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Comparison of different ways of breeding, nutrition and controlled reproduction of Lota lota
ZÁVORKA, Milan
Based on the results reached after 216 days of experimentation with various breeding types, it can be said that the type of feed is not of paramount importance. This fact is based on the previous adaptation of submitted food, this is especially important for artificial feed. From our point of view, the more important factor is temperature, intensity and method of breeding. Prey selections choices involving 11 species of fish were performed on age groups of different burbot. All groups of burbot preferred the following species: grass carp, pikeperch, tench and stone moroko. The non-preferred species was ruffe. And different preferences were set for common carp, silver carp, burbot, sunfish and also for roach. The study evaluated reproductive parameters in burbot (Lota lota ) and focused on incubation time in two localities. Burbot spawning was observed from January to early February at an average temperature of 1.55 +- 0.9 °C in Borova Lada and 4.78 +- 0.11 °C in Mydlovary. For burbot at the age of 2+, at an average 1166 +- 100 were determined number of swollen eggs per gram. Relative fecundity was at 257260 +- 70678 eggs per kilogram of female. The absolute fecundity was at 24232 +- 6753 eggs.The last parameter evaluated was the incubation period. The average incubation period in the years 2020-2022 was 202 +- 24.55 °D in Mydlovary and 75.8 +- 16.67 °D in Borova Lada. In connection with artificial spawning, in this study, we further point out the possibility of peeling artificially spawn eggs with NaClO, in which we did not observe a negative effect.
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Reproduction Burbot burbot (\kur{Lota lota}) and incubation of eggs at different temperatures in service
MIKEŠOVÁ, Lucie
The study evaluated the reproductive performance in Burbot burbot (Lota lota L.) and compared the incubation period at two locations. It was confirmed that the burbot wipes at the end of December and beginning of January with an average temperature of 1,93 ? 0,8 ° C. It was found that the content of the eggs in one gram is 3325 ? 248 pieces eggs and 1 ml is 1434 ? 24 pieces of eggs. Also, to evaluate the size of eggs before and after swelling. Size before swelling was 0,814 ? 8 mm and the swelling 0,838 ? 7,1 mm. Further, the absolute and relative fecundity and GSI, the absolute fecundity was 289,279 ? 204,759 pieces of eggs, the relative fertility of 763,523 ? 110,061 pieces of eggs per kilogram of body weight of fish and GSI was 23,15 ? 3.9%. The last parameter was rated incubation period. The incubation period was Vodňany 178,4 ° D and Borových Ladách 145,4 ° D.
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