
TY  - JOUR
A1  - Richardson, BJ 
T1  - Distribution of protein variation in skipjack tuna (<I>Katsumonus pelamis</I>) from the central and south-west Pacific
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1983
VL  - 34
IS  - 2
SP  - 231
EP  - 251
KW  - 
UR  - https://doi.org/10.1071/MF9830231 
N2  - 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. 
ER  -

