ERKKILA, LEO F., vide: PAUL H. ESCH- 

 MEYER. 



ESCHMEYER, PAUL H. 



1953. The effect of ether anesthesia on fin- 

 clipping rate. Progr. Fish-Cult. 15{2): 

 80-82. 



Comparisons of clipping rate for in- 

 dividual operators on alternate days 

 when ether was and was not used indi- 

 cated that anesthesia improved the num- 

 ber of lake trout fingerlings marked per 

 hour by 75 to 100 fish or about 28 per- 

 cent. Differences between anesthetized 

 and unanesthetized fish with respect to 

 quality of mark and postmarking mor- 

 tality were snnall. 



ESCHMEYER, PAUL H. 



1955. The reproduction of lake trout in 

 southern Lake Superior. Trans. Amer. 

 Fish. Soc. 84:47-74. 



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; and relative accuracy 

 of three methods of estimating the num- 

 bers of eggs in ovaries. 



ESCHMEYER, PAUL H. 



1956. The early life history of the lake 

 trout in Lake Superior. Mich. Dep. 

 Conserv., Inst. Fish. Res., Misc. Publ. 

 10, 31 p. 



Materials collected by trawls and ex- 

 perimental gill nets yielded information 

 on various phases of the life history 

 during the first 3 years of life. Includes 

 data on: abundance; bathymetric distri- 

 bution and seasonal movements; 

 progress of season's growth; annual 

 increments; local differences of growth; 

 sex ratio; food habits according to size 

 of fish; and associated species of fish. 



ESCHMEYER, PAUL H. 



1957a. Note on the subpopulations of lake 

 trout in the Great Lakes. In John C. 

 Marr (coordinator). Contributions to 

 the study of subpopulations of fishes, 

 p. 129. U.S. Fish Wildl. Serv.. Spec. 

 Sci. Rep. Fish. 208. 



A brief statement of evidence of the 

 existence of subpopulations of lake trout 

 in the Great Lakes. This problem has re- 

 ceived little study, and opportunities for 

 investigation have disappeared or are 

 dwindling rapidly because of the de- 

 struction of lake trout stocks by the sea 

 lamprey. 



ESCHMEYER, PAUL H. 



1957b. The lake trout ( Salvelinus namay- 

 cush). U.S. Fish Wildl, Serv,, Fish, 

 Leafl. 441, 11 p. 



Popular account including a descrip- 

 tion of the fish and information on 

 distribution, habitat, reproduction, age 

 and growth, food, movements, and im- 

 portance in the commercial and sport 

 fisheries. The problem of destruction of 

 lake trout stocks by the sea lamprey 

 is reviewed briefly. 



ESCHMEYER, PAUL H. 



1957c. The near extinction of lake trout in 

 Lake Michigan, Trans. Amer. Fish. 

 Soc. 85:102-119. 



Following the collapse of the com- 

 mercial fishery for lake trout in Lake 

 Michigan in the late 1940's, the further 

 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 per- 

 cent of that prior to the sea lamprey 

 invasion, and by 1955 the trout was near 

 extinction- -only eight 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 de- 

 clined at similar rates and that lam- 

 preys, not commercial fishing, were 

 responsible for that decline. 



ESCHMEYER, PAUL H. 



1959. Survival and retention of tags, and 

 growth of tagged lake trout in a rearing 

 pond. Progr. Fish-Cult. 2 1( 1):17-21 . 



Survival and retention of Petersen, 

 cheek, and lower- jaw tags by 2- sum- 

 mer-old fish (86, 85, and 91 percent) 

 were not significantly below survival of 

 lake trout that had had the adipose fin 

 excised (96 percent). All upper- jaw tags 

 and 80.5 percent of the streamer tags 

 were lost in 7 months; 99.5 percent of 

 the streamer tags were lost in 1 year. 

 Tags reduced growth in length about 25 

 percent. Because the upper-jaw and 

 streamer tags which were lost in ponds 

 had given good results on larger native 

 lake trout in Lake Superior (details 

 given) it was concluded that experiments 

 with small fish in ponds do not provide 

 a basis for prediction of the usefulness 

 of a tag on fish in the Lake, 



ESCHMEYER, PAUL H, 



1964. The lake trout (Salvelinus namay- 

 cush), U.S, Fish Wildl, Serv,, Fish, 

 Leafl, 555, 8 p. 



14 



