沙氏下幼鱵鱼摄食与生态转换效率的现场测定  

In situ determination on food consumption and ecological conversion efficiency of a marine fish species,Hyporhamphus sajori

作　　者：孙耀[1] 于淼[1] 张波[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：《海洋学报》2003年第S2期122-127,共6页

基　　金：国家重点基础研究发展规划资助项目(G1999043710).

摘　　要：研究采用Eggers现场胃含物法,研究了我国黄海主要小型鱼类沙氏下幼鱼的摄食和生态转换效率等生态能量学特征.结果表明(1)沙氏下鱼全天都有摄食行为,故空胃率极低,仅为总检测鱼数量的4 5%.但仍有比较明显的摄食节律;在夜间00:00时有一非常明显的摄食高峰期,白天的摄食水平始终较高.(2)消化道排空模型为一指数曲线St=ae-b·t,两次测定中的瞬时排空率相差很小,均值为0 13g/(100g·h).(3)日摄食量随时间呈波浪形变化趋势,波距约14d,波高变化较大;平均日摄食量为(10 16±1 19)g/(100g·d)或(55 56±6 51)kJ/(100g·d).(4)从沙氏下鱼的实测日生长量为3 24g/(100g·d)或12 91kJ/(100g·d),可求得其食物转换效率和能量转换效率分别为31 89%或23 24%.The food consumption and ecological conversion efficiency of a marine pelagic fish species, Hyporhamphus sajori, were determined by using in situ stomach content method given by Eggers. The results indicate that: (1) The fish could feed all day, so the empty stomach rate is quite low, only accounts for about 4.5% of the total determined fish; however, the fish still has significant daily feeding rhythm; a food consumption peak appears at 00:00 o'clock, and the food consumption maintains relatively high level at daytime; (2) the model of gastric evacuation rate can be represented by an exponential curve equation, S_t=ae^(-b·t); the instantaneous gastric evacuation rates determined at two times have no significant difference, with the average being 0.13 g/(100 g·h); (3) the daily food consumption tends to change wave upon wave with time, the average being (10.16±1.19)g /(100 g·d) or(55.56±6.51)kJ/(100g·d); the wave distance is 14 d, but the wave height varies largely; (4) determined actual daily growth rate is 3.24 g/(100g·d) or 12.91 kJ/(100g·d); based no this value, ecological conversion efficiency can be calculated, i.e., 31.89% or 23.34%.

关 键 词：现场测定 摄食 生态转换效率 沙氏下鱵幼鱼 

分 类 号：S917[农业科学—水产科学]