Seasonal Growth Dynamics of Common Carp (Cyprinus Carpio) Under Varying Stocking Densities and Hydrochemical Conditions

U.M. Asomiddinov; Kh.B. Yunusov; F.E. Kurbanov; S.S. Jaxongirov; S. Usmonova

Authors

U.M. Asomiddinov Independent Researcher, Assistant in Samarkand State University of Veterinary Medicine, Animal Husbandry and Biotechnologies
Kh.B. Yunusov Scientific Advisor, Doctor of Biological Sciences, Professor Samarkand State University of Veterinary Medicine
F.E. Kurbanov Doctor of Veterinary Sciences, Associate Professor Samarkand State University of Veterinary Medicine, Animal Husbandry and Biotechnologies
S.S. Jaxongirov PhD Student in Samarkand State University of Veterinary Medicine, Animal Husbandry and Biotechnologies
S. Usmonova Samarkand State University of Veterinary Medicine, Animal Husbandry and Biotechnologies.

Keywords:

Common carp ( Cyprinus carpio ), growth dynamics, seasonal, stocking density, water quality, dissolved oxygen, free ammonia, water hardness, hydrochemical regime, intensive aquaculture

Abstract

This study evaluates the impact of seasonal fluctuations and hydrochemical water parameters on the body weight gain of common carp (Cyprinus carpio) in intensive aquaculture. The study was conducted on 1-hectare ponds that had two different stocking levels (5,000 and 7,000 fish/ha). The results show that the growth rates considerably slowed down after mid-summer, and weight gain slowed down to 63.7% in May to 8.6-12.0 in September, which was mainly due to thermal stress and hypoxia. The research scientifically establishes the optimal levels of thresholds to maximize productivity: ammonia ( NH3 ) and dissolved oxygen @ above 5.0 mg/L and water temperatures between 18.6-22.0 C. Moreover, it examines the use of water hardness as a buffering agent against ammonia toxicity.

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