Van Oosten, John ( continued) 



one each from Lake Nipigon and Lake Champlain) from 15 to 22 

 or 23 years old. Old whltefish are smaller in waters not 

 fished commercially than in commercially exploited areas. 



19U7o Mortality of smelt, Osmerus mordax (Hitchill), in Lakes 

 Huron and Michigan during the fall and winter of 19U2- 

 19li3o Trans. Am. Fish. Soc.., Vol, 7h (l9Uli) ^ PP. 310-337, 



Description of the spread of the mortality, evaluation of 

 the many suggested causes (bacterial or virus disease held to 

 offer the only explanation consistent with the facts), estimate 

 of loss of production to commercial and sport fishermen, demon- 

 stration of improved growth of smelt following the mortality, 

 and discussion of prospects for the recovery of smelt stocks., 



19i;8. Turbidity as a factor in the decline of Great Lakes 

 fishes with special reference to Lake Erie. Trans, 

 Am. Fish, Soc, Vol. 1$ (I9lip), ppo 281-322. 



Exhaustive treatment of the controversial question as to 

 whether increase of turbidity due to improper land use or im- 

 proper fishing has caused the decline of the Lake Erie fisheries. 

 Review of literature on effects of turbidity on fish is followed 

 by presentation of argument in support of conclusions: beach 

 erosion and wind action rather than crop-land erosion are prin- 

 cipal sources of turbidity in Lake Erie; levels of turbidity are 

 generally too low to affect fish adversely; trends in turbidity 

 since 1910-1915 have been downward, not upward as many have be- 

 lieved; fluctuations of turbidity have shown no correlation 

 with fluctuations of growth and strength of year classes; res- 

 toration of the fisheries must come through scientific fishery 

 management — not scientific farming. 



19h9. The present status of the United States commercial 

 fisheries of the Great Lakes, Trans, lUth N. Amc 

 Wildlife Confo, pp. 319-330. 



Discussion of depletion as exemplified by declining 

 production in the face of more intensive and efficient fishing. 

 Demonstrates from comparison of 1879-1903 and 1936-1914^ statis- 

 tics that total U. S, yield would have decreased much more but 

 for a large rise in the take of coarse fish. Includes data on 

 the decline in production of important species in individual 

 lakes. 



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