| Summary: | 碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 103 === Paramisgurnus dabryanus also known as the Chinese loach (Lin et al. 1991), is a common fresh water fish that can be found all around Taiwan but little information is known from it. It belongs to the Cobitidae family, can be found habiting paddy fields and is usually mixed and confused with the Misgurnus anguillicadatus.
Loaches uses paddy fields to reproduce, nursery ground and obtain food, in other words paddy fields are part of their life cycle. Due to the modern drainage systems, the connection between paddy fields, irrigation ditches and creeks has been lost. As a result of this, the population of fish started to decline. In order to restore back the connection between this features, a fishway is needed. The fishway material chosen for this study was that of corrugated high-density polyethylene pipe or HDPE pipe, a cheap and easy to use kind of pipe. The purpose of this experiment is to provide the best combination of angles and discharges to build a fishway using corrugated HDPE pipe having Paramisgurnus dabryanus as the target species.
During this experiment, fishes where tested in a variety of angles and discharges to see which combination suited them the most. It was found in this experiment that different angles, different slopes, gender and age class had influence on the success percentage. After this, the experiment was taken and tested in the field at Taiwan, Yilan County, Yuan-shan district, Dahu area. The loaches were successful for the upstream migration during the indoor experiment as well as the field experiment.
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