Zbigniew Dobrza�ski1, Piotr
Bykowski2, Zbigniew Iwaniuk3,
Zygmunt Usydus2,
Helena G�recka4 and Tadeusz Trziszka1
1Agricultural University of Wroc�aw,
Marii Sk�odowskiej-Curie 42, 50-369 Wroc�aw, Poland
2Sea Fisheries Institute, Kołłątaja
1, 81-332 Gdynia, Poland
3"Agro-Fish" Ltd.,
84-111 Karlikowo, Poland
4Wroc�aw University of Technology,
Smoluchowskiego 25, 50-372 Wroc�aw, Poland
Key words: fish oil, chemical composition, organic-inorganic contamination.
Abstract.
This study evaluated the chemical properties of fish oil derived from the fish
processing industry. Its manufacturing technology was jointly developed by the
Sea Fisheries Institute in Gdynia and Big-Fish Ltd. in Gniewino. The acid contents
of this oil are as follows: unsaturated fatty acids n 82.72%; polyunsaturated
fatty acids n 35.59%; omega-3 - 17.04%; Cl - 0.23%; Ca - 0.047. The following
are also present (in mg/kg): Mg - 24.6; Na - 37.57; P - 51.8; Zn - 220; Fe -
15.33; Al - 14.43; Se - 7.62. Twenty other trace elements are found in this
product. Vitamins are present in the following concentrations (in IU/g): A -
458; D3 - 240; E - 1.21. The concentrations of organic chlorine pesticides,
polychlorinated biphenyls and toxic metals (As, Cd, F, Hg, Pb) were within permissible
ranges. This fish oil meets the general criteria for animal feed ingredients.
It is, however, essential to determine its optimal nutritional rations.