Effects of organic carbon addition on water quality and growth performance of bottom- and filter-feeding carp in a minimum-water-exchange pond polyculture system
Zhao, Zhigang | Luo, Liang | Wang, Chang’an | Li, Jinnan | Wang, Liansheng | Du, Xue | Xu, Qiyou
A 120-day evaluation was performed to determine the impacts of various carbon source supplements on the water grade and production of bottom- and filter-feeding carp inside a minimum-water-exchange system. The outcomes revealed that the overall ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, total inorganic nitrogen, and orthophosphate concentrations in every one of the carbon source treatments were significantly less (P < 0.05) than the control. The net production of silver carp and bighead carp in the molasses treatment was significantly higher (P < 0.05) than that in the control. The total feed conversion rates of the fish in the molasses and the mixed carbon source treatments were significantly lower (P < 0.05) than in the control, while the total protein efficiency ratio values in the corn starch, molasses, and mixed carbon source treatments were significantly higher (P < 0.05) than those in the control. The bioflocs significantly (P < 0.05) impacted the muscle makeup of crude protein, crude fat, and ash of mirror carp. The current examination showed that the increased generation and feed used in mirror, silver, and bighead carp may be reached with an enhanced water grade when different carbon sources were added, while the use of molasses, an organic carbon source, was optimal compared to the other carbon sources due to its low price and good effect.
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