Figure 11. — Example of echogram from a high- resolution echo sounder showing midwater concentrations of fish be- 

 lieved to be lake herring. Echogram was made in Huron Bay on June 6, 1964. Distance traveled is 2 miles. 



CONCLUSIONS 



The research vessel Kaho made a six-cruise, 

 sxploratory trawling survey of the south shore 

 of Lake Superior. The aim of the study was 

 to obtain the basic biological information 

 necessary to establish more effective and 

 efficient fishing methods to harvest the existing 

 fish resources. 



The explorations successfully delineated 

 fishing grounds along about 65 percent of the 

 south shore and dennonstrated that limited 

 trawl fishing is practical for harvesting stocks 

 of commercial fish that are now virtually 

 ignored by the industry. Commercially signifi- 

 cant catches of chubs were taken on every 

 cruise. Good catches of smelt were made 

 during those seasons when fresh smelt are not 

 normally available. Occasionally, sizeable 

 quantities of suckers and common whitefish 

 were taken incertain areas. The most strategic 

 locations for trawlers would be: (1) Houghton 

 or Hancock, Mich., to fish the east shore of 

 the Keweenaw Peninsula to Huron Bay; (2) 

 Ontonagon, Mich., (3) Apostle Islands area 

 (between Bayfield, Wis., and Port Wing. Wis.); 

 and (4) Duluth, Minn., or Superior, Wis. 



LITERATURE CITED 



EDSALL,, THOMAS A. 



I960. Age and growth of the whitefish, 

 Coregonus clupeaformis , of Munis ing 

 Bay, Lake Superior. Trans. Amer. 

 Fish. Soc. 89: 323-332. 



GORDON, WILLIAM G., and KEITH BROUIL- 



LARD. 



1960. Great Lakes fishermen convert gill- 

 netters to trawling vessels. Fish Boat 

 5(8): 35-39. 



HILE, RALPH. 



1962. Collection and analysis of commer- 

 cial fishery statistics in the Great 

 Lakes. Great Lakes Fish. Comm., 

 Tech. Rep. 5, 31 pp. 



SMITH, STANFORD H., HOWARD J. 



BUETTNER, and RALPH HILE. 



1961. Fishery statistical districts of the 

 Great Lakes. Great Lakes Fish. Comm., 

 Tech. Rep. 2, 24 pp. 



APPENDIX 



The following seven tables summarize the 

 fishing logs for 340 exploratory trawl drags 

 in Lake Superior by the R/V Kaho between 

 November 1963 and October 1965. Each table 

 represents a summary of trawl drags in each 

 of the seven statistacal districts defined along 

 the south shore by Smith et al. (1961). Table 

 entries are primarily arranged by descending 

 depth stations and chronologically by cruise. 

 All but 14 drags were made with a 52-foot 

 (headrope) Gulf of Mexico type fish trawl. 

 Two drags made with a 40 -foot midwater 

 trawl (table 3) are footnoted, as are the 12 

 drags made with a 72 -foot (headrope) two- 

 seam wing trawl (table 4). 



16 



