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在南沙岛礁周围水域收集了43种主要鱼类,共940个胃含物,根据对它们的食性分析,并依其食料生物的生态类群以及消化器官特点,一般可划分为浮游生物食性、底栖动物食性、游泳动物食性、浮游生物兼底栖动物食性、底栖动物兼游泳动物食性等5种食性类型。根据食物网中各营养级的相互关系,初步划分为4个营养级,即初级生产者(海洋植物)、草食性动物和杂食性动物、低级肉食性动物和中级肉食性动物、高级肉食性动物。并根据这些营养级的划分,南沙岛礁周围水域43种主要鱼类可分低级肉食性鱼类,中级肉性鱼类和高级肉食性鱼类,它们的比为28105。灰裸顶鲷是南沙岛礁周围水域三重剌网举足轻重的捕捞对象,从食物网的观点出发,应加强灰裸顶鲷幼鱼期敌害鱼和其竞食者的捕捞,为低级肉食性经济鱼类除害,灰裸顶鲷就有可能增加资源量。
Based on the analysis of their feeding habits and the ecological characteristics of the food organisms and their characteristics of digestive organs, 43 major fish species and 940 stomach contents were collected around the waters around the Nansha Island reef, which were generally divided into planktonic feeding habits, Habitat feeding habits, feeding habits of swimming animals, plankton and benthic feeding habits, feeding habits of zoobenthos and swimming animals. According to the interrelationship of trophic levels in the food webs, the four trophic levels are initially divided into four trophic levels: primary producers (marine plants), herbivores and omnivores, lower carnivores and intermediate carnivores, . According to the classification of these trophic levels, the 43 major fishes in the waters surrounding the Nansha Islands can be divided into low-level carnivorous fish, mid-level flesh fish and high-level carnivorous fish at a ratio of 28105. Grayhead bream is a key fishing destination in the area around the Nansha Island reef. From the point of view of the food web, the fishing of predatory fish and their captives should be strengthened during the juvenile stage. Fish removal, gray bream may increase the amount of resources.