sources of turbidity in Lake Erie; 

 levels of turbidity are generally too low 

 to affect fish adversely; trends in tur- 

 bidity since 1910-15 have been down- 

 ward not upward as many have believed; 

 fluctuations of turbidity have shown 

 no correlation with fluctuations of 

 growth and strength of year classes; 

 and restoration of the fisheries must 

 conne through scientific fishery man- 

 agement--not scientific farming. 



VAN OOSTEN, JOHN. 



1949a. A definition of depletion of fish 

 stocks. Trans. Amer. Fish, Soc. 76: 

 283-289. 



A listing of situations not to be held 

 as synonymous with depletion followed 

 by the definition; ". . . reduction, through 

 overfishing, in the level of abundance of 

 the exploitable segment of a stock that 

 prevents the realization of the maximum 

 productive capacity." 



VAN OOSTEN, JOHN. 



1949b. Progress report on the sea lamprey 

 study. The Fisherman (Grand Haven, 

 Mich.) 17(3):6, 9-10. 



Outline of program and statement of 

 progress of cooperative researches of 

 the Great Lakes Sea Lamprey Com- 

 mittee composed of representatives of 

 the eight lakes States, the Province of 

 Ontario, and the Bureau. 



VAN OOSTEN, JOHN. 



1949c. The present status of the United 

 States commercial fisheries of the 

 Great Lakes. Trans. 14th N. Amer. 

 Wildl. Conf.: 319-330. 



Discussion of depletion as exempli- 

 fied by declining production in the face 

 of more intensive and efficient fishing. 

 Demonstrates from comparison of 

 1879-1903 and 1936-45 statistics that 

 total U.S. yield would have decreased 

 much more but for a large rise in 

 the take of coarse fish. Includes data on 

 the decline in production of important 

 species in individual Lakes. 



VAN OOSTEN, JOHN. 



1949d. The sea lamprey--a threat to Great 

 Lakes fisheries. State Govt. 22(12): 

 283-284, 289. 



History of penetration and spread of 

 the sea lamprey in the upper Great 

 Lakes, records of losses of production 

 of lake trout from lamprey depredations 

 in Lakes Huron and Michigan, comments 



on the lamprey as a threat to the Lake 

 Superior lake trout and to other species 

 in all three Lakes, and outline of cur- 

 rent and proposed sea lannprey research. 



VAN OOSTEN, JOHN. 



1950. Progress report on the study of 

 Great Lakes trout. The Fisherman 

 (Grand Haven, Mich.) 18(5):5, 8-10; 

 (6):5, 8. 



Outline of program of Great Lakes 

 Lake Trout Committee (composed of 

 representatives of States bordering the 

 upper Lakes, the Province of Ontario, 

 and the Bureau) and report on results of 

 plantings of about 400,000 fin- clipped 

 fingerlings in northern Lake Michigan 

 in 1944-46. Includes analysis of the data 

 on the approximately 1,200 recoveries 

 made through 1949 with respect to 

 movement from planting locality, time 

 out before recapture, growth. Presents 

 also information on similar but smaller 

 scale experiments in Lakes Huron and 

 Superior and on growth in Lake Michigan 

 as determined from scale studies of 

 samples from the commercial catch. 



VAN OOSTEN, JOHN. 



1953. A modification in the technique of 

 computing average lengths from the 

 scales of fishes. Progr. Fish-Cult. 

 15(2):85-86. 



A demonstration that: estimates of 

 the lengths of fish at the end of different 

 years of life based on average scale 

 measurements differ insignificantly 

 from the averages of the calculated 

 lengths of individual fish; the use of 

 total lengths in growth calculations 

 yields essentially the sanne results as 

 are obtained when standard lengths 

 are calculated and subsequently con- 

 verted to total lengths. 



VAN OOSTEN, JOHN. 



1956. The lake sturgeon. In Our endangered 

 wildlife, p. 9-10. Nat. Wildl. Fed., 

 Washington, D.C. 



Slow growth (large fish may be 150 

 years old or older) and late maturity 

 (first spawning at about 20 years) nnade 

 the sturgeon highly susceptible in the 

 Great Lakes to the deliberate destruc- 

 tion of the early years, the later over- 

 fishing, and more recently to adverse 

 changes of the environment. Great Lakes 

 stocks are so reduced that extinction is 

 threatened in some areas. Problems of 

 restoration are difficult. 



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