Effects of prolactin and bromocriptine in Discoglossus pictus (anuran amphibian. Otth) tadpoles.

1. The results obtained by ovine prolactin administration during the larval development of Discoglossus pictus (OTT) suggests that prolactin-like hormone is the "larval factor" necessary for growth and for maintaining the larval aquatic features. 2. Bromocriptine treatment during the larval development of D. pictus has contrary effect on growth and larval structures. 3. Prolactin administration does not inhibit but delays metamorphosis. 4. When bromocriptine is added at late stages of the development, metamorphosis is accelerated.