| Autor: |
Nowosad J; Department of Research and Development, Chemprof, 11-041 Olsztyn, Poland.; The Stanislaw Sakowicz Inland Fisheries Institute, 10-719 Olsztyn, Poland., Jasiński S; Department of Ichthyology and Aquaculture, Warmia and Mazury University in Olsztyn, 10-701 Olsztyn, Poland., Arciuch-Rutkowska M; Department of Research and Development, Chemprof, 11-041 Olsztyn, Poland.; Department of Ichthyology and Aquaculture, Warmia and Mazury University in Olsztyn, 10-701 Olsztyn, Poland., Abdel-Latif HMR; Department of Poultry and Fish Diseases, Faculty of Veterinary Medicine, Alexandria University, Alexandria 22758, Egypt., Wróbel M; Department of Research and Development, Chemprof, 11-041 Olsztyn, Poland.; Department of Veterinary Prevention and Feed Hygiene, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland., Mikiewicz M; Department of Pathological Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland., Zielonka Ł; Department of Veterinary Prevention and Feed Hygiene, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland., Kotsyumbas IY; State Scientific-Research Control Institute of Veterinary Preparations and Feed Additives, 79000 Lviv, Ukraine., Muzyka VP; State Scientific-Research Control Institute of Veterinary Preparations and Feed Additives, 79000 Lviv, Ukraine., Brezvyn OM; State Scientific-Research Control Institute of Veterinary Preparations and Feed Additives, 79000 Lviv, Ukraine., Dietrich G; The Stanislaw Sakowicz Inland Fisheries Institute, 10-719 Olsztyn, Poland., Kucharczyk D; Department of Research and Development, Chemprof, 11-041 Olsztyn, Poland.; Department of Ichthyology and Aquaculture, Warmia and Mazury University in Olsztyn, 10-701 Olsztyn, Poland. |
| Abstrakt: |
This study aimed to determine the dietary effects of honeybee pollen (BP) on growth parameters, intestinal microbiota, hepatic histoarchitecture, and intestinal histomorphometry of African catfish Clarias gariepinus juveniles. The feeding experiment was carried out in a recirculating aquaculture system under controlled conditions for 21 days to achieve more than a 10-fold increase in weight in fish from the control group. Fish were fed well-balanced commercial feed without any supplements and served as a reference group (group C) and other diets enriched with varying BP levels as 1% (BP1), 2% (BP2), and 3% (BP3). Results showed a significant (p < 0.05) effect of the dietary BP not only on the growth parameters (such as final body weight: 5.0 g to 6.6−7.5 g, weight gain: 0.23 g/d to 0.31−0.35 g/d, body length: 84.7 mm to 93.8−95.9 mm, and specific growth rate: 11.7%/d to 13.1−13.7%/d, group C vs. experimental groups, respectively) but also on the development of beneficially important gut microbiota, such as lactic acid-producing bacteria. In BP-enriched groups, an average of 45% higher body weight gain was observed compared to those reared in the control group. The histological analysis showed that dietary BP may have a positive effect on the development of the intestinal tract and may enhance the absorption of nutrients with the potential ability to maintain a normal hepatic histoarchitecture of the treated African catfish. The results obtained suggest the optimum level of BP additive to feed for African catfish should be 1%. |
