Fecundity of Chub (Leuciscus Cephalus L.) in the Middle Stream of Iskar River as Compared to Other European Habitats

ABSTRACT

In this study we critically survey methods of comparative studies of fish fecundity which have been most often used in studies described in East-European literature. We suggest a way which is more precise and suitable for this purpose (illustrated with an example of 5 populations of the chub (Leuciscus cephalus L.) from its range); and on this basis, we try to reveal certain peculiarities and regularities in the variation in chub's fecundity.

Keywords:

• chub
• fecundity
• Iskar river