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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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