Review of bacteriological and limno- 

 logical studies refuting contention that 

 pollution has been a significant factor 

 in the decline of Great Lakes fisheries, 

 outline of evidence that overfishing has 

 been the nnajor cause, and comments on 

 the innpossibility of adequate regulation 

 under divided control by the individual 

 States. 



HILE, RALPH. 



1932. Fish scales and commercial fish- 

 eries. The Fisherman (Grand Haven, 

 Mich.) l(10):3-4, 10. 



Description of nnethods of determin- 

 ing age and growth from scales and 

 examples of application to fishery 

 problems. 



HILE, RALPH. 



1934. Causes of variation in the growth 

 rates of fishes. The Fisherman (Grand 

 Haven, Mich.) 3(2):3-4, 10-11. 



Discussion of growth types and of 

 major factors responsible for growth 

 differences in different populations and 

 for fluctuations in growth within a single 

 stock. 



HILE, RALPH. 



1936b. Age determination of fish from 

 scales; method and application to fish 

 cultural problems. Progr. Fish-Cult. 

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



Description of methods in age-and- 

 growth studies. Comments on usefulness 

 of growth data in management of waters, 

 with special reference to planting pro- 

 grams. 



HILE, RALPH. 



1936c. Low production may not mean deple- 

 tion. The Fisherman (Grand Haven, 

 Mich.) 5(2):l-2. 



Demonstration, from comparison of 

 annual fluctuations of total yield and of 

 catch per net, of danger of estin-iating 

 abundance from production statistics. 



HILE, RALPH. 



1936d. Summary of investigations on the 

 morphometry of the cisco, Leucichthys 

 artedi (Le Sueur), in the lakes of the 

 northeastern highlands, Wisconsin. 

 Pap. Mich. Acad. Sci. Arts Lett, 21: 

 619-634. 



HILE, RALPH. 



1935. Daily reports reveal new facts and 

 figures. The Fisherman (Grand Haven, 

 Mich.) 4(12):l-2. 



Description of relation between fish- 

 ing time and catch of fish in various 

 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. 



HILE, RALPH. 



1936a. Age and growth of the cisco, 

 Leucichthys artedi (Le Sueur), in the 

 lakes of the northeastern highlands, 

 Wisconsin. U.S. Bur. Fish., Bxall. 48: 

 211-317. 



Comparison of four populations as to 

 growth rate, condition, sex ratio ... in 

 relation to such factors as population 

 density, abundance of plankton, and 

 physical-chemical conditions in lakes. 

 In order of arrangement growth rate 

 was correlated negatively with popula- 

 tion density and concentration of bound 

 C02. and condition was correlated nega- 

 tively with the abundance of plankton. 

 Differences 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. 



Summary of research reported in 

 full in 1937 paper. 



HILE, RALPH. 



1937a. Morphometry of the cisco, 

 Leucichthys artedi (Le Sueur), in the 

 lakes of the northeastern highlands, 

 Wisconsin. Int. Rev. ges. Hydrobiol. 

 Hydrogr. 36 (1/2): 57-130. 



Comparison of morphological char- 

 acteristics of four stocks of widely 

 differing growth rates. Present elab- 

 orate division of artedi into subspecies 

 is held to be without dennonstrated 

 validity by reason of: negative cor- 

 relation, both between and within stocks, 

 between growth rate and eye diameter, 

 and length of head, nnaxillary, paired 

 fins, and dorsal fin; progressive change 

 of body proportions with increase in 

 length; and existence of significant dif- 

 ferences between year classes of same 

 stock in both proportions and numerical 

 characters. 



HILE, RALPH. 



1937b. The increase in the abundance of the 

 yellow pike-perch, Stizostedion vitr eum 

 (Mitchill), in Lakes Huron and Michigan, 

 in relation to the artificial propagation 

 of the species. Trans. Anner. Fish. Soc. 

 66:143-159. 



17 



