Abstract
The difference on the fishing performance of a bottom gillnet and semi-trammel net was elucidated by evaluating the catching efficiency and absolute selectivity of the nets. The data were obtained from an outdoor water tank experiment using a group of rainbow trout Oncorhyncus mykiss of known size composition. The influence of light intensity on the catch taking the mesh size and construction of the net into consideration was also evaluated. The results showed that gillnet was more effective than semi-trammel net when the mesh size of the net was appropriate with the size of fish. Likewise, light has greater influence to the catch of semi-trammel net than a gillnet.
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