. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LAKE TAHOE TROUT PLANTING /i) 10 20 '0 20 10 20 JANUARY FEBRUARY MARCH 50,000 45,000 40,000. 5,000 I 15 I 25 5 I 15 ' 25 5 I 15 ( 25 5 f 15 i 25 " i 1 15 25 ' 10 20 10 20 10 20 10 20 10 20 AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER FIGURE 1—Contribution of planted trout to the Lake Tahoe sport fishery (excluding deepline effort), based on combined 1961, 1962, and 1963 boat census data. Number of trout planted during this period i
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LAKE TAHOE TROUT PLANTING /i) 10 20 '0 20 10 20 JANUARY FEBRUARY MARCH 50,000 45,000 40,000. 5,000 I 15 I 25 5 I 15 ' 25 5 I 15 ( 25 5 f 15 i 25 " i 1 15 25 ' 10 20 10 20 10 20 10 20 10 20 AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER FIGURE 1—Contribution of planted trout to the Lake Tahoe sport fishery (excluding deepline effort), based on combined 1961, 1962, and 1963 boat census data. Number of trout planted during this period includes only those plants whose estimated per- centages harvested were greater than three. When release of a given lot of trout required more than one day, the total number is shown on the first day of release only. months, the contribution of planted trout to the total catch per hour ranged from about 35 to 80%. Percentages were highest in July, Au- gust, and October. Beginning in December or January, their contribu- tion started to decline, reaching a low of about 8% in April and May. In general, this pattern can be attributed to a put-and-take fishery created by spring and summer releases of domestic rainbow trout. Total Harvest Estimates for Individual Plants Estimates of the total harvest of individual lots of stocked trout are derived from data gathered during the coordinated boat and Cave Rock censuses which took place from September 1960 through Decem- ber 1963. Estimates were calculated only for those releases made from August 28, 1960, through August 1963. Weidlein et al. (1965) and Cordone and Frantz (1966) describe the methods used to obtain estimates of total angler hours at Lake Tahoe. The figures obtained are point estimates for which no confidence limits could be calculated. Possible biases were examined and, although none was found which precluded the use of the method, they resulted in underestimates of total use and catch. In our judgment, this was not ser
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