The Effect of Fry Plantings on Whitefish Production in Eastern Lake Ontario

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Abstract
Whitefish fry were planted in the Bay of Quinte and adjacent waters in numbers varying from 208 millions in 1927 to none in 1945. Since 50% of the commercial whitefish catch from these waters consisted of five-year-old fish, whitefish production in each of the years from 1929 to 1951 was compared to the number of fry planted 5 years previously (1924–1946). No correlation could be found between the number of fry planted and the production of whitefish 5 years later. The largest number of fry planted (208 millions in 1927) was followed by the lowest production of the entire period (95 thousand pounds in 1932). On the other hand, following no planting in 1945, production in 1950 was approximately normal (162 thousand pounds).The age composition of the commercial catch in the years 1944–1951 was determined from scale samples. By applying the age composition to the total catches in these years the contributions of the year-classes 1940–1945 have been estimated. The number of fry planted probably did not affect the contribution of these year-classes to the fishery.

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