 0.5179-2.1878g in body weight, caught in an earthen pond for shrimp rearing. Being a typical zooplanktonvore, rednose anchovy preferred to feed large copepods and ostracods without distinct feeding rhythm. Daily food content in its complete digestive tract was 1.2196g·(100g) -1 ·d -1 on average, and its daily food consumption was 10.8135g·(100g) -1 ·d -1 with an evacuation rate of 0.3141g·(100g) -1 ·h -1 . Food and energy conversion efficiency of this fish was 35.08% and 39.30% respectively. In terms of its daily ration and abundance in the Bohai Sea, food requirement of rednose anchovy was deduced about 87 000 tones per year. Results indicate that high conversion efficiency ensures the anchovy high growth rate, and lower zooplankton abundance may support its higher productivity. That supplies a reason for that the stock of rednose anchovy increased rapidly while the biomass of zooplankton declined obviously in the Bohai Sea in recent years.

关 键 词：赤鼻LengLi 摄食 生态转换效率 渤海 浮物动物食性 

分 类 号：Q959.466[生物学—动物学] S931.1[农业科学—渔业资源]