These authors reported a significant excess of rare alleles in populations of the Pacific cod, Gadus macrocqbhalus, but not in G. morhua. An important difference between the present study and that of GRANT and STAHL (1988) is the omission (by choice) of monomorphic RFLP loci. If expected num- bers of rare allozyme alleles are recalculated from 18 loci that exhibit polymorphism in Grant and Stahl’s study, a significant excess is observed (12 present with frequencies < 0.01 but only 6.7 expected), similar in magnitude to that in Mork et al.’s (1985) study.