Effect of organic fertilizers on the growth of common carp (Cyprinus carpio) farmed in rice fields

Abstract

The study was conducted to determine the effect of organic fertilizer (cow manure) on some growth characteristics of common carp (Cyprinus carpio) cultured in rice fields on an area of 400 m2, 20 m * 20 m. The land was divided into four rice fields. The area of each field was 100 square meters, with equal dimensions of 10 m * 10 m. Each field contained a trench 50 cm wide and 80 cm deep, which served as a refuge for fish. The Jasmine rice variety was planted on lines with dimensions of 30 cm. Fish with an initial weight of 100 g were cultured densely. 1 fish/m2 using four parameters:

T1 Adding organic fertilizer (cow waste) without providing fish feed, T2 Adding organic fertilizer while providing fish feed, T3 Not adding organic fertilizer while providing fish feed, T4 Not adding organic fertilizer and not providing fish feed, the fish were weighed every 14 days. The results of the statistical analysis showed that there were significant differences (p≤0.05) in terms of total weight gain and daily growth rate, as treatment T2 outperformed the rest of the treatments, followed by treatment T3, which outperformed treatments T2 and T1, respectively. As for the rate and efficiency of food conversion, the results of the analysis showed Statisticians did not record significant differences (p≤0.05) between treatments T2 and T3. In light of the above results, it can be concluded that it is possible to implement common carp farming in rice fields in Iraq using organic fertilization and supplementary feed, without adding pesticides or chemical fertilizers.