Summary. Maturity was studied on 273 rainbow trout of both sexes. The female gonads were classed into 3 maturation stages and the male gonads into 4. Characteristic pherograms of both serum protein electrophoresis and total serum protein corresponded with maturation stage. Electrophoretic globulin and total protein fractions increased considerably with spermatogenetically active testes and mature ovaries ; the A/G ration decreased accordingly. These parameters can be used to determine maturity.Introduction.
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