Figure 1.

Changes in California sheephead size structure and fishing pressure at San Nicolas and Catalina Islands. Top panels show shifts in size frequency distributions (SL, mm) of immature, female and male individuals at (a) San Nicolas and (b) Catalina from 1970 or 1980, 1998 and 2007. Arrows depict the size at maturation (50% probability that fish are mature female; grey arrows) and size at sex change (50% probability that fish are male; black arrows) calculated based on logistic regression. No data on immature size frequencies were available from San Nicolas in 1980. Bottom panels show (c) commercial and (d) recreational landings of California sheephead from 1993 to 2007 from fishing blocks around San Nicolas and Catalina, respectively. Note that commercial take is reported in pounds landed, whereas recreational take is reported as the number of fish landed on commercial passenger fishing vessels.