Account of the stripping, fertilization, 

 hatching (10 to 16 days at 67°-7lo F,), 

 early developnnent, growth, and behav- 

 ior. Observations were concluded after 

 21 weeks. 



reproductive capacity. Adult walleyes 

 were the principal predators on the 

 trout-perch. 



LENNON, ROBERT E. 

 PARKER. 



vide: PHILLIP S. 



LOEB, HOWARD A. 



1953. Sea lamprey spawning: Wisconsin 

 and Minnesota streams of Lake Superior. 

 Fish Wildl. Serv., Spec. Sci. Rep. Fish. 

 97, iii + 36 p. 



Report on the examination of all 

 tributaries in Minnesota, part of the 

 streams of Wisconsin, and the streams 

 of Grand Island. Streanns are classified 

 as to their "lamprey potential" on the 

 basis of spawning facilities, larval 

 habitat, and presence of natural or 

 manmade barriers to migration. 



LOEB, HOWARD A., and ALBERT E. HALL, 



JR. 



1952. Sea lamprey spawning: Michigan 



streams of Lake Superior. Fish Wildl. 



Serv., Spec. Sci. Rep. Fish. 70, iii + 68 p. 



Results of surveys of 869 streams in 

 1950 and 178 in 1951 (both figures 

 inclusive of tributaries) to ascertainoc- 

 currence of sea lamprey spawning runs 

 and to estimate productive potentials of 

 streams on basis of extent of spawning 

 grounds and larval habitat. Tentative 

 outline is given of control program 

 (based principally on electrical devices 

 and barrier dams) for the 194 streams 

 on which control ultimately may prove 

 necessary. 



LUNGER, GEORGE F., vide: RALPH HILE. 



MACY, PAUL T., vide: VERNON C. APPLE- 

 GATE. 



MAGNUSON, JOHN L., and LLOYD L. SMITH. 

 1963. Some phases of the life history of the 

 trout-perch. Ecology 44(l):83-95. 



Contains information on various 

 phases of the life history, including 

 body-scale relation, age and size com- 

 position, growth in length and weight, 

 growth compensation, sex ratio, spawn- 

 ing, and fecundity. Annual fluctuations 

 of growth were correlated positively 

 with degree-days but not with popula- 

 tion density. Year-class strength was 

 correlated positively with degree-days 

 and negatively with wind but not with 



MARQUETTE, WILLMAN 

 HOWELL. 



M., vide: JOHN H. 



MARSHALL, J. S., A.M. BEETON, and D. C. 

 CHANDLER. 

 1964. Role of zooplankton in the freshwater 

 strontium cycle and influence of dis- 

 solved salts. Proc. Int. Ass. Theor. 

 Applied Limnol. 15(2):665-672. 



Experiments were made with Daphnia 

 magna to determine factors affecting 

 the uptake of strontium. Around 95 

 percent of an animal's strontiunn is in 

 the exoskeleton and is lost upon nnolting. 

 Strontium accumulates in the organism 

 due to active metabolic uptake of the 

 elennent directly from water. The ratio 

 Sr/Ca seems to remain constant, al- 

 though it varies in the environment. 



McLAIN, ALBERTON L. 



1952. Diseases and parasites of the sea 

 lamprey, Petromyzon marinus , in the 

 Lake Huron basin. Trans. Amer. Fish. 

 Soc. 81:94-100. 



Results of examination of 215 recently 

 transformed young, 29 active feeders 

 from the Lake, and 257 sexually mature 

 upstream migrants. Evidence of disease 

 was small. Percentages of parasitic 

 infestation were: recently transformed 

 young--2.3; Lake feeders--31.0; sex- 

 ually mature lampreys-- 14.8. Young 

 lampreys harbored nematodes only; last 

 two groups carried acanthocephalans, 

 nematodes, and cestodes. Parasites are 

 considered unimportant as a natural 

 control of the lamprey. 



McLAIN, ALBERTON L. 



1957. The control of the upstream move- 

 ment of fish with pulsated direct 

 current. Trans. Amer. Fish. Soc. 

 86:269-284. 



Alternating-current barriers placed 

 in streanns to block spawning runs of 

 sea lampreys in sonne situations cause 

 heavy mortalities of useful fish. To 

 reduce this loss a direct-current di- 

 version device is placed downstream. 

 This equipment is described and the 

 circuitry is illustrated. Most significant 

 feature is the introduction of the nega- 

 tive field into the stream. Fish are 



26 



