Mraz, Donald 



1952. Movements of yellow perch marked 

 in southern Green Bay, Lake Mich- 

 igan, in 1950. Trans. Am. Fish. 

 Soc, Vol. 81(1951), pp. 150-161. 

 Analysis of data on recoveries in the 

 commercial fishery of 108 of 4,172 

 spawning yellow perch marked in 

 southern Green Bay in May 1950 by 

 strap tags attached to the operculum . 

 Recoveries indicated progressive 

 northward movement following spawn- 

 ing. Fish recaptured outside the 

 marking area averaged significantly 

 longer than those recaptured locally. 

 Rise of percentage return with in- 

 crease in size suggested greater 

 ability of larger fish to survive tag- 

 ging or to retain tags . Marking by 

 fin-clipping proved unproductive. 



Parker, Phillip S., and Robert E. Lennon 



1956. Biology of the sea lamprey in its 

 parasitic phase. Fish and Wild- 

 life Serv., Res. Rep. No. 44, 

 32 pp. 

 Sea lampreys reared in aquaria 

 through the parasitic phase grew less 

 rapidly than wild lampreys but never- 

 theless attained maturity . Females 

 made more attacks, fed more, killed 

 more fish, and grew larger than did 

 males. Average destruction of fish 

 per lamprey was 18.5 pounds; in 

 nature, this figure may be twice as 

 great. Few fish survived lamprey at- 

 tacks and most survivors later died 

 of secondary infections . 



Perlmutter, Alfred 



1951 . An aquarium experiment on the 

 American eel as a predator on 

 larval lampreys . Copeia, 1951, 

 No. 2, pp. 173-174. 

 A controlled experiment which proved 

 that eels located and destroyed larval 

 lampreys in the bottom mud of an 

 aquarium. Importation of eels is sug- 

 gested as a possible method of 

 biological control of the sea lamprey 

 in the upper Great Lakes. 



Pycha, Richard L., and Lloyd L. Smith, Jr. 

 1955. Early Life history of the yellow 



perch, Perca flavescens (Mitchill), 



in the Red Lakes, Minnesota. 



Trans. Am. Fish. Soc, Vol. 84 



(1954), pp. 249-260. 

 A study of tlie life history during the 

 first year of life with particular ref- 

 erence to: scale formation; body -scale 

 relation; timing and variability of 

 growth; length -weight relation; food 

 habits in relation to growth and sur- 

 vival. 



Smith, Bernard R., and Oliver R. Elliott 



1953. Movement of parasitic -phase sea 

 lampreys in Lakes Huron and 

 Michigan. Trans. Am. Fish. Soc, 

 Vol. 82 (1952), pp. 123-128. 



Recoveries from 219 parasitic -phase 

 sea lampreys tagged in northwestern 

 Lake Huron totalled 38 or 17.7 percent. 

 One was recaptured in northeastern 

 Lake Michigan and the remaining 37 

 in Lake Huron. Movement was gener- 

 ally southward; 5 individuals had 

 travelled more than 150 miles, 4 of 

 them to Canadian waters of southern 

 Lake Huron. 



Smith, Lloyd L., Jr., and Laurits W. Krefting 



1954. Fluctuations in production and 

 abundance of commercial species 

 in the Red Lakes, Minnesota, with 

 special reference to changes in the 

 walleye population. Trans. Am. 

 Fish. Soc, Vol. 83 (1953), pp. 

 131-160. 



An analysis of production statistics, 

 1917-1953, and of records of catch, 

 effort, and abundance, 1930-1953, with 

 special respect to the principal com- 

 mercial species, walleye and yellow 

 perch. Changes of walleye abundance 

 are independent of fishing pressure 

 but traceable to fluctuations of year- 

 class strength. Year-class strength 

 could not be correlated with abundance 

 of brood fish, abundance of competing 

 species, hatchery plantings, or weather 

 conditions. Provision for prediction of 

 abundance and flexible regulations is 

 recommended. 



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