Title:
Lamprey Decay Study
Authors:
Leah Gunnier – Heritage University
Faculty Mentor -
Alex Alexiades - Associate Professor of Environmental Science, Heritage University
Institution/ Department:
Yakama Nation Fisheries Lamprey Project
Abstract:
Pacific Lamprey (Entosphenus tridentatus) decomposition rates across life stages remain understudied, despite their ecological significance. This study examined decomposition patterns across seven various phases of their three life stages (eggs, prolarvae, first-feeding larvae, small larvae, large larvae, juveniles, and adults) in three environments: outdoor tanks, temperature-controlled storage units, and mesh-covered PVC chambers submerged in a canal near the Prosser Fish Hatchery. Specimens were monitored twice weekly for changes in mass, length, fungal colonization, and macroinvertebrate activity, with concurrent documentation of environmental conditions and water temperature. Results revealed rapid decomposition of early life stages (eggs, prolarvae, and first-feeding larvae) across all environments. Small larvae persisted approximately three weeks, while large larvae, juveniles, and adults remained intact beyond one month. This research provides insight into Pacific Lamprey decomposition rates and their environmental impacts across different aquatic settings.