Sevigny et a\ Identification and distribution of larvae or Sebastes fosdatus and S mentella 



385 



> 



o 

 u 



e 

 z 



100 

 80 

 60 

 40 



20 







1991 



1992 



All genotypes 



Mean = 8.70 

 S.E. = 0.05 



MDH*A1A1 



Mean = 9.26 

 S.E. = 0.06 



Mean = 8.35 

 S.E. = 0.03 



p'fi[iit H i'ii|i 



Mean = 8.45 

 S.E. = 0.03 



MDH*A1A2 



Mean = 9.15 

 S.E. = 0.10 



lffj' M I||l|i|t 



l[III H I|l|[l'll|l 



Mean = 8.66 

 S.E. = 0.06 



ii i i|iiii|iiii 





MDH* A2A2 



Mean = 7.37 

 S.E. = 0,07 



lpl lH I MH I|l|||l|l|l 



4.0 6.0 8.0 10 12 14 



FT^T^' 



Mean = 7.39 

 S.E. = 0.08 



4.0 6.0 



ni|iiii|iiii[ nn | nn |i 



10.0 12.0 14.0 



Standard length (mm) 



Figure 6 



Distribution of standard lengths of all redfish larvae analyzed for MDH variation in 

 1991 and 1992 by year and genotypes. 



than with S. fasciatus. The geographic distribution 

 of the heterozygote larvae also matched closely that 

 of the genotype MDH^AIAI. 



Overall, clear geographic patterns in the abun- 

 dance and the geographic distribution of redfish 

 larval genotypes were observed in the Gulf of St. 

 Lawrence. In both sampling years redfish larvae 

 were mainly concentrated in offshore areas associa- 

 ted with the deep (>200 m) waters of the Lauren- 



tian and Esquiman Channels, as previously reported 

 (Kenchington, 1991;deLafontaineetal., 1991;Runge 

 and de Lafontaine, 1996). The high abundance of 

 redfish larvae on the southeastern side of Anticosti 

 Island is consistent with the observed occurrence of 

 gravid redfish during May and June in the same 

 area(St-Pierre and de Lafontaine, 1995). High abun- 

 dance of larval redfish east of Anticosti Island has 

 been frequently observed from mid-May to mid-June 



