62 



Fishery Bulletin 88(1), 1990 



sampled: Aat-2, Ak, Aeon. Adh-1. Ck-B, Est-1, Est-2, 

 Fum, Gpi-A, Gdh, Gapdh-1, G.3pdh-B, Ldh-A, Ldh-B, 

 Ldh-C, Mdh-A, Mdh-B, Mdh-m, Pro-1, Pro-3. Pro-5, and 

 Xdh. The remaining 21 loci were polymorphic either 

 within or between species (Table 2). 



Genetic similarity values for the three pairwise com- 

 parisons (Table 3) were between 0.70 and 0.85, which 

 is near the high end of the range of genetic similarity 

 values found between congeneric fish species (Shaklee 

 et al. 1982, Thorpe 1983). Nevertheless, each species 

 pair can be distinguished on the basis of apparent fixed 

 differences at multiple gene loci. The samples of 

 Paralahrax clathratus and P. nebulifer shared no 

 alleles at seven presumptive gene loci (Adh-2, Ck-A, 

 G6pdh, Icdh-S, Pgdh, Pro-4, Sod); P. clathratus and 

 P. maculatofasciatus were distinct at six loci (Ck-A, 



