Information on spawning, feeding habits and on growth and condition of planted lake trout in Green Lake, Wisconsin, is presented. Failure of natural reproduction of the planted trout of Great Lakes stock in this lake is attributed to lack of cover for the eggs on the spawning bar and subsequent predation by Necturus. An artificial spawning bed of angular fragments of rock deposited on the spawning bar in 60 to 100 feet of water appears to be providing the necessary egg protection. In this oligotrophic lake of 7,325 acres Mysis is the main food of immature trout shorter than 14 inches and ciscoes the principal food of adult trout longer than 27 inches. Length-weight relationship is of the usual pattern and coefficient of condition for the younger fish about the same as that reported for Great Lakes trout but is higher for the larger adult fish. Average egg production of 18 females, at least 12 years old, was 5,417 eggs in the fall of 1956. It is suggested that selection of an unfavorable deep-water spawning area in preference to more suitable areas in shallower water is inherent in the race of trout stocked here.
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Vernon A. Hacker (1957) studied this question.