Effect of isoquinoline alkaloids on trout performance antioxidant status and filet fatty acid profile

Main targets in the aquaculture industry are to maintain fish health and to improve performance. We studied the effect of plant-based isoquinoline alkaloids (IQs) on growth performance parameters, hematological parameters, oxidative status and filet traits of rainbow trout (Oncorhynchus mykiss) under conventional farming. The experiments were carried out at the fish trout farm of Ministry of Agriculture in Louros River, Epirus. A total of 300 sub-adult trouts (63.6 g ± 5.1), were randomly allocated into 3 different treatments with four replicates. The control group (T1) was fed a basal diet, while the other two groups were fed diets supplemented with IQs (Sangrovit^®) 500 (T2) and 1000 (T3) g/t of feed, respectively. Results related to body weight, feed intake, feed efficiency and mortality show that the T3 group exhibited substantial increased body weight and SGR compared with the other two groups. IT can be deduced that IQs beneficially affected fish growth rate. Results for fatty acid profiles for the experimental groups record an increased amount of healthy UFA in groups T2 and T3 compared with T1. In terms of feed oxidative status T1 displayed significantly higher TBARS values compared to the IQ groups, which also exhibited higher levels of glutathione peroxidase (GSH-PX) activity in serum. This result indicates that plant-based IQs beneficially altered the filet oxidative status, in agreement with the levels of GSH-PX in the examined serum samples. Plant-based isoquinoline alkaloids (IQs) can be regarded as efficient natural growth promoters in trout.

All authors declare no conflict of interest.

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Artikel online veröffentlicht:
12. Dezember 2022