Artificial spawning of European catfish Silurus glanis L.: differences between propagation results after stimulation of ovulation with carp pituitary and Ovopel

E Brzuska-2001

Aquaculture Research, 32 (1): 11-19

Abstract:

The effect of spawning on European catfish females with an average body weight of 5.6 kg and 11.2 kg was investigated, with carp pituitary and Ovopel being used as ovulation stimulators. Ovopel induced ovulation in a higher percentage of females of both smaller and larger body weight. The applied ovulation stimulators did not significantly affect the weight of the obtained eggs. On the other hand, the effect of the stimulators was highly significant (P£ 0.01) with respect to the percentage of live embryos after 24-, 48- and 56-h incubation. The fish of greater body weight yielded eggs of a significantly (P£ 0.05) greater weight, although of poorer quality. The interaction between the ovulation stimulator and female body weight was statistically significant (P£0.05) for the weight of the obtained eggs and highly significant (P£ 0.01) for the percentage of live embryos after 48-h incubation. For the percentage of live embryos after 24- and 56-h incubation, the statistical significance (P£ 0.05) of this interaction was determined. In the case of females of smaller body weight, a statistically significant (P£ 0.05) phenotypic correlation was found between the percentage of live embryos after 24-h incubation and that after 48-h incubation, and also between the percentage of live embryos after 24- and 56-h incubation.

(Polish Academy of Sciences, Institute of Ichthyobiology and Aquaculture, Golysz, 43-520 Chybie, Poland)

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