Abstract: The pressnt paper is based upon the analysis of food habits of fishcs in Minnon-Taiwanchiantan fishing ground.There are 66 species of the marine food fishes of which 1,978 digestive-tract contents were examined.According to their dietary habits,these fishes may ba separated into 5 types:planktivorous fishes,benthophagous fishes,nektivorous fishes,planktivorous-benthophagous fishes and benthophagous-nektivorous fishes.The morphological structures of digestive organs are generally correlated with the types of their food habits.The consumers can be divided into 3 trophic levels,namely,(1) herbivores,comprisink also omnivores,(2) lower carnivores and middle carnivores,arid (3) higher carnivores,Most of these fishes belong to the lower carnivores.Principal pathways of energy flow in the food web of fish's hsve been summarized.In order to retain the maximum sustainable yield of the lower carnivorous fishes,such as Parargyrops edits,it is necessary to increas:the fishing intensity of the higher carnivorous elasmobranchs.Gastrosaccus hibii,Leptochela gracilis and Bregrraaceros macclellandii,the main food of the p0lzoic fishes,may possibly be used as a biological indicator for searching the fisiinL csnter,this is of considerable significance in practice.