Fish Biomass and Habitat Utilization of Cigu Estuary in Southwestern Taiwan
Date Issued
2011
Date
2011
Author(s)
Lu, Cheng-Ta
Abstract
Cigu estuary located at southwestern Taiwan, formed by mangrove sandbar, with rich in biological resources. Many fyke nets surrounding estuary and lagoon area were set up by local fishermen. The main purpose of this study is to estimate local fyke net fishery resources ,fish biodiversity, fish guilds construction and offer fishery management suggestion. The study sampling was carried out from November, 2008 to October, 2009. Three fyke net sampling sites was randomly chosen, data was collected monthly. The results showed total 1975 individuals was sampled, belonging to 34 families 49 genera 63 species. About 93% of total individuals the length frequency is located in the scale 1-20cm, and nearly 90% of all individuals the weight is below 60g. Most of smapling fishes are smaller size. Cigu site and cross site have closely fishery estimated resources and variation transcend, the other lagoon site is differ from them. But three sites have a higher peak performance during August to November. The year estimated fishery resource have highest performance in lagoon site, followed by intersection site, and Chigu River site at least. Five Biological diversity index was used to describe the fish data. Showing a higher value in species richness index indicating that fyke net, not to catch a specific species; diversity index is higher, indicating fyke net can catch various of fish species. Finally, the homogeneity index is higher, said the fyke net catch is not focus on dominant species. In other words, Cigu River estuary fyke net catch, not for a particular species, but various of species. In this study, the concept of guilds was used to separate all the fish species.All species was divided into four groups: straggler (S) type up to 23 species, followed by marine (M) type 19 species, estuary common (E) type 16 species,and the least occational opportunity (O) type 5 species. The advise of fyke net fishery resource management can be divided into three groups: availability of fishery resources occational opportunity guild. Partually use of fishery resources estuarine common fish guild and marine guild. Non-fishery resource is straggler guild.
Subjects
Cigu River
estuary
Fishery resource
Biodiversity
Habitat utilities
Biomass
SDGs
Type
thesis
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