Cooperative Research Units
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Lake Roosevelt burbot maturation study


December 2016 - October 2018


Sexual dimorphism in Burbot, Lota lota, can be difficult to discern as the species is seemingly monomorphic (Cott et al., 2013). Burbot spawn over a relatively short time frame (Arndt and Hutchinson, 2000; McPhail and Paragamian, 2000) indicating that the species has synchronous gonadal development. Reliable information regarding gametogenesis is required for population status assessment and harvest modeling. The objectives of this proposed work are to 1) describe gametogenesis and the endocrine profile in adult Lake Roosevelt Burbot, 2) develop non-invasive (ultrasound) and less-invasive (plasma sex steroids) tools to determine sex and stage of maturity, and 3) develop non-invasive (egg diameter via ultrasound) and non-lethal invasive (collection of gametes through catheterization) tools to predict spawning readiness and successful spawning.


Current Staff

Federal Staff: 101

Masters Students: 239

Phd Students: 154

Post Docs: 55

University Staff: 241

5 Year Summary

Students graduated: 695

Scientific Publications: 1962

Presentations: 4417



Funding Agencies

  • US Fish and Wildlife Service


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey