Techniques for comparing genetics of fishes has greatly advanced from allozymes to mitochondrial DNA. Microsatellite DNA is now used to examine rockfish genetics.

Few studies have been conducted on the stock structure of Pacific ocean perch. Based on allozyme variation, it was concluded that Pacific ocean perch are genetically quite similar throughout their range, and genetic exchange may be the result of dispersion at early life stages. In contrast, preliminary analysis using mitochondrial DNA techniques suggest that genetically distinct populations of Pacific ocean perch exist. Another study found distinct genetic populations on a relatively small scale in British Columbia. Currently, genetic studies are underway which should clarify the genetic stock structure of Pacific ocean perch.

Because deepwater rockfish are subject to barotrauma, they are very difficult to tag. Therefore, most theories on the degree of movement have been based on genetics and speculation. Future genetic work should help answer these questions. In addition, in situ tagging devices such as those developed at Star-Oddi in Iceland might prove useful.

Contact:
Dana Hanselman
Auke Bay Laboratories
Alaska Fisheries Science Center, NOAA Fisheries

Ted Stevens Marine Research Institute
17109 Point Lena Loop Road
Juneau, AK 99801
Dana.Hanselman@noaa.gov