Illustration of stocking ratio of silver carp and bighead carp in reservoir by their capture data

It is a common method to adjust the stocking ratio of silver carp and bighead carp in lake or reservoir only by comparing their mean body weight or mean body length. But the method is based on omitting the natural difference in growth rate and the effect of fishing method and its intensity on their natural growth. The paper presents a method and standard on scoring the stocking ratio of silver carp and bighead carp. Applied the method to the scoring of the ratio in Dahuofang reservoir, this method shows that the ratio of silver carp to bighead carp is higher than the proper; the fishing method is improper.