Hilsj Ralph (continued) 



193l;o Causes of variation in the growth rates of fisheso 

 The Fishermanj Volo 3? Noo 2^ ppc 3-li and 10-11. 



Discussion of growth types and of major factors re- 

 sponsible for groxrth differences in different populations 

 and for fluctuations in growth within a single stock. 



1935 » Daily reports reveal new facts and figures » The Fisher- 

 man^ Volo h} No« 12, pp. 1-2. 



Description of relationship between fishing time and 

 catch of fish in various types of stationary gearc Suggests 

 that increase of catch with increase of nights out is so small 

 that frequent lifting will give most efficient use of gear. 



19360 Low production may not mean depletion. The Fisherman^ 

 Vol, 5, No, 2, ppo 1-2, 



Demonstration, from comparison of annual fluctuations 

 of total yield and of catch per net, of danger of estimating 

 abundance from production statistics » 



19360 Age determination of fish from scales; method and ap- 

 plication to fish cultural problems. The Prog, Fish- 

 Cult., Bur, Fish. Memo, 1-131, No. 23, pp.. 1-^. 



Description of methods in age-and- growth studies, with 

 comments on usefulness of growth data in management of waters, 

 with special reference to planting programs. 



1936, Age and growth of the cisco, Leucichthys artedi (Le Sueur), 

 in the lakes of the northeastern highlands, Wisconsin. 

 Bull. U« So Buro Fish,, Vol, U8, pp. 211-317. 



Comparison of four populations as to growt.h rate, condi- 

 tion, 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 population density and concentration of bound 

 CQfti, and condition was correlated negatively with the abundance 

 of plankton. Differences among stocks as to length of growing 

 season contributed to differences of growth rate. The relative 

 abundance of females was greater in slow growing than in fast 

 growing stocks and increased with age. 



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