THE EFFECT OF APPLICATION OF NEW SPAWNING AGENTS IN ARTIFICIAL REPRODUCTION OF WILD COMMON TENCH, TINCA TINCA (L.)

摘要

The aim of this study was compare the results obtained after testing new spawning agents (Ovaprim and PG-600) in artificial reproduction of common tench in comparison to Ovopel, the spawning agent, which worked very well in this species. The tench spawners were collected from open waters. After catching, the selected fish were transported to the hatchery, where the fish were treated with the spawning agents: Ovopel at 1 pellet kg(-1) Ovaprim at 0.5 ml kg(-1) or PG-600 at 600 IU kg(-1). The fish from the control group received saline (0.9% NaCl). The best parameters recorded during the artificial reproduction, such as the percentage of ovulated females and embryo survival at the eyed-egg-stage were obtained in the group treated with GnRH analogues. In general, the obtained results indicate that all of the tested spawning agents might be used on successful tench artificial reproduction. However, after application of Ovopel better results were recorded.