Pavlov, D. S., M. A. Skorobogatov and L. G. Shtaf (1982).  Effect of turbulence 
on current velocity critical for fish. Doklady Biological Sciences.  267:1019-
1021.
	
Results of experiments with 21-29 mm long roach Rutilus rutilus demonstrated 
that the rate of turbulence had a pronounced effect on current velocity critical 
for single fish as well as for groups of 5 fish. Increasing the turbulence by 
40% decreased the critical velocity by 40-50%. Experiments with longer (31-39 
mm) fish showed that the critical current velocity was higher for groups of fish 
than for single individuals.