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The effectiveness of Micrococcus luteus bacteria on digestibility coefficient, growth indices, survival and bacterial load of water and digestive tracts of common carp (Cyprinus carpio) fry
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Mehran Avakh Keysami   , Alireza Akbari , Hamid Abdolahpour Biria , Maryam Avakh Keysami |
| Agricultural Research, Education and Extension Organization |
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Abstract: (15 Views) |
This research was conducted to investigate the effect of Micrococcus luteus bacteria on the growth efficiency, digestibility, and bacterial load of the digestive tract of common carp fry (Cyprinus carpio) in Mirzakochek Khan Fisheries Science and Industry Training Center and Shahid Ansari Bony Fish Reserve Reproduction and Regeneration Center in Gilan was carried out during May to August 2023. In this experiment, Micrococcus luteus isolated from the digestive tract of common carp was fed to commercial pellet food of 300 pieces of common carp juveniles (28.018 ± 2.87) for 8 weeks in a completely randomized design with 5 treatments and 3 replications (20 pieces of fish in each tank) used. Mixing fish feed in the suspension of M. luteus, 5 types of diets with different concentrations of Micrococcus in the pellet including 104, 105, 106, 107 cfu were prepared as treatments 1, 2, 3, 4 and control without bacteria.. After 56 days of feeding with these treatments, different levels of Micrococcus luteus bacteria in the diet of common carp fry increase the amount of The values of weight gain (BWI./.), specific growth index (SGR), protein digestibility and fat digestibility compared to the control group(P<0.05). The food conversion ratio (FCR) was substantially different from the control treatment in treatments 1, 2, and 3 (P<0.05) and there was no significant difference between the treatment 4 and the control treatment (P>0.05). Based on the obtained results, the best performance of growth indicators was observed in treatments fed with a level of 106 bacteria of Micrococcus luteus in the diet, and the increase of bacteria of Micrococcus luteus in the diet was more than 106 did not show any statistics differences (P>0.05).There was a significant difference between the number of gram-positive and gram-negative bacteria in the digestive tract and water of the rearing tanks compared to the control treatment (P<0.05). Analysis of the results showed the benefits of using M. luteus probiotic in the diet of common carp fry in some cases. M. luteus is usually not pathogenic for fish. Therefore, the use of this probiotic in common carp farming to increase the production is recommended.
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| Keywords: common carp, Micrococcus luteus, growth indices, digestibility, bacterial load |
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Full-Text [PDF 773 kb]
(15 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2025/05/1 | Accepted: 2025/06/21 | Published: 2025/06/21
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