Hile, Ralph 1936. 



1935. Daily reports reveal new facts 

 and figures. The Fisherman, 

 Vol. 4, No. 12, pp. 1-2. 



Etescription of relationship between 

 fishing time and catch of fish in var- 

 ious types of stationary gear. 

 Suggests that increase of catch with 

 increase of nights out is so small 

 that frequent lifting will give most 

 efficient use of gear. 1937. 



1936. Low production may not mean de- 

 pletion. The Fisherman, Vol.5, 

 No. 2, pp. 1-2 . 



Etemonstration, from comparison of 

 annual fluctuations of total yield and 

 of catch per net, of danger of es- 

 timating abundance from production 

 statistics. 



1936. Age determination of fish from 



scales; method and applications 



to fish cultural problems. 



Prog. Fish-Cult., Bur. Fish. 



Memo. 1-131, No. 23, pp. 1-5. 

 Description of methods in age-and- 

 growth studies, with comments on 

 usefulness of growth data in manage- 

 ment of waters, with special refer- 

 ence to planting programs. 



1936. Age and growth of the Cisco, 1937. 



Leucichthys artedi (Le Sueur), in 

 the lakes of the northeastern high- 

 lands, Wisconsin. Bull . U.S. Bur . 

 Fish., Vol. 48,. pp. 211-317. 

 Comparison of four populations as to 

 growth rate, condition, sex ratiQ- • • 

 in relation to such factors as popula- 

 tion density, abundance of plankton, 

 and physical -chemical conditions in 

 lakes. In order of arrangement 

 growth rate was correlated negative- 

 ly with population density and 

 concentration of bound CO'2^ and 

 condition was correlated negatively 1941. 



with the abundance of plankton. Dif- 

 ferences among stocks as to length 

 of growing season contributed to dif- 

 ferences of growth rate. The relative 

 abundance of females was greater in 

 slow growing than in fast growing stocks 

 and increased with age . 



19 



Summary of investigations on the 

 morphometry of the cisco, 

 Leucichthys artedi (Le Sueur), in 

 the lakes of the northeastern high- 

 lands, Wisconsin. Pap. Mich. 

 Acad. Sci., Arts, and Lett., 

 Vol. 21 (1935), pp. 619-634. 



Summary of research reported in 



full in 1937 paper. 



Morphometry of the cisco, 

 Leucichthys artedi (Le Sueur), in 

 the lakes of the northeastern high- 

 lands, Wisconsin. Internat. Rev. 

 der ges. Hydrob. und Hydrog., 

 Bd. 36, Heft 1/2, S. 57-130. 

 Comparison of morphological char- 

 acteristics of four stocks of widely 

 differing growth rates. Present 

 elaborate division of artedi into sub- 

 species is held to be without demon- 

 strated validity by reason of: negative 

 correlation, both between and within 

 stocks, between growth rate and eye 

 diameter, and length of head, maxil- 

 lary, paired fins, and dorsal fin; 

 progressive change of body proportions 

 with increase in length; and existence 

 of significant differences between 

 year classes of same stock in both 

 proportions and numerical characters. 



The increase in the abundance of 

 the yellow pikeperch, Stizostedion 



vitreum (Mitchill), in Lakes Huron 

 and Michigan, in relation to the 

 artificial propagation of the species. 

 Trans. Am. Fish. Soc, Vol. 66 

 (1936), pp. 143-159. 

 Comparison of plantings of yellow 

 pikeperch (walleyes) with later pro- 

 duction and abundance (on catch -per- 

 net basis) to estimate value of artificial 

 propagation . No evidence of benefits 

 was found. 



Age and growth of the rock bass, 

 Ambloplites rupestris (Rafinesque), 

 in Nebish Lake, Wisconsin. 

 Trans. Wis. Acad. Sci., Arts, and 

 Lett., Vol. 33, pp. 189-337. 

 Study of fluctuations in growth and 

 strength of year classes of rock bass 

 in a 95-acre landlocked lake. Growth 



