
%0 Journal Article
%A Richardson, BJ 
%T Distribution of protein variation in skipjack tuna (<I>Katsumonus pelamis</I>) from the central and south-west Pacific
%J Marine and Freshwater Research
%D 1983/04/01
%V 34
%N 2
%P 231-251
%K 
%R https://doi.org/10.1071/MF9830231
%U https://www.publish.csiro.au/paper/MF9830231 
%X Forty-two loci were electrophoretically surveyed for protein variation in the skipjack tuna. A new polymorphism in guanine deaminase was found as well as low-frequency variation in glucosephosphate isomerase and adenosine deaminase. Average heterozygosity for the species was 0 032. The gene frequencies at four variable loci for 70 sample sets, each of approximately 100 animals, collected at locations throughout the South Pacific Commission region, are given. East-west clines in allele frequencies for carboxylesterase and guanine deaminase occur across the study area. There is also within-area heterogeneity in allele frequency at these loci. Previously proposed discrete-stock models and a new isolation-by-distance model for the population structure of skipjack tuna are examined in the light of the genetic data. 
