Experimental method and device for determining curve for adaptability to current speed of fish habitat

Abstract

The invention provides an experimental method for determining the curve for the adaptability to the current speed of a fish habitat. The experimental method comprises the following steps: constructing a water tank provided with annular channels with the widths thereof being gradually varied, so as to form the current state of which the current speed is gradually varied in the annular channels; and observing the growth conditions of experimental fishes in the areas with different current speeds after stocking the experimental fishes, so as to construct the curve for the adaptability to the current speed of the fish habitat. The invention further provides a device for determining the curve for the adaptability to the current speed of the fish habitat. The device comprises the water tank, wherein a partitioning wall is arranged in the water tank; the extended line of the partitioning wall and the lateral edge of the water tank form a certain included angle; the partitioning wall divides the areas in the water tank into the ring-shaped channels; a power unit is mounted at one end of the annular channel; and a slot matching a moveable blocking net is formed on the wall of the water tank. The device and the method provided by the invention are capable of rapidly and accurately providing the curve for the adaptability to the current speed of the fish habitat and have the advantages of simple method steps, convenient operation and low cost.

Description

technical field [0001] The invention relates to a laboratory method and device for determining a flow velocity suitability curve in a fish habitat. Background technique [0002] At present, the biological habitat method is one of the main methods for calculating the ecological water demand of rivers. In this method, the determination of the flow rate suitability curve of different biological habitats is the key. In the flow rate suitability curve, the fitness value between 0 and 1 represents the influence of habitat factors (water depth, flow rate, substrate, etc.) If it is 1, it is assigned a value of 0 if it is the most unsuitable for fish species to survive. The degree of fitness is the biological basis of the IFIM method, and the authenticity and accuracy of its simulation play a key role in the success of habitat simulation. [0003] There are three main methods to determine the flow velocity suitability curve of fish habitats that are commonly used: ①Expert opinion a...

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Problems solved by technology

[0004] Among the above methods, although the expert opinion and historical literature method are derived from authoritative experience, the cost is small, and the information feedback is timely, the results are related to factors such as the richness of experience of the experts, the accuracy of subjective judgments, and the accuracy of literature records. Certain subjectivity; the latter two methods require a large number of field surveys, which have the disadvantages of long cycle, heavy workload, high cost, and the accuracy is affected by the number of samples.

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