Differences between the effects on reproduction in carp Cyprinus carpio (L.) of Yugoslavian strain J and Hungarian strain 0 after stimulation of ovulation with carp pituitary homogenate or ovopel.

The effects on reproduction were investigated in carp of the Hungarian strain 0 and the Yugoslavian strain J after CPH or Ovopel tratment. After hypophysation eggs were obtained from a similar percentage (~85%) of fish in both strains while after the Ovopel treatment from 100% of females in strain 0 and 50% in strain J. Interaction between the preparation and the provenance of the fish was statistically significant (P ≤ 0.05) for the weight of eggs (in grams and in percentage of female body weight). The highest weight of eggs was obtained after Ovopel treatment of females of strain J and the lowest after CPH application to fish of the same strain (1042.98 g, 15.60% and 746.49 g, 10.97%, respectively). The statistical significance (P ≤ 0.01) of the interaction was noted too for the fertilization percentage; the lowest quality characterized eggs obtained from females of strain J treated with CPH and the highest for eggs of the same strain treated with Ovopel (95.80% and 98.20%, respectively). The effect of latency as an important factor of quality of the eggs obtained after ovulation induction with CPH and with Ovopel from females of the strain 0 was determined. The comparison of reproduction effects of the investigated breeding strains of carp showed that these strains differently respond to the ovulation stimulators applied. RÓŻNICE W EFEKTACH ROZRODU KARPIA CYPRINUS CARPIO (L.) JUGOSŁOWIAŃSKIEJ LINII J ORAZ WĘGIERSKIEJ LINII 0 PO STYMULOWANIU OWULACJI HOMOGENATEM PRZYSADKI KARPIA LUB OVOPELEM Elżbieta Brzuska Zakład Ichtiobiologii i Gospodarki Rybackiej w Gołyszu Polska Akademia Nauk S ł o w a k l u c z o w e: stymulowanie owulacji, linie karpia, homogenat przysadki karpia (CPH), Ovopel. Address: Elżbieta Brzuska, Polish Academy of Sciences, Institute of Ichthyobiology and Aquaculture in Gołysz, ul. Kalinowa 2, 43-520 Chybie, Poland, phone: +48 (33) 853 37 78, e-mail: urszula.karosek@fish.edu.pl