Malondialdehyde (MDA) in Trout Tissues (Oncorhynchus mykiss, Walbaum) in Case of Feeding with High Oxidized Lipid Diets

Trakya University, Faculty of Veterinary Medicine, BG-6000 Stara Zagora, Bulgaria


DASKALOV, H. and T. M. GEORGIEVA, 2002. Malondialdehyde (MDA) in trout tissues (Oncorhynchus mykiss, Walbaum) in case of feeding with high oxidized lipid diets. Bulg. J. Agric. Sci., 8: 439–444

A case of clinically manifested Hepatic Lipoidosis (HL) was registered in intensive reared rainbow trout (Oncorhynchus mykiss, Walbaum). The disease was provoked by prolonged use (four months) of diet with highly oxidized lipids. Some fish in pools had clinical signs of HL, other looked clinically healthy. In fish of both groups similar dystrophic damages in liver and musculature were observed. The level of malondialdehyde (MDA) was high in both groups. Fish with signs of HL had higher level of MDA than trout looked healthy.
Experimentally two kinds of granulated diets (one standard with low and one with high oxidation of lipids) have been used to provoke HL in rainbow trout (Oncorhynchus mykiss, Walbaum). It was found out that the development of dystrophic processes led to increase malondialdehyde (MDA) concentration in affected tissues.
It was suggested that MDA levels could be used as a reliable indicator of peroxidative injury to biological systems, respectively to the quality of rainbow trout flesh. The quality of trout flesh was discussed.

Key words: malondialdehyde, trout flesh, rainbow trout, oxidized lipids, hepatic lipoidosis