[Hypophyseal injections for aquarium carp and artificial spawning as a method for breeding new races of carp]

A method of raising and multiplying carp is reported which makes a faster establishment of new breeds possible.Carp (Cyprinus carpio) raised in aquaria and fed on dry food reached maturity already after two years. Pituitary injections make it possible to obtain roe and milt from such fish.Fertilization, hatching, and raising of the young are also performed under laboratory conditions.There is no endogenous sexual rhythm in carp, for spawning can be accomplished at any time of the year, and several times annually using the same parents. The method of artificially obtaining and hatching spawn is described. It is suitable for breeding and physiological experiments.A comparative analysis of the physiological dynamics in eggs, young fish, and adults is considerably simplified for the physiologist interested in metabolism, and the breeder can reach his goals more rapidly because of the shortened generation time.