Abstract
Hypophysectomy severely reduced linear growth in Salmo gairdneri. Intraperitoneal injections of porcine somatotropin stimulated linear growth proportionate to hormone dose. Doses of 3.4 and 6.8 mU/g body weight induced higher growth rates than those shown by a control group of intact animals at the same time. Hormone treatment did not affect the length-weight relationship or “condition factor”. Neither hypophysectomy nor hormone treatment influenced muscle moisture, hematocrits, or gonadosomatic indices. However, hypophysectomized animals had enlarged livers and showed an increase in hepatic glycogen which was returned to normal levels by somatotropin. Morphologically, hypophysectomized animals were characterized mainly by the absence of xanthic pigmentation. These findings are discussed in relation to other species, and hypophysectomy of salmonids is evaluated as a tool for the assay of somatotropins.
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