The depths of 10, 15, 25, 35, 50, 75 and 100 m were trawled by artisanal bottom trawler within the three-nautical-mile trawl prohibited area between Tungkang and Fonggang off southwestern Taiwan. Fishes were the main landing within the prohibited area, and shrimps were the second. For the number of species in the different taxon groups, there are 92 species of fishes. Carangidae is the most dominant, Leiognathidae is the second, and Apogonidae is the third among the family of fishes. and fishes is the most number of species among . Jacks, groupers, sweetlips, snappers, barracuda, and elopiform fishes are the main predatory fishes. Ponyfishes, sardines, ocean basses, lantern fishes, and cardinalfishes are main food fishes for predacious fishes. The others are demersal fishes like as grunts, terapons, hairtails, threadfin breams, and goatfishes.The fork lengths of the most predatory fishes were below minimum maturity sizes, however the others fishes have beyond minimum maturity sizes. For Carangidae, most species show deeper-bigger trends in body size. For Leiognathidae, the trends are species-specific. Sardines also show deeper-bigger trends with depth. However, most demersal fishes have no significant trends of body sizes with depth.