Because the ecological environments of fishing grounds in the southwestern waters ofTaiwan have been acutely destroyed and overfishing, the fish resources of trawl fisherywere distinctly exhausted. The catchable stocks are gradually decreasing and the fishingconditions of trawlers are steadily worse.To understand the status of fish resource of trawl fishery and to solve the difficulties oftrawler operation, these experiments were carried out. It is needed to study monitoringand stock assessment on trawl fishery resource in the southwestern waters of Taiwan.These investigated data will provide the fishery administration a basis for establishingthe management policy for trawl fishery.This program is divided into the following four main subjects: (1) understanding theactual operating state of trawl fishery, (2) analyzing the construction of fishing groundsand the change of fishery resources, (3) studying the biological characteristics of fishes;(4) establishing the database of the fishes. It is expected that this study will beconcentrated on effective assessment of the stock, establishing the productive model ofthis fishery. The research results will be offered to management regime to develop thisfishery of southwestern Taiwan.