Changes in free thyroid hormones levels in blood of Channa punctatus exposed to sublethal concentration (30%) of Lithium in different exposure days. Values are expressed as mean ± SD for above observation. – or + indicate percent decrease or increase over control. For two-way ANOVA P-values mentioned as: P>0.05 NS; FT4- P> 0.05 NS; TSH- P> 0.05 NS.