This study investigated the effects of dietary supplementation of combined black cumin (BC) and grape seed (GS) powder at different rates (0%, 1%, 2%, and 4%, respectively) on growth performance and hepatopancreas histology of third instar Turkish narrow-clawed crayfish (Pontastacus leptodactylus). A total of 180 third instar of crayfish with an initial mean weight of (0.06 g ±0.01 g) and mean length (11.0 mm ±0.01) were randomly assigned to four treatment groups with three replications in each group and at a density of 15 crayfish per replicate. Crayfish were fed an experimental diet rate of at 10% of total body weight for 84 days. Growth performance parameters were improved significantly with BC and GS powder supplementation (P<0.05), while survival rates did not differ among all groups (P>0.05). Weight gain, specific growth rate and feed conversion rate of the 1% group tended to be better than the other groups, with significant differences among groups (P<0.05). The number and volume of B cells increased significantly with the increase in the amount of (BC and GS) added to the feed (1, 2, and 4%) in the hepatopancreas. In addition, it was determined that the R cells, which absorb nutrients, are dense in the hepatopancreas tissue of the crayfish fed with 1% (BC and GS) added feed compared to the other groups. The results showed that dietary supplementation of 1% BC and GS could benefit third-instar crayfish's growth and histological data. Therefore, combining BS and GS can be recommended as a promising new feed additive for narrow-clawed crayfish culture.
Medical plants, Freshwater Cray-fish, Nigella sativa, Vitis vinifera, Growth, Survival
Primary Language | English |
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Subjects | Hydrobiology, Fish Pests and Diseases |
Journal Section | Research Articles |
Authors |
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Early Pub Date | June 19, 2023 |
Publication Date | July 17, 2023 |
Submission Date | April 11, 2023 |
Acceptance Date | May 21, 2023 |
Published in Issue | Year 2023Volume: 6 Issue: 3 |
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