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Provozní ověření vlivu krmení raného plůdku jeseterovitých ryb obohacenými naupliemi žábronožky na jejich přežití a rychlost růstu
STARÝ, Jakub
The purpose of the experiment was to verify of the influence of enriched artemia salina on the growth and survival of American paddlefish larvae (Polyodon spathula) in operating conditions. The control group was compared with group which was fed by artemia enriched by preparation Red pepper. Control group was fed by nonenriched artemia. This preparation contained increased amount of vitamins A, C, D3 and E, but especially HUFA, mainly DHA (docosahexaenoic acid). The larvae were fed by artemia only one week and then they were fed gradually by dry mixture for larvae. After a five-day co-feeding they were fed only by dry mixture for larvae. The whole experiment was 4 weeks. In the group which was fed by enriched artemia was statistically higher average weight (247.80 +- 40.36 mg) and average length of body (31.19 +- 1.03 mm) versus the control group. Average weight of control group was 140.76 +- 23.06 mg and average lenght of body was 25,27 +- 0.73 mm. Also average survival of the two groups was statistically different at the end of the experiment. The group which was fed by enriched artemia demonstrated an average survival 15.43 +- 2.90 %, while the control group only 2.20 +- 1.92 %. Only rate of cannibalism was not influenced by enrichment of artemia. But these results, mainly survival was negatively influenced by Ichthyophthirius multifiliis, which was detected on the skin after five days of the experiment. Another parameter was average amount of individual fatty acids in the body of larvae from both groups. In the group which was fed with enriched artemia was found statistically higher level of LA (linoleic acid), LNA (-linolenic acid) and DHA. On the other hand, higher levels of ARA (arachidonic acid), EPA (eicosapentaenoic acid) and DPA (docosapentaenoic acid) was found in control group.
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