Changes in plasma thyroid hormones and cortisol levels in crucian carp (Carassius auratus) exposed to the extracted microcystins

This study demonstrates that administration of microcystins-containing extract causes a stress response and reduces the plasma levels of thyroid hormones in crucian carp

Dapeng Li; Ping Xie; Xuezhen Zhang

2008

Scholarcy highlights

  • The endocrine response of crucian carp injected intraperitoneally with extracted microcystins was investigated in this study
  • Plasma cortisol concentrations of fish in both dose groups significantly increased after administration of extracted MC and remained high throughout the experiment, which suggested that MC elicited a stress response in treated fish
  • Mortality occurred after 12 h in the high dose group
  • Fish exposed to MC-containing extract showed significant declines in T3, FT4, and FT3 levels in a dose-dependent manner throughout the experiment
  • This study demonstrates that administration of microcystins-containing extract causes a stress response and reduces the plasma levels of thyroid hormones in crucian carp
  • These results illustrate that microcystins exerted potent effects on the endocrine system of crucian carp, through activating their hypothalamus-pituitary- interrenal axis and disturbing thyroid function

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