. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SPOTFIN SURFPERCH LIFE HISTORY INFORMATION ^01 spotfin surfperch are locally abundant during all seasons at survey depths of 15 to 35 m I Kukowski 1973; CM. Cailliet, Moss Landing Marine Laboratories, pers. commun.); however, catch-per-unit-effort appears to decline between 18 and 30 m. Future studies should document sex-specific differences in distribution and growth rates. Recent work (Dorn, Johnson, and Darby 1979) comparing the sw
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SPOTFIN SURFPERCH LIFE HISTORY INFORMATION ^01 spotfin surfperch are locally abundant during all seasons at survey depths of 15 to 35 m I Kukowski 1973; CM. Cailliet, Moss Landing Marine Laboratories, pers. commun.); however, catch-per-unit-effort appears to decline between 18 and 30 m. Future studies should document sex-specific differences in distribution and growth rates. Recent work (Dorn, Johnson, and Darby 1979) comparing the swimming abilities of pregnant and nonpregnant rainbow surfperch, Hypsurus caryi, indi- cates that near-term females are unable to achieve the sustained or burst swim- ming speeds typical of the species; therefore, they must be at a great disadvantage when trying to avoid predators. This is probably true for all near- term surfperches, and females of many species move inshore or take refuge in turbid bays, eelgrass beds, or other complex habitats where they and their young can better avoid predation. The young can grow more rapidly in a warm, productive habitat. This tendency helps to explain the skewed adult sex ratios seen in many inshore collections of embiotocids; however, the slower growth of male spotfin surfperch suggests that they, like some other male embiotocids, also suffer higher mortality than females (Warner and Harlan 1982). Thus the skewed adult sex ratios observed in spotfin surfperch collections are related to sex-specific differences in distribution and/or mortality. X UJ I- UJ ^ 5 o o o o: 0 *-V. 90 fOO 110 120 FEMALE STANDARD LENGTH FIGURE 2. The regressions of preserved brood wet weight (g) on female standard length (mm) in two samples of near-term embryos: open circles, solid line, San Simeon 1948 (y = + , r = , N = 29, P < ); open triangles, dashed line, San Simeon 1949 (y = + , R = , N = 10, P < ).. Please no
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