The 10:81 treatment could not be included into these analyses (since
the 81 RFL feeding level was not tested for all densities), so additional
post hoc tests (Scheffe F-tests) were used for pairwise comparisons
between all 10 treatments. These analyses also permitted to test for
differences between treatments with identical prey densities but
different combinations of fish density and feeding level (e.g. 10:9
versus 30:3 and 90:1). Stepwise multiple-regression analyses were
used to test for the preponderant influence of variables (feeding level,
prey density, fish density) on the variables under study (survival,
growth, food conversion). Null hypotheses were rejected at Pb0.05.