ENZYME VARIATION IN ORANGE ROUGHY, HOPLOSTETHUS-ATLANTICUS (TELEOSTEI, TRACHICHTHYIDAE), FROM SOUTHERN AUSTRALIAN AND NEW-ZEALAND WATERS

Orange roughy from six localities around the southern coasts of Austra lia showed no evidence of genetic subdivision when the products of 11 polymorphic enzyme loci were analysed electrophoretically. Samples ran ged in size from 84 to 171 per locality. Gene frequencies were very si milar in samples taken from New Zealand. The amount of total genetic d iversity attributable to subdivision among samples is estimated at 0.5 5 to 0.22%, but bootstrapping procedures showed that much of this dive rsity could arise from sampling error. A minimum of around 200 migrant s per locality per generation would be sufficient to maintain the obse rved genetic homogeneity, although actual numbers migrating are likely to be greater than this.