-57- 



reproduction during the second yearo 



6= Average volume of net plankton in surface waters of clear ponds 

 during the 1954 growing season was 8 times greater than in ponds 

 having intermediate turbidities; 12o8 times greater than in the 

 most turbid ponds „ 



7o In hatchery ponds, high turbidities reduced growth and total yield 

 of bass and bluegills but increased channel catfish production. 

 Individual catfish grew faster in clear ponds, but muddy ponds 

 yielded much greater total weights of channel catfish then either 

 clear or intermediate ponds = This was due to a higher rate of 

 survival. 



8u The presence of carp caused reduced growth of bass and bluegills 

 but ponds with carp produced greater yields of channel catfish and 

 young bluegills than ponds without carp= 



9, Sodium silicate proved effective in sustaining hatchery pond turbidities 

 Trtien introduced in suspension with finely divided clay, 

 10/^ Growths of largemouth bass, white crappies, and channel catfish were 

 much slower in turbid Heyburn than in clear Upper Spavinaw Beservoir, 

 as well as in all other Oklahoma reservoirs of similar age and size, 

 llfl2. Growth of flathead catfish was the most favorable of any Heybum 

 species studie^ and i*/f is apparently well adapted to the turbid 

 environment. ^ 

 12'3. The number of species, as well as individuals, of all scaled fishes 

 was low in turbid Heyburn reservoir, apparently due to a lack of 

 successful reproduction in the turbid and heavily silted waters and 

 due to competition from the better adapted catfishes. 



