Fig. 2
External acceleration (EA) and variation in EA (VAR) measured in Atlantic salmon during a critical swim speed (Ucrit) test (water velocity increments of 0.2 BL s−1). Tail beat frequency (beats min−1) was determined from 30-s video clips recorded during each swimming speed. Linear mixed-effects models were fit to log transformed data and equation parameters were extracted as follows: a \({\text{EA}}\, = \,3.6e^{{0.9*{\text{BL}}}} ,\) b \({\text{EA}}\, = \,4.9e^{{0.006*{\text{TBF}}}} ,\) c \({\text{VAR}}\, = \,5.0e^{{2.1*{\text{BL}}}}\) and d \({\text{VAR}}\, = \,11.4e^{{0.01*{\text{TBF}}}} .\) Data are means ± S.E.M.; n = 6 to 8