一、前言海洋食物链是海洋生物之间相互关系的一种表现方式。它由若干营养级构成。在海洋生态系统中,一种生物为另一些动物所摄食,而一种动物又可以摄食多种生物。海洋生态系统中各食物链相互紧密地连结在一起,形成错综复杂的食物网。软骨鱼类无例外的都是食肉性的动物,或者直接捕食其他经济鱼类,或者消耗其它的鱼类的饵料,如贝类、甲壳类以及人工培养的经济贝类。凶猛贪食的板鳃鱼类位于食物链的最后一个环节,被其消耗的能量最大。因此不少学者曾提出加强食物链中最后环节的捕捞,即大力 I. INTRODUCTION The marine food chain is a manifestation of the interrelationship between marine organisms. It consists of several trophic levels. In the marine ecosystem, one kind of creature is consumed by other animals, and one kind of animal can ingest many kinds of living things. The food chains in the marine ecosystem are closely linked to each other to form an intricate food web. Cartilaginous fish, without exception, are carnivorous animals that either feed directly on other economically fish species or consume other fish species such as shellfish, crustaceans, and artificially cultured economic shellfish. Fierce bulimia gill fish in the last part of the food chain, it is the largest energy consumed. Therefore, many scholars have proposed that the last link in the food chain should be harvested, that is, vigorously