Indoor test device for researching fish cluster effect

Abstract

The invention discloses a test device for indoor research of fish cluster effect, which comprises a water tank 1, a fish blocking net, a propeller propulsion group, a motor group, a camera group, a damping grid and a flow separation plate 21, a water guide wall 4 with two open ends is arranged in the water tank 1, and the water tank is divided into a water flow circulation open channel 5 and a simulated river channel 6; the simulated river channel is divided into a test area 11 and an adaptation area 12 by the fish blocking net; the propeller propelling set is installed at the open end of the water tank downstream water guide wall 4 and connected with the motor set. The camera group is positioned right above the simulated river channel test area 11; and the two rectifying grids 18 and 19 and the positions without the rectifying grids are matched with the flow isolating plate together, so that the test area 11 forms a low-flow-speed area 22, a medium-flow-speed area 23 and a high-flow-speed area 24 along the water flow flowing direction. The method has a good simulation effect on the natural river channel, the stress effect on fish schools is greatly reduced, and the continuous swimming speed, the critical swimming speed and the burst swimming speed of the obtained fish schools are closer to the real situation of the natural river channel.

Description

technical field [0001] The invention belongs to the technical field of test devices for simulating the influence of environmental hydraulic changes on fish colony effects, in particular to an indoor test device for studying fish colony effects. Background technique [0002] Most of the world's fish are gregarious fish, and studies of fish school behavior and evolution have shown that swarming is beneficial to individual fish, resulting in reduced risk of predation, easier access to food resources, and better mate selection. And reduce energy consumption, improve the efficiency of information transmission. [0003] There are three main indicators to evaluate whether fish are clustered, namely cohesion index, coordination index and repulsive force index. Among them, the cohesion index includes the centroid of the fish school, the distance between the nearest neighbors, the cluster area, etc., which mainly evaluates whether the individual fish has a tendency to approach the ne...

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Problems solved by technology

[0006] Although the above devices can all be used to study the behavior of fish, and can also make the water flow in the water tank have different flow rate gradients, but on the one hand, these devices are small and have a strong coercive effect on fish schools. The water flow division is not obvious, especially the flow state is not uniform in the vertical direction, and the flow state of the natural river is not simulated, so the indicators of the fish colony effect obtained are not accurate

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