Duden, William R. 



1933. . Recent advances in the fishing in- 

 dustry. Part I, The Fisherman, 

 Vol. 2, No. 10, pp. 3-4 and 10- 

 11; Pt. II, Vol. 2, No. 12, pp. 

 3-4 and 10. (Reference to Part II 

 is for first of two issues labeled 

 No. 12.) 

 Summary of developments in process- 

 ing, transportation, marketing, ad- 

 vertising, and the utilization of 

 by-products. 



Erkkila, Leo F., Bernard R. Smith, and 

 Alberton L. McLain 

 1956. Sea lamprey control on the Great 

 Lakes 1953 and 1954. Fish and 

 Wildlife Serv . , Spec. Sci. Rep.-- 

 Fish. No. 175, 27 pp. 

 Summary of operations of electrical 

 control devices in tributary streams 

 along the south shore of Lake Superior 

 and in northern Green Bay, Lake 

 Michigan. Lists numbers of lampreys 

 and fish taken in different streams 

 and discusses the problem of minimiz- 

 ing the kill of useful species. Includes 

 biological data on lamprey runs. 



Eschmeyer, Paul H. 



1953. The effect of ether anesthesia on 

 fin-clipping rate. Prog. Fish- 

 Cult., Vol. 15, No. 2, pp. 80-82. 

 Comparisons of clipping rate for in- 

 dividual operators on alternate days 

 when ether was and was not used in- 

 dicated that anesthesia improved the 

 number of lake trout fingerlings 

 marked per hour by 75 to 100 fish or 

 approximately 28 percent. Differ- 

 ences between anesthetized and un- 

 anesthetized fish with respect to 

 quality of mark and post -marking 

 mortality were small . 



1955. The reproduction of lake trout in 

 southern Lake Superior. Trans. 

 Am. Fish. Soc, Vol. 84(1954) 

 pp. 47-74. 

 Presents data on : spawning seasons 

 and grounds; size at maturity; sex 

 ratio and size distribution of spawn- 

 ing fish; "homing" instinct of local 



stocks; fecundity of "lean" lake trout 

 and of siscowets; relative accuracy 

 of three methods of estimating the 

 numbers of eggs in ovaries. 



1956. The early life history of the lake 

 trout in Lake Superior . Mich . 

 Dept. Cons., Inst. Fish. Res., 

 Misc. Pub. No. 10, 31 pp. 



Materials collected by trawls and 

 experimental gill nets yielded informa- 

 tion on various phases of the life 

 history during the first 3 years of 

 life. Includes data on: abundance; 

 bathymetric distribution and seasonal 

 movements; progress of season's 

 growth; annual increments; local dif- 

 ferences of growth; sex ratio; food 

 habits according to size of fish; as- 

 sociated species of fish. 



1957. The near extinction of lake trout 

 in Lake Michigan . Trans . Am . 

 Fish. Soc, Vol. 85(1955), pp. 

 102-119. 



Following the collapse of the com- 

 mercial fishery for lake trout in Lake 

 Michigan in the late 1940 's, the fur- 

 ther decline of the trout stocks was 

 traced from records of small fish 

 caught in small-mesh gill nets fished 

 for chubs. By 1951 the abundance was 

 only 4 percent of that prior to the sea 

 lamprey invasion and by 1955 the trout 

 was near extinction- -only 8 fish were 

 caught in 5-1/2 million linear feet of 

 gill nets. Evidence is given that legal - 

 sized (1-1/2 pounds and larger) and 

 small trout declined at similar rates 

 and that lampreys, not commercial 

 fishing, were responsible for that 

 decline . 



1957. Note on subpopulations of lake 

 trout in the Great Lakes. In : 

 Contributions to the study of sub- 

 populations of fishes. Fish and 

 Wildlife Serv., Spec. Sci. Rep.-- 

 Fish. No. 208, p. 129. 

 A brief statement of evidence of the 

 existence of subpopulations of lake 

 trout in the Great Lakes. This prob- 

 lem has received little study and 



16 



