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Evaluation of dissolved organic carbon, bacterial load, and water quality parameters in culture reservoirs of warm water fishes
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Maryam Hasjemi Mojaver1   , Mohammad Kazem Khalesi * , Sohrab Kohestan Eskandari1 |
1- Department of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran.
Department of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran., Department of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran. , khalesi46@gmail.com |
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Abstract: (422 Views) |
In this study, dissolved organic carbon (DOC), bacterial load, and water quality parameters of three culture reservoirs of warm water fishes, each with areas of 12, 7, and 20 hectares, were investigated in two villages of Kiakola City in Mazandaran province. Water samples were collected from the inlet surface and floor, middle surface and floor, and outlet surface and floor every 2 weeks. Changes in the water quality parameters of reservoirs such as temperature, oxygen, pH, DOC, nitrate, ammonia, phosphate, barobacteria and chlorophyll a, and the correlation of all parameters were evaluated during the culture period in the natural culture environment. The process of changing parameters in each reservoir was variable due to separate fertilization and feeding management plans. The lowest and highest average temperatures in three reserviors were measured in April and July. Optimal alkaline pH (7-9) was recorded during the culture period. The highest average values of DOC (15.29±0.9, 14.64±2.6, and 18.70±1.6 mg/l) were observed in September and October in three reserviors. The lowest average DOC values (3.96 ± 0.01, 4.23 ± 0, and 4.56 ± 0.75 mg/l, respectively) were determined in April and May. The highest average values of bacterial load (37430±12.5, 136367±96.1, and 82800±73.5 cfu/g) were estimated in September and October and the lowest average values of bacterial load (111±61.2, 223 ± 21.2, and 134 ± 16.2 cfu/g) in April in all three reservoires. DOC and ammonia had a downward trend in reservoire 1 with no significant relationship (p>0.05), an upward significant relationship in reservoire 2 (p<0.05), and no upward relationship significant (p>0.05) in reservoire 3. There was an upward and significant relationship between bacterial load and DOC in all three reservoires (p<0.05). DOC and nitrogen content measurement of water allows to monitor and balance the carbon to nitrogen ratio (C/N) in water (1.15-1.20) to establish a good water quality in reservoires. The physical, chemical, and biological parameters in fish culture ponds should be monitored continuously for possible fluctuations to produce maximum and healthier products. Evaluation of the correlation between water quality, DOC, and microbial population can be used for the optimal performance of farmed fish.
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| Keywords: Organic Carbon, DOC, Bacterial Load, Ammonia, Warm Water Fishes. |
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Full-Text [PDF 463 kb]
(110 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/07/3 | Accepted: 2024/04/23 | Published: 2024/11/21
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