A method for estimating the scale of spawning grounds of fishes that lay viscous eggs in rivers

Abstract

The invention provides a scale estimation method for a spawning ground of river fishes capable of laying adhesive eggs. According to the scale estimation method, a spawning ground scale T is estimated according to an investigation object population total number S, a sexual maturity individual number ratio P1, a reproductive population female number ratio P2, a after-egg laying individual ratio P3 and a relative fish brood amount R; and the spawning ground scale T is equal to S*P1*P2*P3*w*R. According to the method provided by the invention, fishing investigation is combined with fish population growth and death parameter estimation, and reproductive biology parameters; and the scale estimation problem of the spawning ground of the river fishes capable of laying the adhesive eggs is solved, so that the difficulties that area of an egg laying region and fish egg density and the like underwater are difficult to count, and equipment cannot develop the work while the equipment does not meet the requirements are avoided.

Description

technical field [0001] The invention relates to a method for estimating the scale of a spawning ground, in particular to a method for estimating the scale of a spawning ground for river fish that lay sticky eggs. Background technique [0002] Due to overfishing, water pollution, dam construction, sand excavation and other reasons, the freshwater fish resources in rivers have shown a sharp decline in the past few decades. An important reason for the change of fish resources is the loss or destruction of habitat environment. The fish spawning ground is an important and sensitive place in the fish habitat. It is an important place for fish to spawn and reproduce, and it is related to the reproduction of fish populations. Therefore, the investigation and research on the location and scale of fish spawning grounds is also the focus of fish conservation ecology research, and it is also the focus of current wading projects. [0003] Different fish have different reproductive habi...

AI Technical Summary

Problems solved by technology

But for sticky and sinking egg-producing fishes (such as carp, crucian carp, spotted carp, etc.), most of them are sedentary fish, and fish eggs usually adhere to aquatic plants, gravel or rocks in living waters, so it is very difficult to It is difficult to estimate the scale of its spawning ground, which is why there are basically no reports on the scale of spawning grounds of sticky and sinking egg-producing fishes