An experimental device for testing fish's water velocity preference

Abstract

The invention discloses a testing device for testing water velocity preference of fish. The testing device comprises a water tank. The testing device is characterized in that the water tank is internally sequentially provided with a current plate, a transparent transition water channel, a radial screen plate and a gradient water channel. The front portion of the current plate is further provided with a frequency conversion wave maker. The back portion of the gradient water channel is provided with a backflow device. The cross section of the current plate is divided into a plurality of even areas by more than two separating plates. The radial screen plate is internally provided with diverging thin tubes with thin walls. The gradient water channel is of a horn type with a small end and a large end. The diverging amplitude of the thin tubes with the thin walls is identical to the diffusing amplitude of the gradient water channel. A guide screen plate is sealed at the tail end of the gradient water channel. The middle portion of the guide screen plate is provided with an opening. The position of the opening is provided with a movable screen plate. According to the testing device, the influence of ecological factors like ground substances, water depth and lane width can be eliminated in the testing process, and the water velocity preference behavior of the fish can be measured accurately.

Description

technical field [0001] The invention relates to a device for testing fish behavior, in particular to a test device for testing fish's preference for water flow speed. Background technique [0002] Fish behavior is a subject that studies the external response of fish to internal or external environmental changes, and has important guiding significance for fishery production and fish resource protection. In a flowing water environment, fish need to swim continuously in order to maintain their position. In nature, water flow velocity varies greatly with time and space, and the change of water flow velocity is also accompanied by changes in intraspecific competition pressure, predation pressure and food resources. Therefore, the preference and choice of fish for a specific water flow velocity are crucial to their survival and reproduction. Important, related research has very important ecological significance. [0003] At present, domestic and foreign studies on fish water flo...

AI Technical Summary

Problems solved by technology

However, the change of water flow velocity produced by such devices is not uniform and continuous, it is difficult to control artificially, and it is often mixed with the interference of other ecological factors, such as substrate, water depth, swimming lane width, etc.

The limitations of these experimental setups can easily lead to reduced reliability and stability of experimental data, which is difficult for other researchers to replicate

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