Toxicity of Zinc at sublethal exposure to rainbow trout (Oncorhynchus mykiss)

Autores/as

  • Fereshteh Nasri Shahrekord University
  • M. Saeed Heydarnejad Shahrekord University
  • Amin Nematollahi Shahrekord University

Resumen

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. 

 

Toxicidad de zinc por exposición subletal en trucha arco iris (Oncorhynchus mykiss)

TZinc (Zn), puede alterar diferentes procesos fisiológicos en peces, tales como, el crecimiento y los parámetros séricos. El objetivo de este estudio fue investigar la toxicidad de Zn en la exposición subletal de la trucha arco iris (Oncorhnychus mykiss). Los peces expuestos a niveles más altos de Zn crecieron más lentamente que los peces expuestos a niveles más bajos de Zn. El aumento de peso y la SGR (tasa de crecimiento específica) disminuyeron linealmente a medida que aumentó el nivel de Zn en el agua. El CF (factor de condición) de los peces cultivados en agua con una alta concentración de Zn, también disminuyó significativamente en comparación con la baja concentración de Zn, mientras que el índice de conversión de alimentos (FCR) aumentó con la concentración de Zn en el agua. Las actividades AST (Aspartate Transaminase) y ALT (Alanine Transaminase) fueron significativamente alteradas por el Zn y mostraron un patrón lineal y disminuyeron después de 30 días, mientras que los niveles de ALP (Fosfatasa Alcalina) mostraron un aumento notable desde un nivel medio de control. Este estudio sugiere que los parámetros bioquímicos de crecimiento y suero podrían usarse como biomarcadores importantes y sensibles para controlar la toxicidad de metales pesados en el estado de salud de los peces. 

Palabras clave: Trucha arcoiris, metales pesados, Zinc, crecimiento.

 

Toxicidade por exposição ao zinco em trutas arco-íris (Oncorhynchus mykiss)

O TZinc (Zn) pode alterar diferentes processos fisiológicos em peixes, como parâmetros de crescimento e soro. O objetivo deste estudo foi investigar a toxicidade do Zn na exposição subletal à truta arco-íris (Oncorhnychus mykiss). Os peixes expostos a níveis mais altos de Zn cresceram mais lentamente do que os peixes expostos a níveis mais baixos de Zn. O ganho de peso e a SGR (Taxa de Crescimento Específico) diminuíram linearmente à medida que o nível de Zn na água aumentou. O CF (fator de condição) de peixes cultivados em água com alta concentração de Zn também diminuiu significativamente em comparação com a baixa concentração de Zn, enquanto a tax on de conversão alimentar (FCR) aumentou com a concentração de Zn na água. As atividades de AST (Aspartate Transaminase) e ALT (Alanine Transaminase) foram significativamente alteradas pelo Zn e mostraram um padrão linear e diminuíram após 30 dias, enquanto os níveis de ALP (Fosfatase Alcalina) mostraram um aumento notável em relação ao nível médio de controle. Este estudo sugere que parâmetros bioquímicos de crescimento e soro podem ser usados como biomarcadores importantes e sensíveis para monitorar a toxicidade de metais pesados no estado de saúde dos peixes.

Palavras-chave: Truta arco-íris, metais pesados, Zinco, crescimento.

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2020-05-01

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