of the problem of regulation . 



Jobes, Frank W. 



1932. Deep trapnets on Lakes Huron 

 and Michigan. The Fisherman, 

 Vol. 1, No. 3, pp. 3-4. 



An outline of the cooperative program 

 (with the Michigan Department of 

 Conservation) to study the effects of 

 this new and unusually efficient net 

 on stocks of whitefish. 



1933. Preliminary report on the age and 

 growth of the vellow perch ( Perca 

 flavescens Mitchill) from Lake 

 Erie, as determined from a study 



of its scales. Pap. Mich. Acad. 1949. 



Sci., Arts, and Lett., Vol. 17 



(1932), pp. 643-652. 

 Brief report on analysis of first two 

 years' collections in life history study, 

 including data on age composition 

 (evidence of phenomenal strength of 

 1926 year class) and growth in length 

 and weight. 



1943. The age, growth, and bathymetric 



distribution of Reighard's- chub, 



Leucichthys reighardi Koelz, in 



Lake Michigan . Trans. Am. Fish. 



Soc, Vol. 72(1942), pp. 108-135. 

 Life -history and distributional study 

 based on 1930-1932 collections by 

 experimental gill nets. Reighard's 

 chub spawned in May and June at 20- 

 79 fathoms; in other months was most 

 plentiful at 20-60 fathoms. Abun- 

 dance on east shore of lower half of 

 lake was seven times that on west 

 shore and three times that in northern 1952. 



part of lake. Age -group IV (average 

 length 10.9 inches; average weight 

 6.1 ounces) dominated samples. Fe- 

 males outnumbered males and survived 

 to greater age. 



1949. The age, growth, and bathymetric 

 distribution of the bloater, 

 Leucichthys hoyi (Gill), in Lake 

 Michigan. Pap. Mich. Acad. Sci., 

 Arts, and Lett., Vol. 33, (1947), 

 pp. 135-172. 

 Study of distribution from 1930-1932 

 collections from experimental gill nets 



and of growth from earlier (1919 and 

 1928) collections from Grand Haven, 

 Michigan. Bloaters were most plenti- 

 ful at 20-59 fathoms (with the larger 

 fish in the deeper water in some 

 months); abundance on east shore of 

 lower part of lake was 1-1/2 times 

 that on west shore and 2-1/3 times 

 that in northern part of lake. Samples 

 were dominated by age -group IV in 

 1919 and (weakly) by age -group II in 

 1928. Growth was slightly more rapid 

 in females than in males but was slow 

 in both sexes (barely 8 inches in 5 

 years). Females outnumbered males. 



The age, growth, and distribution 

 of the longjaw Cisco, Leucichthys 

 alpenae Koelz, in Lake Michigan. 

 Trans. Am. Fish. Soc., Vol. 76 

 (1946), pp. 215-247. 

 Study of distribution from 1930-1932 

 collections from experimental gill nets 

 and of growth from earlier (1923 and 

 192 8) collections. Longjaw was most 

 plentiful at less than 70 fathoms and 

 more than four times as abundant in 

 northern part of lake and along east 

 shore as on west shore of lower lake. 

 Samples were dominated by age -groups 

 III or IV. Growth was similar off 

 Grand Haven, Michigan, and in north- 

 eastern Lake Michigan (average length 

 about 11 inches and average weight 

 about 6-1/4 ounces at end of 4 years). 

 Sex ratio was variable but females 

 generally outnumbered males and 

 reached higher ages. 



Age, growth, and production of 



yellow perch in Lake Erie. Fish. 



Bull., Fish and Wildlife Serv., 



Vol. 52, pp. 205-266. 

 Review of production statistics, 1885- 

 1947, and detailed life history study. 

 Includes materials on validity of scale 

 readings, body-scale relationship, 

 size and age distribution, growth (in- 

 cluding annual fluctuations, length of 

 growing season, and growth compensa- 

 tion), length-weight relationship and 

 condition (including fluctuations by 

 month and year and according to age 

 and sexual state), maturity, and sex ratio. 



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