Effects of rainbow trout farming on water quality around the sea farms in the south of the Caspian Sea

Document Type : Research Paper

Authors

1 Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Research Organization (IFRO), Agriculture Research, Education and Extension Organization (AREEO), Sari, Mazandaran, Iran

2 Department of Fisheries, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran

Abstract

The purpose of this study was to investigate the physical and chemical factors of seawater to determine the water quality index around two marine farms of rainbow trout in the south of the Caspian Sea. Each farm had four floating polyethylene cages with a final fish harvest of 60 tons. The water sampling was performed in January and March 2014 as well as May and August 2015 from around the cages (close: cage shade, 50 m and 100 m; distant: 1000 m) in three geographical directions: east, west, and south. The water quality parameters including pH, temperature, transparency, salinity, electrical conductivity (EC), total dissolved solids, dissolved oxygen, and nutrients (nitrogen and phosphorus compounds) were determined. The results of the analysis of variance of data at both farms showed that changes in physical and chemical parameters of water had only significant differences at the time of sampling (p < 0.05). The highest value of variance in the principal component analysis (PCA; 30.23% from 84.75%) was related to EC, temperature, salinity, total nitrogen, pH, and organic phosphorus. Iran Surface Water Quality Index (IRWQISC) at near and far distances from farms was determined to be moderate (40-55). The main reasons for this result can be attributed to the small-scale and short fish farming period along with the hydrological conditions of the region.

Keywords

References

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Caspian Journal of Environmental Sciences
Volume 20, Issue 4
October 2022
Pages 729-737

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