The aim of the study was to determine the impact of diet (natural and formulated feed) on the chemical composition and fatty acids profile of the harvested fish. The content of dry matter in fish flesh resulting from the formulated diet was higher vs. the natural diet (23.94?1.24 % vs. 19.66?0.82 %) with nitrogenous compounds (60.24?2.82 % vs. 72.12?1.75 %), total fat content (24.81?4.51 % vs. 6.14?2.85 %) and ash (7.55?1.28 % vs. 10.54?1.53 %) respectively. The spectrum of fatty acids was determined by gas chromatography using Varian 3800 equipment. Tench fed on a formulated diet in the recirculating system had a significantly higher content (P< 0.05) of monounsaturated fatty acid (MUFA = 43.04?1.68 %) and n-6 polyunsaturated fatty acids (PUFA = 15.47?1.07 %) in their flesh compared to the flesh of fish reared in earth ponds on a natural diet - MUFA (32?5.29 %) and n-6 PUFA (13.6?1.66 %). Tench fed on a natural diet in earth ponds proved to have a significantly higher content (P< 0.05) of n-3 PUFA (16.8?4.38 %) and ? PUFA (30.3 ? 5.3 %) than tench reared in the recirculating system - PUFA n-3 (10.05?0.85 %) and ? PUFA (25.52?1.07%). The ratio n-3/n-6 for fish from earth ponds was 1.2; for fish from the recirculating system the ratio was 0.65. The results show a significantly higher composition of n-3 PUFA in flesh of tench from earth pond with natural food compared to fish on an intensive feeding diet in the recirculating system which showed a higher content of n-6 PUFA.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:53753 |
| Date | January 2010 |
| Creators | PŘÍBORSKÝ, Josef |
| 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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