Upon a technical and

historical archive and the experience of a student.s long term

visit in the Centro Truchícola de Ojo de Agua de Dota

belonging to the Instituto Costarricense de Pesca y

Acuicultura (INCOPESCA), general aspects, environmental

conditions, management and reproductive behavior of the

iridescent rainbows trout, are described for Costa Rica, as

well as the advance of the male induction and triploid female

production program. Based on the diagnosis, the

effectiveness of the migratory instinct of the fish in semi

natural conditions, was evaluated considering egg and semen

quality, allowing a selection of 66 % of females and 83 % of

males as reproductive stock. Young, one kilogram females

lay between 1000 and 1500 eggs, two year olds weighting 1.5

kg between 1645 and 2500 and the three year old and 2 kg in

weight, approximately 3500. Egg weights fluctuate from 0.05

to 0.112 g and incubators survival rate range from 57 to