Reference |
Bartley, D. M., Kent, D. B., and M. A. Drawbridge. 1995. Conservation of genetic diversity in a white seabass hatchery enhancement program in Southern California. 1995. American Fisheries Society Symposium 15:249-258. |
Abstract |
Protocols for the conservation of genetic diversity of white
seabass Atractoscion nobilis by the Ocean Resources Enhancement and Hatchery
Program (OREHP) in the Southern California Bight region are presented. Three
main factors are addressed by these protocols: (1) the genetic structure of
the wild population, (2) the genetic structure of the hatchery group used
for enhancement, and (3) the monitoring of both enhanced and hatchery
populations during the enhancement effort. Furthermore, it is necessary to
define the objectives of the enhancement effort in order to adapt protocols
to meet specific conservation and production goals. Information on the genetic structure of wild and cultured white seabass has been assessed by means of starch gel electrophoresis of allozymes. Bartley and Kent (1990) found that the wild white seabass population is characterized by little population subdivision with rare alleles, those at a frequency of occurrence of approximately 2%, contributing to the differences between sampling locations. Based on this information, OREHP established a goal to preserve these rare alleles in the hatchery product. Determination of effective population size by analysis of linkage disequilibrium in hatchery progeny and binomial sampling theory indicated that approximately 150 adult wild-caught white seabass of equal sex ratio were needed to achieve this goal in the hatchery. A broodstock management plan to maintain genetic diversity, including rotation of broodfish among spawning tanks and the infusion of the progeny and continued assessment of estimated effective population size is recommended because it is not known precisely how individual adults will adapt to and spawn in the hatchery environment, or how the genetic structure of the resulting progeny will change. |
Tag |
Coded Wire Tag (CWT) |
Objective |
Evaluate stocking programs |
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