Method for measuring fish critical swimming speed

Abstract

The invention belongs to the field of ecological environmental protection tests of water conservancy projects, and provides a method for measuring fish critical swimming speed. The method for measuring the fish critical swimming speed is specially adopted in the construction process of an ecological fishway. The method comprises the steps of the preparation of fish swimming measuring devices, arrangement of the fish swimming measuring devices in a test section, the testing process of fish critical swimming speed and statistics of test data. The method for measuring the fish critical swimming speed achieves testing of the critical swimming speed of small fishes such as cobitidae, and the small fishes such as the cobitidae can be helped to pass through the fishway after the speed measured by the method is adopted in design of the ecological fishway.

Description

technical field [0001] The invention relates to a method for testing the critical swimming speed of fish, in particular to a method for testing the swimming speed of fish used in the construction of an ecological fishway, and belongs to the field of ecological environment protection experiments in water conservancy projects. Background technique [0002] There are usually two test methods for the measurement of critical swimming speed: "fixed flow rate method" and "increasing flow rate method". [0003] (1) Fixed flow rate method [0004] In a fixed flow rate test, fish are generally placed in a constant flow rate that does not vary throughout the test. Allow the fish to acclimatize for a period of time in the tank, then suddenly or semi-abruptly increase the flow rate to the test required. This increase in flow rate is to be completed within the specified time. This procedure is repeated several times with different submaximal flow rates. In the fish swimming ability te...

AI Technical Summary

Problems solved by technology

It is generally believed that the measurement results of the two methods cannot be directly compared

[0011] The critical swimming speed is mainly used as a prediction test for the continuous swimming time test, and its results are mainly used for the selection of the flow rate value of the fish's continuous swimming time test. Critical swimming speed often cannot be directly applied in ecological fishway design

For example, for loach fish, due to their small size, they often need objects such as pebbles to cover themselves during swimming and obtain a rest space. The existing critical swimming speed test cannot meet the needs of such fish

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