于桥水库鱼类年龄、生长与繁殖

THE AGE, GROWTH AND REPRODUCTION OF FISHES IN YUQIAO RESERVOIR

The age, growth and reproduction of 26 fish species found in Yuqiao reservoir were examined during September 1987 to September 1988. The vertebral bones and scales of total 1049 individuals of fish were analyzed for the identification of their ages and body lengths. The spawning times, absolute fecundities, age structures of breeding population, and spawning types of fish were also studied. It has been found that the spawning times were mainly in spring (March to May)and summer (June to August); different species of fish varied largely in their age and fecundity; and there was not a complete consistence in the age structures of breeding population for different species of fish. There were 3 types of spawning habit, the first type is for the species such as Pungitius sinensis and Ctenogobius giurinus-, the second type is for the species such as Hemiculter leucisculus and Mastacem-belus aculeatus; and the third type is for the species such as Cyprinus carpio (L.).