. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 72 CALIFORNIA FISH AND GAME 30-. Observed Boss Spawning Mar ' Apr ' May ' Jun ' Jul FIGURE 3. Millerton Lake surface temperature trends, 1973. Aug Sep Water Level Fluctuation Between 1 and 31 March the reservoir level fluctuated moderately, rising 4 m. During April, it receded at a mean rate of m per day, resulting in a total drawdown of m. From 1 May to 15 May, the lake level dropped at a mean rate of m per day. Then, w
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 72 CALIFORNIA FISH AND GAME 30-. Observed Boss Spawning Mar ' Apr ' May ' Jun ' Jul FIGURE 3. Millerton Lake surface temperature trends, 1973. Aug Sep Water Level Fluctuation Between 1 and 31 March the reservoir level fluctuated moderately, rising 4 m. During April, it receded at a mean rate of m per day, resulting in a total drawdown of m. From 1 May to 15 May, the lake level dropped at a mean rate of m per day. Then, with heavy inflow from snow runoff, it increased rapidly. From 16 May to 8 June, the mean daily increase in water level was m. The greatest rate of increase occurred on 18 and 19 May, when the water level rose m over a 48 h period. Millerton Lake attained its maximum capacity on 8 June and then spilled for 9 consecutive days, during which the surface elevation remained almost stable. Onset of Spawning Spawning was first observed on 16 March, when peak afternoon surface temperatures reached ^C. Twenty-one bass engaged in nest construction, spawning, or nest protection were observed during the following 9 d. Of the nesting attempts, only three progressed to the point of actual egg deposition. Of 24 adult female bass examined in late March, 22 had ovaries containing ova in widely varying stages of development. Only two individuals showed indications of recent spawning. Based on these observation, it was surmised that the onset of spawning came rather gradually and that peak spawning activity would probably not take place until at least several weeks later. By late March, low numbers of fry were observed in scattered schools along the shoreline. The index of fingerling abundance on 29 and 30 March was only fish per km of shoreline (unpublished data).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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