Fig. 5. Changes in the biochemical composition of the gonad of P. depressus during gametogenesis. To standardize the change in the gonadal size, the level of each component shown in Fig. 4 was multiplied by the average gonad index at each stage shown in Fig. 3. Thus the values represent the amount of each component of the gonad in animals at a body mass of 100 g. (A) Ovary, (B) testis. Protein includes major yolk protein (MYP), denoted by diagonal stripes, and other proteins.