Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/13/2020
Publication Date: 3/16/2020
Citation: Abernathy, J.W., Rawles, S.D., McEntire, M.E. 2020. USDA-ARS Stuttgart update of genetic and genomic resources contributing to hybrid striped bass aquaculture [abstract]. 2020 North Carolina Aquaculture Development Conference, March 12-14, 2020, New Bern, North Carolina. p.1.
Technical Abstract: White bass (Morone chrysops) is a parental species of hybrid striped bass, a fish of increasing commercial importance throughout the US. A chief constraint to the expansion of hybrid striped bass production arises from the use of wild-catch parents in breeding programs. This is costly, unsustainable and leads to uncontrolled variation in the offspring. Our goal is to advance progress in the genetic improvement of hybrids by building additional white bass resources to facilitate selective breeding for agriculturally important traits. Toward our genomics goal, we created a first-generation white bass genome assembly as well as multiple transcriptome datasets to complement our genome assembly. Improvement of genetic maps and development of molecular markers to discriminate sex, parentage and other critical traits are ongoing. Toward our fish genetics resource goal, wild white bass gathered from Arkansas, Texas and Alabama along with available domesticated strains are being used to establish a base breeding population for familywise evaluations of growth and nutrient utilization on alternative, sustainable diets. To evaluate existing fish stocks and create an even year-class, approximately 100 white bass full-sib families were spawned. Fish were reared in a completely indoor, controlled, bio-secure environment, with larviculture (rotifers and artemia) transitioning to manufactured starter diet. Fish were then fed to apparent satiation once daily on a custom formulated fishmeal-free diet. Gains were evaluated over a seven-month period. Top performers from each family were selected for propagation. The combination of these resources substantially expands the genetic toolbox for white bass, while the application toward white bass breeding will aid in its improvement through selective breeding. Progress on white bass resources will be presented and discussed.