Study on the fish gathering effect of Longkaikou fish gathering and transportation system

Abstract

In order to understand the fish gathering effect of Longkoukou fish gathering and transportation system, eight target fish species were caught through regular operation of the fish gathering and transportation system. The results showed that the fish aggregating system had a good effect on aggregating schizothorax, but it was quite different from the monitoring result of the fish aggregating system in 2021. This indicated that in the same season, due to different influences of the surrounding environment, the fish aggregating system will have different effects on the same fish. The PIT experiment was conducted with Schizothorax wangchiachii, Schizothorax chongi(Fang) and Schizothorax prenanti as the main research objects, to study the effect of collecting fish after releasing in different parts of the collecting system. The results showed that during the experiment, 17 tagged fish were caught in the collecting hopper, 13 of them entered the collecting platform, and 23.08% escaped from the collecting platform. 8 tagged fish released at the entrance of the fish collecting platform entered the fish collecting tank, 9 fish stayed in the fish collecting platform, and the proportion of fish escaping from the fish collecting platform was 45.16%. Five tagged fish released at the foil entrance of the deep water net were detected to enter the fish collecting platform, and the uplink rate was 16.67%. The result show that the Longkou fish collecting system has a certain effect of collecting fish. The research can provide reference for the transformation of Longkou fish collecting system and the research on the effect of domestic fish collecting system.

Keywords

fish collecting platform / fish collection effect / PIT tagging