Material and methodsMorphological and behavioural alterations occurred in the fish ilapia mossambica, following methallibure treatment. A complete loss of sexual dimorphism, absence of reproductive and agonistic behaviours and a total blanching of the body due to destruction of the melanophores were the changes recorded. Moreover, significant changes were also induced in the pars intermedia by this drug. These results are discussed in the light of available data.
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