MRAZ, DONALD. 



1964b. Age, growth, sex ratio, and maturity 

 of the whitefish in central Green Bay 

 and adjacent waters of Lake Michigan. 

 U.S. Fish Wildl. Serv., Fish. Bull. 

 63:619-634. 



nnales. Average destruction of fish per 

 lamprey was 18.5 pounds; in nature, 

 this figure may be twice as great. 

 Few fish survived lamprey attacks and 

 most survivors later died of secondary 

 infections. 



Seven samples of whitefish (819 

 fish) from five localities in central 

 Green Bay (1948-49 and 1951-52), and 

 a single collection (204 fish) just outside 

 Green Bay in Lake Michigan proper 

 (1948) permitted comparisons between 

 various points in the Bay and between 

 the Bay and the Lake. Green Bay white- 

 fish grew faster and were heavier, 

 length for length, than those from Lake 

 Michigan. The length advantage of 

 Green Bay fish was greatest at 3 years 

 (calculated lengths of 16.0 and 13.8 

 inches). The weight advantage was 

 greatest at 9 years (calculated weights 

 of 96.2 and 84,0 ounces). Within the 

 Bay, growth and the length-weight re- 

 lation differed among localities but 

 differences between two samples at a 

 single locality were equally great. The 

 whitefish of central Green Bay was 

 treated, therefore, as a single stock. 

 The 1943 year class was dominant or 

 strongly represented in all 1948-49 

 samples; 1951-52 collections all were 

 dominated by age-group III. All fish 

 older than age-group III were mature. 



NIELSEN, WILLIS L., vide: VERNON C. 

 APPLEGATE; ALBERTON L. McLAIN. 



NORDEN, CARROLL R. 



1961. The identification of larval yellow 

 perch, Perca flavescens , and walleye, 

 Stizostedion vitreum . Copeia 1961(3): 

 282-288. 



Gives a series of characters-- 

 measurements, counts, onset of ossifi- 

 cation of various bones--for the 

 separation of larvae and post-larvae of 

 yellow perch and walleye. Drawings 

 illustrate certain differences. Pigmen- 

 tation proved useful but not highly 

 dependable as a character. 



PARKER, PHILLIP S., and ROBERT E. 

 LENNON. 

 1956. Biology of the sea lamprey in its 

 parasitic phase. Fish Wildl. Serv., Res. 

 Rep. 44, iii + 32 p. 



Sea lampreys reared in aquariums 

 through the parasitic phase grew less 

 rapidly than wild lannpreys but never- 

 theless attained maturity. Females 

 made more attacks, fed more, killed 

 more fish, and grew larger than did 



PARSONS, JOHN W. 



1958. Fishery managennent problems and 

 possibilities on large southeastern 

 reservoirs. Trans. Anner. Fish. Soc. 

 87:333-355. 



The four main types of large reser- 

 voirs--flood control, power, storage, 

 and mainstream--are described. In 

 each type, the inefficient and highly 

 selective exploitation of fish stocks 

 offers a major problem. Managennent 

 measures are listed to obtain better 

 balanced fish populations and sounder 

 exploitation. Connmercial fishing is 

 needed in most, if not all, reservoirs. 

 Managennent of fisheries in tailwaters 

 and tributaries also is reviewed. 



PATTERSON, MATT, vide: VERNON C. 

 APPLEGATE. 



PERLMUTTER, ALFRED. 



1951. An aquarium experinnent on the 

 American eel as a predator on larval 

 lampreys. Copeia 1951(2): 173- 174. 



A controlled experinnent proved that 

 eels located and destroyed larval 

 lannpreys in the bottom nnud of an 

 aquariunn. Importation of eels is sug- 

 gested as a possible nnethod of biolog- 

 ical control of the sea lannprey in the 

 upper Great Lakes. 



PIAVIS, GEORGE W. 



1961. Embryological stages in the sea 

 lannprey and effects of tennperature on 

 developnnent. U.S. Fish Wildl. Serv., 

 Fish. Bull. 61:111-143. 



Eighteen developmental stages from 

 zygote to larva are described and 

 illustrated; connparisons are given with 

 previous descriptions of stages. Sea 

 lannpreys were reared fronn artificially 

 fertilized eggs at 5 intervals of 

 temperature from 45° F. to 80° F. and 

 at 52.5° and 77.5° F. No viable burrow- 

 ing larvae were produced at any 

 tennperature below 60° F. or above 

 70° F. O p t i nn u nn temperature was 

 65° F., which yielded 78-percent sur- 

 vival to the burrowing stage. Rate of 

 developnnent and highest stage reached 

 are described for each temperature. 



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