Toxicity of Zinc at sublethal exposure to rainbow trout (Oncorhynchus mykiss)
DOI:
https://doi.org/10.21615/cesmvz.15.1.1Keywords:
Rainbow trout, heavy metals, Zinc, growthAbstract
Zinc (Zn), can alter different physiological processes in fish such as growth and serum parameters. The objective of this study was to investigate the toxicity of Zn on sublethal exposure to rainbow trout (Oncorhnychus mykiss). Fish exposed to higher levels of Zn grew slower than fish exposed to lower levels of Zn. Weight gain and SGR (Specific Growth Rate) decreased linearly as the Zn level in the water increased. The CF (Condition factor) of fish grown in water with a high concentration of Zn also decreased significantly compared to the low concentration of Zn, whereas the Food Conversion Ratio (FCR) increased with the concentration of Zn in water. Both AST (Aspartate Transaminase) and ALT (Alanine Transaminase) activities were significantly altered by Zn and showed a linear pattern and decreased after 30 days, while ALP (Alkaline Phosphatase) levels showed a remarkable increase from a mean level of control. This study suggests that biochemical parameters of growth and serum could be used as important and sensitive biomarkers to monitor heavy metal toxicity on fish health status.
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