Effects of chemical and microbial fertilizers on the biodiversity indices of phytoplankton and zooplankton orders and density of primary production of earthen ponds of common carp fry
Subject Areas : New Technologies in Aquaculture Development
Mehdi
Shamsaie Mehrgan
1
(Department of Fisheries, Science and Research Branch, IAU)
Keywords: Primary production, Microbial fertilizer, Keywords: Phosphate fertilizer, Phytoplankton population, Zooplankton population,
Abstract :
AbstractIn this study, the effect of chemical and microbial fertilizers on the density of primary products and biodiversity indices of phytoplankton and zooplankton biodiversity categories over a period of three months in a hydrothermal fish farm located in Abadan city were studied and compared. The experiment was completely randomized, consisting of two treatments, each with three replications, including the first treatment: water’s pond fertilized by chemical fertilizers and cow manure, and the second treatment: water’s pond fertilized by microbial fertilizers and cow manure. In this study, different types of phosphate fertilizers at the rate of 75 kg per hectare and microbial fertilizers including two nitrogen bacteria, Azotobacter chroococcum, and Bacillus coagulans were used. The results of this study showed that the mean of phytoplankton counted in the first treatment (chemical fertilizer) was significantly higher than their number in the second treatment (microbial fertilizer) (P<0.05). Among them, most of the counted phytoplankton belonged to the Bacillariophyceae class in chemical fertilizer treatment. However, the mean of zooplankton counted in the second treatment (microbial fertilizer) indicated a higher number of zooplankton compared to the first treatment (chemical fertilizer) (P<0.05). Among them, most of the counted zooplankton belonged to the Rotifer class in microbial treatment. In conclusion, due to the zooplankton being eaten by most carp juveniles in hydrothermal ponds in the first year of breeding and a significant increase in zooplankton population in microbial fertilizer treatment compared to chemical fertilizer, it can be concluded that microbial fertilizers have a positive effect on the number of zooplankton in hydrothermal pools.
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