Abstract
Summary and ConclusionsWhile the results are not complete enough to reach definite conclusions, it would seem that in view of similar and better known conditions in rodents the mechanism of the production of the “wedding dress” in Chrosomus erythrogaster is due to the action of substances having either a stimulating effect upon the sex glands of the fish, such as prolan, or having an effect similar to that of the estrus producing hormones, such as Yohimbine.Recent reports1,2,3 have made it probable that certain species of fish may be used successfully as test animals for the demonstration of either the gonadotropic or the sex hormones. For some time it has been known that certain male fish, such as Rhodeus amarus, Gastrosteus, Phoxinus laevis, belonging to the Cyprinidae group, assume striking color changes during the spawning period, lasting for several weeks in the spring. This so-called “wedding dress” or “mating coat” is due to the expansion of the chromatophoric cells of the skin and is considered to...
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