R. Masuda et al., MITOCHONDRIAL-DNA DIFFERENTIATION BETWEEN 2 SYMPATRIC MORPHS OF STRIPED JACK NEAR JAPAN, Journal of Fish Biology, 46(6), 1995, pp. 1003-1010
Two sympatric morphs (type A with a vertebral number of 25 and type B
with a vertebral number of 24) of striped jack Pseudocaranx dentex (Bl
och & Schneider) were analysed genetically. A part of the 16S-rRNA reg
ion of mtDNA was amplified with polymerase chain reaction for 24 speci
mens, and a restriction enzyme fragment polymorphism showed significan
t differences between the two types. While all specimens sampled in Og
asawara were identified as type B, about 90% of striped jack in Oita w
ere type A and 10% were type B. Although the spawning areas of these t
wo types are still unknown, significant genetic differences between th
e two sympatric morphs show that recruitment and migration patterns mi
ght differ from each other. The current system suggests the possibilit
y that the juveniles of type B in Oita may migrate from the Ogasawara
Islands.