. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. lie CALIFORNIA PISH AND GAME other factors, possibly the vernal increase in food supply, as revealed by the larger volume of food found in the stomachs in spring and sum- mer compared \\ ith fall and winter Table 3). I 15 z IK) Q O § 105 u u. o i_ z UJ o UJ o o 0 95 -. - L _ _ SEP J_ OCT NOV 1963 DEC .-'. FEB MAR APR MAY 1964 JUNE JULY AUG SEP FIGURE 5—Seasonal variation in coefficient of condition of male and fema
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. lie CALIFORNIA PISH AND GAME other factors, possibly the vernal increase in food supply, as revealed by the larger volume of food found in the stomachs in spring and sum- mer compared \\ ith fall and winter Table 3). I 15 z IK) Q O § 105 u u. o i_ z UJ o UJ o o 0 95 -. - L _ _ SEP J_ OCT NOV 1963 DEC .-'. FEB MAR APR MAY 1964 JUNE JULY AUG SEP FIGURE 5—Seasonal variation in coefficient of condition of male and female Lake Tahoe Piute sculpins. Reproduction The time of spawning of the Piute sculpin was determined from monthly changes in mean egg diameters and computation of the gonadal-body weight ratio, or gonosomatic index. A random sample of 20 eggs was taken from the ovaries of each of 136 fish. Diameters were measured to mm. Fecundity was measured by direct count of the total number of eggs from both ovaries. Low monthly mean gonosomatic indexes for females occurred follow- ing spawning and in the fall and winter months (Figure 6). Peak monthly indexes of over 13% for females occurred in April. May. and June. The peak value for males was only and it occurred in April. The index for females dropped sharply between June and August, coinciding with a sharp decline in the condition factor during the same interval (Figure 5). Changes in males were of a lower magni- tude and preceded similar changes in females by nearly 2 months. Fluctuations in the gonosomatic ratios for males did not correspond with seasonal variations in condition factors. Gonadal development in males apparently exerts little influence on their condition. Mean diameters of sculpin eggs increased from a low of mm in September, corresponding to the lowest monthly gonosomatic index, to a high of mm in May and then dropped to mm in June. No samples were available for July, but the mean diam
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