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1997~2000年在南海北部湾渔场调查中搜集了49种鱼,共计2 080尾。对其食性分析,并依其食料生物的生态类群以及消化器官特点,将其划分为5种食性类型:浮游生物食性、底栖生物食性、游泳动物食性、浮游生物兼底栖生物食性、底栖生物兼游泳动物食性。根据食物网中各营养级的相互关系,初步将这49种鱼划分为3个营养级:(1)草食性动物和杂食性动物,营养级分别为1.0~1.3级和1.4~1.9级。(2)低级肉食性动物和中级肉食性动物,营养级分别为2.0~2.8级和2.9~3.4级。其中,属于低级肉食性营养级的种类数量最多,共有30种;属于中级肉食性营养级的种类较少,共有12种。(3)高级肉食性动物,营养级为3.5~4.0级。属于该营养级的种类数量最少,只有7种。
From 1997 to 2000, 49 species of fish were collected from Beibu Gulf Fishery Investigation in the South China Sea, totaling 2 080 fish. According to the analysis of their feeding habits and according to the characteristics of their ecological groups and digestive organs, they are divided into five types of feeding habits: planktonic feeding habit, benthic feeding habit, feeding habit of swimming animals, plankton and benthic feeding habits, benthic habitat Creature and swimming animal feeding habits. According to the correlation of trophic levels in the food web, the 49 species of fish were initially divided into three trophic levels: (1) herbivores and omnivores, with trophic levels of 1.0-1.3 and 1.4-1.9, respectively. (2) Low-level carnivores and intermediate-level carnivores, with trophic levels of 2.0-2.8 and 2.9-3.4, respectively. Among them, the species belonging to the lower level of carnivorous nutrition have the highest number, a total of 30 species; there are 12 species belonging to the intermediate level of carnivorous nutrition. (3) Carnivorous animals, trophic level of 3.5 to 4.0. The number of species belonging to the trophic level at least, only seven species.