| The use of hormonal factors in the induction of artificial egg laying was introduced in fish farming following the first works by Houssay in 1929. Since then, this technique has not evolved much. Pickford and Atz in 1957 have reviewed, exhaustively, most of the attempts carried out to date. This approach is still widely used, and in this way numerous hormonal concoctions have been put into use: mammalian hormones LH, FSH, HCG, PMS... and some fish hypophyseal extracts (mostly carp) often in a raw state. The hypophysation technique can be considered as finalized in the carp, through the use of homologous concoctions. However, in other species, success is more unpredictable and variable, depending on the nature of the hormones used. |
