The effect of some detergents (anionic surfactants) in the rearing environment on the embryogenesis, eying percentage, embryonic abnormalities and cortisol levels in rainbow trout (Oncorhynchus mykiss)

Document Type : Research Paper

Authors

1 Ph.D student, Department of fisheries, Faculty of VNatural Resources, University of Tehran, Karaj,Iran

2 Professor, Department of fisheries, Faculty of VNatural Resources, University of Tehran, Karaj, Iran

3 Dept. of Fisheries, Faculty of Natural Resources, University of Tehran

4 M.Sc. Department of fisheries, Faculty of VNatural Resources, University of Tehran, Karaj, Iran

Abstract

Anionic detergents make up a large portion of domestic wastewater due to their high consumption. With the entry of wastewater into water sources, these substances enter the aquatic environment and cause serious damage to aquatic animals, including fish, by reducing dissolved oxygen in water and causing stress. The aim of this study was to obtain evidence to determine the effect of these substances on the embryonic growth of rainbow trout. For this purpose, rainbow trout eggs and embryos were exposed to doses of 1 mg / l of washing powder, 0.5 mg / l of dishwashing liquid, 0.25 mg of bleach in different stages from fertilization to hatching and sampling was done during this period. The treatments were tested for embryonic growth time, percentage of eyeing, percentage of mortality, appearance and cortisol levels of eggs and embryos. The results showed that detergents accelerate the stages of embryonic development, increase the mortality rate, reduce the percentage of eyeing, induce stress and increase cortisol and cause fetal abnormalities. In general, it can be concluded that the entry of domestic and industrial wastewater and subsequently entry of detergents into water sources can cause toxic effects and irreparable damage to aquatic species

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