Document Type: Research Paper
Aksaray university, faculty of veterinary medicine
In this study, rainbow trout were fed for a total of 144 days with different feed mixes containing 0.00%, 0.10%, 0.40%, 0.70%, 1.00% and 1.30% black cumin oil. The effect of black cumin oil on the growth performance, feed content and fatty acid composition of rainbow trout was researched. The starting weight of fish in the experimental group was approximately 60 gr., which increased respectively to 215.21±4.12gr, 217.32±3.14gr, 235.12±2.9gr, 240.21±6.5gr, 260.14±4.7gr, and 258.89±1.6gr, while the difference in growth between the groups was observed to be statistically significant (p<0.05). Black cumin oil decreased the feed conversion rate of the fish. The addition of black cumin oil into the fish feed increased feed consumption and the daily feed consumed per fish was as follows, respective to each group; 0.93gr, 0.93gr, 0.97gr, 1.00gr, 1.02gr and 1.02gr. At the end of the experiment the economic conversion rates of the fish ($/Kg) were between 1.58 and 1.67, while the economic benefit index was between 0.60 and 0.72. The study showed that the protein efficiency rate and specific growth rates of the experimental group had been increased. The addition of black cumin oil to the feed increased the proportions of raw protein, oil and raw cinder in the trout and decreased the proportion of moisture, while also increasing the amounts of linoleic, oleic and stearic acids.
In conclusion, the addition of 1.00% black cumin oil into the feed increases the fishes' growth performance and decreases costs.