Pond harvesting is an integral part of fish farming procedures in pond culture and overall fish production. This study was aimed at the evaluation of environmental conditions during pond harvesting, based on the comparison of values monitored in the trawl-net with fish located in a harvesting pit and outside it. The monitored parametres comprised the oxygen content and saturation, temperature, pH, conductivity and turbidity. The monitoring was performed on three autumn harvests (Potěšil, Rod, Jaroslavický dolní) and two spring harvests (Vrbenský přední and Vrbenský nový), always during the fish removal from the net (seine). The monitored determinants were recorded in 30-min intervals inside the net with fish and outside it in 15m distance. During the statistical comparision of the oxygen content and saturation in the net and outside it with the count on fish biomass was statistically signifiant differences in the four of twelve raids evaluated, which means keeping fishes in the net during the yielding was adequately treated by installation of fresh water jet.When the fresh water jet had been stopped worsen of the conditions in the fish net and even in the harvesting pit appeared.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:137496 |
| Date | January 2012 |
| Creators | PAVLÍČEK, Michal |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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