Hilej Ralph (continued) 



19360 Summary of investigations on the morphometry of the 



ciscOj Leucichthys artedi (Le Sueur), in the lakes of 



the northeastern highlands., Wisconsino Pap. Mich. 



Acado Scios ArtSj and Lett, <, Volo 21 (193^), PPo 6l9-63ii<, 



Summary of research reported in full in 1937 paper. 



1937. Morphometry of the cisco. Leucichthys artedi (Le Sueur), 

 in the lakes of the northeastern highlands, Wisconsin, 

 Internato ReVo der ges. Hydrob» \ind Hydrog„s Bdo 36, 

 Heft 1/2, S. 57-130. 



Comparison of morphological characteristics of four 

 stocks of widely differing growth rateso Present elaborate 

 division of artedi into subspecies is held to be without demon- 

 strated validity by reason of § nsgative oorrelationj both be- 

 tween and within stocks, between growth rate and eye diameter 5 

 and length of head^ maxillary, paired fins, and dorsal fini 

 progressive change of body proportions with increase in lengthy 

 and existence of significant differences between year classes 

 of same stock in both proportions and numerical characters. 



1937. The increase in the abundance of the yellow pike-perch, 

 Stizostedion vitreum (Hit chill), in Lakes Huron and 

 Michigan, in relation to the artificial propagation of 

 the specieso Transo Atoo Fisho Soc, Vol, 56 (1936), 

 pp. Iii3-l59. 



Comparison of plantings of yellow pikeperch (walleyes) with 

 later production and abundance (on catch-per-net basis) to esti- 

 mate value of artificial propagatr-ion. No evidence of benefits 

 was found. 



19iilo Age and growt.h of the rock bass, Ambloplites rupestris 

 (Raf inesque) , in Nebish Lake, Wissonsin. Trans. Wis. 

 Acad, Scio <, Arts, and Lett.^ Vol, 33? PPo l89=-337. 



Study of fluctuations in growT.h and strength of year 

 classes of rock bass in a 95-acre landlocked lake. Growth was 

 correlated positively with temperat'ores in June and September 

 (germinal months of the growing season) and with precipitation in 

 June. The strength of year classes was correlated positively with 

 temperature and precipitation in May, June, and July, Other topics 

 treated includes criteria for testing validity of annulus as a year- 

 mark; sex and age differences in progress of season's growth; growth 

 compensation as a real and as an '-apparent" phenomenon^ relation of 

 growth rate to size and age at maturity, annual and seasonal fluc- 

 tuations in the length- weight relationship 5 sex ratio. 



