Evaluating the Impact of Changes in Nutritional Ratios on Water Quality and Protein Digestibility Coefficient for Carp Fish

The experiment conducted at Anbar University's Fish Laboratory aimed to assess the impact of varying nutritional ratios on water quality and protein digestion coefficient in common carp fish. Over 30 days, 126 common carp were randomly allocated to 18 glass basins, each containing 7 fish. Six different feeding ratios were tested over two daily meals. Water temperature remained between 20°C and 25°C, dissolved oxygen concentration ranged from 8.5 to 10.1 mg/L, and pH was 7.1-7.5, suitable for carp breeding. Statistical analysis revealed that a 5% feeding ratio yielded the highest apparent digestion coefficient (89.14%) and protein digestion coefficient (88.50%). The first feeding ratio, at the saturation limit, significantly influenced waste appearance time compared to other ratios. The study concludes that altering feeding ratios significantly affects water quality and carp fish health, impacting growth rates.