Total length ( L T ) (range 24–1000 mm; mean ± s.e . = 170·21 ± 0·36 mm) and mass ( W ) (range 0·10–9590 g; mean ± s.e . = 76·03 ± 0·87 g) of 36 460 specimens of marble trout Salmo marmoratus were used to compute a standard mass ( W s ) equation for this species by means of the empirical percentile (EmP) method. The EmP W s equation calculated was: log 10 W s = −5·208 + 3·202 log 10 L T − 0·046 (log 10 L T ) 2 ( L T range 90–5...

Total length ( L T ) and mass measurements of 28 596 specimens of European chub Leuciscus cephalus , collected from a variety of waterways across Italy, were used to compute standard mass ( W s ) equations by both empirical percentile (EmP) and regression line percentile (RLP) methods. The use of the EmP W s equation [log 10 W s = −4·79 + 2·68log 10 L T + 0·10(log 10 L T ) 2 ] to compute relative mass ( W r ) of L. cephalus in...