ASSOCIATION OF ALLOZYME HETEROZYGOSITY WI TH GROWTH-RATE AND ECOLOGICAL DIFFERENTIATION IN BROWN TROUT SALMO-TRUTTA L

In three populations of brown trout, differences in allozyme heterozyg osities between different ecological forms were estimated. The ecologi cal forms examined were immature, sea-run migratory, and resident fres hwater (stream and lake-river). In addition, individuals with differen t growth rates were studied. Stream (dwarf) males were shown to have h igher heterozygosity than other ecological forms; resident females and lake-river males exhibited low heterozygosities. In one out of two te sts, rapidly growing individuals were shown to have higher heterozygos ity than slowly growing ones. Adaptive significance of intrapopulation genetic differentiation in brown trout and importance of investigatio n of this species for developing measures for its conservation and rep roduction are emphasized.