Dynamics of oocyte diameter in roach, Rutilus rutilus (Cyprinidae), during spawning season
Dynamics of oocyte diameter in roach, Rutilus rutilus, coming to the spawning grounds in the littoral zone of the Rybinskoe Reservoir has been studied. Comparative analysis of variation curves of oocyte diameter distribution in the spawners' groups has shown that as the ovulation approaches the amount of large oocytes increases. Mostly, the increase in large oocytes amount does not depend on female age, body length, or weight.