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一、序在以治水或兴利为目的修建水工建筑物中,为保护水产资源,必须同时设置各种渔业工程。例如:为防止鱼类迷入坝和堰的取水口而建的拦鱼工程,为鱼类能够洄游而建的鱼道,或者为鱼类提供避难场而设置的鱼巢等。日本在东北部北海道设置的鱼道,大多数以通过鲑、鳟为主,而其他地区设置的鱼道大多以通过香鱼(Ayu,Japanese tzout,Plecoglssusaltivelis)为主.由于日本的鱼道设计以欧美的理论为模式,因而无论哪种鱼道,都不能充分地发挥作用。
First, preface In the construction of hydraulic structures for the purpose of water control or improvement, in order to protect aquatic resources, various fishery projects must be set up at the same time. For example, fish-catching projects designed to prevent fish from entering the water intake of dams and weirs, fishways that migrate for fish, or fish nests to provide refuge for fish. Most of the fishways in Japan set up in Hokkaido in the northeast are salmon and trout, while most of the other fishways are mainly made of sweet fish (Ayu, Japanese tzout, Plecoglssusaltivelis) Europe and the United States as a model of theory, so no matter what kind of fish, can not fully play its role.