The Research of the Relationship Between Variations of the Fish Fauna and Water Quality of The Reservoir A Study of Feitsui Reservoir in Taiwan
Date Issued
2007
Date
2007
Author(s)
Wang, Chen-Kuang
DOI
zh-TW
Abstract
The fish contains the wide ranges of nutrition and is located at the high level of the food chain of the aquatic, so the fish has close relations with the change of water quality. Feitsui Reservoir is one of the important collection watersheds in the north of Taiwan. It have had successively biology monitored plan successively since 1988, but reported no researches of relation between fish and water quality after 2000. The object of this study is to investigate the varieties of the fish and study the relation between the variations of fish mass and water quality in order to offer one of the sustainable use references for the Feitsui Reservoir administrations.
For the investigation of fish in Feitsui Reservoir watersheds are had divided into the the two parts areas study including the Feitsui reservoir upstream tributaries of Beishih, Daiyujyue and Jingualiao respectively. The former sampling fish is used gill net and the latter is used composite method to fish. Calculating the density of fish makes use of Moristia index, percentage of weight and number, respectively, we studied the composition of the fish during 2006/6~2007/5 compared to the tendency of the fish variations over the years in the study areas. We research the relation between the variations of fish number and water quality in different streams with analyzing the correlation with six parameters, including the weight, density and index of biotic integrity of fish, total phosphorus, chlorophyll-a, transparency of eutrophication factors per month.
The result of this study shows that percentage of catching weight from the original dominant species of larger cyprinids, Sinibrama macrops, Carassius cuvieri six years ago, were lower than that prior to 2000 obviously and Culter erythropterus and Oreochromis sp. have replaced Carassius cuvieri to become the new dominant species in Feitsui Reservoir. In the small size fish, the number of Sinibrama macrops and Hemiculter leucisculus is the highest. In the first time, Hemiculter leucisculus and Oxyeleotris marmoratus are the new non-native species in Feitsui Reservoir, 2006. The larger cyprinids Sinibrama macrops, Cyprinus carpio carpio, Carassius cuvieri have the higher correlation with chlorophyll-a in spring, summer and autumn separately. This phenomenon possibly comes from the feeding habits. According to analyzing the feeding habit of Culter erythropterus in 2006, Cyanobacteria getting up to 91% was the staple of the original carnivorous Culter erythropterus diet, and we presume that feeding habits of fish will change with water quality in different regions. The result of index of biotic integrity in reservoir showed that the index was higher than 2000, and the cause was that the species of carnivorous fish is increasing gradually.
The ecosystem may be produced and changed gradually due to the raising of non-native species during 2000~2006. We propose that the monitoring of variation in the condition of fish should be carry out continually, and establish the continuous, correlative information between fish and water quality.
Subjects
翡翠水庫
生物控制法
魚類密度
水質優養化
生物整合指數
Feitsui Reservoir
biomanipulation
fish density
eutrophication
index of biotic integrity
SDGs
Type
thesis
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