. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SPOT PRAWN GROWTH AND REPRODUCTION 87 and the October-November period (Figure 2). During the October-November period, however, recruitment of prawns from the 1980 year class (age group 2) began. These animals averaged 30 mm cl. Their presence continued through the winter, appearing in large numbers during the January-March quarter, and ave- raging 34 mm cl(Figure 2). Also during this period, prawns from the 1981 year class in the 21-1
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. SPOT PRAWN GROWTH AND REPRODUCTION 87 and the October-November period (Figure 2). During the October-November period, however, recruitment of prawns from the 1980 year class (age group 2) began. These animals averaged 30 mm cl. Their presence continued through the winter, appearing in large numbers during the January-March quarter, and ave- raging 34 mm cl(Figure 2). Also during this period, prawns from the 1981 year class in the 21-18 mm CL range began appearing (Figure 2). Von Bertalanffy Growth Calculation The monthly modes from April 1981 through March of 1982 were incorporat- ed in applying the Von Bertalanffy equation, using the computer program BVG2 (Abramson 1971). A curve was plotted with the following parameters: L oc = 96 mm CL, K = and to = — The curve fitted well with the observed length at early ages, although L oc occurred much beyond the observed range (Figure 3). Maximum observed age is estimated at 6+years. This is at least a year older than the previously reported maximum age of 5 years (Butler 1964). 70 60 Butler(1964) VBG curve calculated from observed lengths Observed lengths. AQE FIGURE 3. Observed and VBG-calculated length at age of spot 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 not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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