RELATION OF ADULT SIZE TO MOVEMENTS AND DISTRIBUTION OF SMALLMOUTH BASS IN A CENTRAL MAINE LAKE

Forty-four smallmouth bass Micropterus dolomieu of three size-classes were radiotracked in Green Lake, Maine, during summer 1993 (10 June-1 September) to determine whether adult size influenced distribution and movement. Large smallmouth bass (>406 mm) used deep water (>8 m) more often than did small (248-279 mm) or medium-sized (305-356 mm) smallm outh bass during the late summer (15 July-1 September). Large smallmou th bass also were found at middepths (4-8 m) significantly more often than were small individuals during late summer. Small fish used cover more frequently than large ones during early summer (10 June-13 July). Both small and medium-sized individuals were associated with cover mo re frequently than large smallmouth bass were during the late summer. Small smallmouth bass exhibited significantly smaller summer total ran ges than did large individuals, and mean active displacement differed among all three size-classes.