13 
8. In any undertaking for the artificial propagation of ciscoes in Lake Erie, 
at least for the region west of Long Point, particular attention should be given 
to L. eriensis, because of its rapid growth and its excellent qualities as a food 
fish. 
CONCLUSION 
This study has proved to be merely preliminary. The ciscoes of Lake Erie 
form a complex association and it has been impossible in this investigation to 
determine their inter-relations or to study the physical factors in relation to 
the various forms. Solution of the many difficult problems must await a 
thorough study of the physical conditions of existence in the various parts of 
the lake, such as distribution of temperatures, oxygen, carbon dioxide, currents, 
etc., and the relation of these factors to spawning, growth, movements of the 
fish, as well as to the production and distribution of their food organisms. 
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