Population variation in the mitochondrial cytochrome b gene of the orange roughy Hoplostethus atlanticus and the hoki Macruronus novaezelandiae

To describe the genetic relationship among regional populations of two commercially valuable species of marine fish, the orange roughy Hoplostethus atlanticus and the hoki Macruronus novaezelandiae, the mitochondrial DNA haplotypes of 59 individuals were defined by direct sequencing of the cytochrome b gene

C. S. Baker; A. Perry; G. K. Chambers; P. J. Smith

2004

Scholarcy highlights

  • To describe the genetic relationship among regional populations of two commercially valuable species of marine fish, the orange roughy Hoplostethus atlanticus and the hoki Macruronus novaezelandiae, the mitochondrial DNA haplotypes of 59 individuals were defined by direct sequencing of the cytochrome b gene
  • Samples of orange roughy were collected on four fishing grounds around New Zealand, one off the west coast of Tasmania and one near South Africa from 1990–1991
  • Samples from hoki were collected on three fishing grounds around New Zealand and one off Tasmania during the same period
  • Sequence variation allowed the definition of 9 unique orange roughy haplotypes and 5 hoki haplotypes
  • Differences in haplotype frequencies of orange roughy from New Zealand, Tasmania and South Africa were not significant, and the most common haplotype was found in similar frequencies in these three geographically distant regions
  • The contrasting patterns of low but regionally subdivided genetic variation in the hoki versus high but geographically undifferentiated genetic variation in the orange roughy may be attributed to the low fecundity, slow maturation and long lifespan of the orange roughy relative to the hoki

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