Interactive effects of combined cropping of rice and shrimp (Macrobrachium nipponense)

The cultivation of rice and shrimp globally has expanded significantly due to its economic efficiency. The purpose of this study was to investigate the effect of shrimp and rice combined cultivation on shrimp quality after salting and during its storage and rice crop. Therefore, shrimp biochemical compounds after salting were analyzed every two weeks, from week 0 to12. In addition, shrimp growth indices were calculated during raring period every two weeks (for 12 weeks) and rice morphological and performance indices were evaluated at the end of 12th week. The results of the evaluation showed that in general, all of the evaluated indices of the shrimps such as specific growth rate, conversion factor efficiency and survival percentage and also the chemical composition of shrimp bodies such as protein, crude fat and moisture content in shrimps obtained from combined cultivation with rice were favorable. In addition, rice and shrimp cultivation had significant effects on all morphological traits and rice yield, such as total leaf chlorophyll content, plant height, tiller number, tillers in each cluster, flag leaf length and width, spike length, grain yield, number of grains per spike, 1000 grain weight, number of filled grains per cluster and the amount of biomass of rice plants grown under combined treatment of rice and shrimp compared to chemical fertilizer treatment.