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We compared predat~on nsk for flsh whlch ddfered In age at metamorphosis but not In length and for those w h ~ c h differed In length at metamorphosis but not In age uslng laboratory-reared winter flounder Pleuronectes amencanus Palrs of fish were offered to lndlvldual predatory shnrnp Crangon septemsplnosa as prey in a senes of laboratory predat~on tnals In the size experiments prey length dlffered on average by 0 5 mm (8%), but age was identical We could not detect a difference In the number of captures of small and 'large' lndiv~duals In 104 tnals where only 1 prey was consumed In the age experiments, prey age differed by 9 d (18% on average), but length was virtually ident~cal We could not detect a difference in the number of captures of young and 'old' metamorphosing 1nd1viduals in 56 tnals where only 1 prey was consumed Moreover t ~ m e until capture did not vary with increasing age at metamorphos~s over a range of 35+ d These results suggest that any differences In predation risk between fish which exh~b i t the range of ages and sizes at metamorphosis represented In our experiments are subtle and are potentially ecologically inconsequential This work comblned with that of others quest~ons the validity of the inference that for marlne fishes. ind~viduals w h ~ c h are largeat-age have a survival advantage during the early llfe history perlods

Predation risk during the early life history periods of fishes: separating the effects of size and age