Fingerlings of Channa punctatus are exposed to 12 mg/l zinc sulphate for 31 d at daily feeding. From the 19th day a significant decrease of growth (increase of weight) by 7 … 8 % as compared with the untreated control fishes was found. After exposure for 30 d the RNA‐ and protein‐contents of the muscles are lower by 10 and 13 %, respectively.
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Shukla et al. (1986) studied this question.
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