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amount of growth anal fin April August average length average sizes average weight Beauly Bunchrew calculated lengths cent centimetre coast comparison considerable Crosskirk curve Diagram difference dorsal fin erosion evidence February figures following table fresh water Graph grilse hatching head length inches kelt Kintradwell lamprey Length in Cms length increment Loch Lomond long absence March measurements miles month to month Moray Firth nets non-spawned number of fish old smolts older once-spawned one-year parr length powan previously spawned fish proportion recaptured River Beauly River Helmsdale River Spey salmon Salmon Fisheries sample Scotland sea feeding sea trout season short absence shows small numbers smolt ages smolt fish smolt length smolts at migration spring fish Stationery Office summer fish Talmine three year smolts three years old Thurso Bay total catch total length weight and length Whitling winter band winters fish winters group Winters in Sea younger