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Graded levels of manganese were supplemented to a semi-purified diet containing 45% crude protein, to provide six levels of manganese (i. e. containing 5, 25, 50, 70, 140 and 210×10−6, respectively) for two experiments with these experimental diets. The initial weight of shrimp used in the 35–day experiment I was 0.30±0.04 g, and that in the 70–day Experiment II was more than one gram. The results...