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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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Vliv krmení raného plůdku jesetera malého \kur{(Acipenser ruthenus)\kur{}} obohacenými naupliemi žábronožky (r. \kur{Artemia\kur{}}) na jeho růst a přežití
VOLSKÝ, Jan
The aim of this study was to evaluate the effects of enrichment of Artemia on biometrical parameters and survival rate of sterlet larvae (Acipenser ruthenus). This kind of diet was succesfully used for some type of fish (Sturgeon,Cod, Bass). The theoretical part of the study is focused on using live feed for rearing fish larvae. Second part of the theoretical part of study is focused on current status of rearing fish larvae of sterlet. Experimental part of the bachelor thesis includes realizing an experiment of rearing sterlet larvae in recirculation system. Experiment includes 2 - 3 different kind of feed. The groups differed in the type of food and duration of live feeding. Fish larvae were fed non-enriched Artemia (control group), enriched Artemia with commercial emulsion Red Pepper and Artemia enriched with emulsion Olio3, always in 3 replicates. The duration of live feeding was 7 and 14 days before weaning to dry granulated food. Feeding was carried out 7 times per day. |The temperature of water will be in optimal rates for this type of fish (18 - 22 °C). The death will be recorded duringthe experiment. The duration of feeding is 21 - 30 days. During the experiment will be realized 4 controlled measurement. The Monitored parametres will be wet weight,growth (different variants), condition parametres, survival, canibalism. All parametres will be statistically tested.
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Odkrm plůdku lína obecného (Tinca tinca) s využitím obohacených nauplií žábronožek (r. Artemia)
BOŇKO, Dominik
The aim of the experiment was investigate the the effect of feeding early Tench fry with enriched Artemia nauplii on the survival in the under laboratory conditions at an average water temperature of 25.8 °C. The total duration of the experiment was 42 days. We used two commercial enriching products of Selco company (Selco DHA and Selco Spresso). The fry were fed with this diet in two variants (7 and 21 days), followed by a transition to dry starter feed. In the experiment were also included control groups fed with unenriched nauplia (also for 7 and 21 days). The transition to starter feed (Inicio Plus GR from Biomar) was done after a four-day co-feeding, when the proportion of nauplia was gradually reduced. Groups fed with naplii for 7 days had a higher growth rate (13.41 %-d-1), an average individual weight (142.74 +- 57.06 mg) and a total length (21.08 +- 3.27 mm), including higher variability of the two last parameters. At the same time, low survival (2.8 %) was observed. Produced biomass was also lower. Fry fed with live feed for the first 21 days had lower growth rate (10.77 %-d-1), individual weights (48.61 +- 18.13 mg) and total length (16.05 +- 1.66 mm). Survival of fry was much higher (25.1 %) in this case. Produced biomass of the fry fed with live food for three weeks was almost three times higher (219.3 g) than biomass of the fry fed with live feed for one week (71.4 g). It can be observed that the influence of enriching of the artemia nauplii on the growth of the tench fry wasn´t proved. However, fry fed a week of enriched nauplii reached a slightly higher survival rate during the rearing period. Compared with the control group (3.3 %), the survival rate of the fry fed with live food enriched of Selco Spresso was 3.7 % . The survival of Selco DHA was 1.4%. Reached results could be partially influenced by parasitic disease of the fry during rearing.
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