(0.8–1.8 m s) over the first 100 ms. However, the peak Key words: fast-start, efficiency, power, northern pike, Esox lucius. D R

uv Accepted 24 April 1995The body form of the northern pike is considered favourable for acceleration performance (Webb, 1978; Harper and Blake, 1990; Frith and Blake, 1991). The long and slender body allows for large-amplitude movements and large angles of attack of the posterior portion of the body, where most thrust is generated (Frith and Blake, 1991). In addition, the posterior placement of the dorsal and anal fins increases the surface area of the caudal region and contributes to thrust production (Webb, 1977; Weihs, 1973). The high percentage of body musculature and large proportion of white, anaerobically fuelled muscle also favour high power output, and thus thrust production, during short bursts of activity (Webb, 1978). High-powered bursts of acceleration by fish from a restin