. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 186 CALIFORNIA FISH AND GAME in July when the testes were heaviest (Figure 5). Testes develop in a similar manner in pile perch (Wares 1968) and in redtail surf perch (Bennett and "Wydoski Ms.). Sperm was readily emitted between Oc- tober and January by pile perch and in early January by redtail surf- perch. SAMPLE 22. i i I i i i I i i 1 1 1 1 1 i i I'll 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 APR MAY JUNE
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 186 CALIFORNIA FISH AND GAME in July when the testes were heaviest (Figure 5). Testes develop in a similar manner in pile perch (Wares 1968) and in redtail surf perch (Bennett and "Wydoski Ms.). Sperm was readily emitted between Oc- tober and January by pile perch and in early January by redtail surf- perch. SAMPLE 22. i i I i i i I i i 1 1 1 1 1 i i I'll 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 APR MAY JUNE JULY AUG SEPT OCT DAT E FIGURE 5. The annual reproductive cycle of male silver surfperch from the Oregon coast dur- ing 1968. (Maturity index = gonad weight X 100 divided by body weight. The line was fitted by eye. The arrow indicates when milt was readily emitted.) Mating by silver surfperch occurred in fall (late September) and birth of the young occurred from late June to early August of the following year, approximately 9 months later. Few fish were captured from October to January, so the development of the embryos could not be followed during that period. The embryos grew from about 6 mm sl in January to 40 mm sl or more by June or July (Table 3). Fecundity Information on the fecundity of silver surfperch has been sum- marized (Table 3). Although the embryos were near term and some may have been lost during the capture of the fish, our experience with surfperch revealed that the female did not void embryos readily unless stressed by either low dissolved oxygen, increased temperatures, or both. Probably less stress would cause the embryos to be voided by the female as she became closer to term. During this study we kept each female in a separate plastic bag when the fish could not be transferred. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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