Effect of methallibure on gonadotrophic content, ovarian 32P uptake and gonadosomatic index in the freshwater catfish, Heteropneustes fossilis (Bloch)

Thyroid activity in response to some gonadal steroids in methallibure-treated Heteropneustes fossilis (Bloch)

Methallibure treatment is as effective as hypophysectomy in reducing thyroid activity in H. fossilis. Sex steroids (TP and EB) administration restored thyroid activity in methallibure-treated females to normal level, but failed to elicit any response in males. This drug seems to block TSH secretion and thyroid hormone synthesis in H. fossilis.

The effect of gonadotrophins on the steroidogenesis, in the ovary and testis of gonadotrophin-deprived fresh water teleost, Cyprinus carpio

Studies have been made on the effect of LH, FSH, and LH+FSH on the gonadal steroidogenesis in gonadotrophin-deprived common carp. LH alone and in combination with FSH was more effective than FSH in stimulation of steroidogenesis.

The effect of methallibure (I.C.I. 33,828) on the steriodogenesis in the ovary and testis of a fresh water teleost, Cyprinus carpio

Methallibure treatment of mature Cyprinus carpio causes a marked reduction in the steroidogenesis, as indicated by the fall in 3beta-HSD activity in the gonads. Significance of these results is discussed.