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Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 7, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

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Tuesday, January 29 • 11:40am - 12:00pm
(FISHERIES: INVERTEBRATES) Evaluating Impacts of Rainbow Trout Farming on Macroinvertebrates in Neotropical Streams in Ecuador

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AUTHORS: Dana G. Wessels, Biology Department, Grand Valley State University; Dr. Katherine Krynak, Department of Biological and Allied Health Sciences, Ohio Northern University; Dr. Ed Krynak, Department of Geography, Western University; Andrea Encalada, Universidad San Francisco de Quito, Ecuador; Dr. Eric Snyder, Biology Department, Grand Valley State University

ABSTRACT: Rainbow trout (Oncorhynchus mykiss) aquaculture has increased to accommodate growing human populations, but streams throughout the world are being adversely affected in the process. Understanding how stream ecosystems respond to trout farm effluent is necessary to propose well-informed management practices before habitat and biotic loss become unrecoverable. Our research compared macroinvertebrate communities and environmental parameters along two streams in the Pichincha region of Ecuador; one stream with five non-native rainbow trout farms, and the other stream without trout farms. Macroinvertebrates collected in non-trout farm and headwater (control) sites were compared to those collected at the outflow of the five trout farms. An analysis of similarity based on the non-metric multidimensional scaling analyses (NMDS) of the macroinvertebrate families in qualitative kick samples as well as the EPT genera from the Surber samples showed a significant difference between the three sampling groups (Global R = 0.536, p = 0.004 and Global R = 0.639, p = 0.001 respectively). SIMPER analyses determined the families and genera that contributed the greatest proportion of dissimilarity between the trout farm, non-trout farm, and headwater groups. The Andean Biotic Index pollution tolerance values and functional feeding groups of the most influential families were examined. AICc model selection and model averaging was used to evaluate potential environmental influence on macroinvertebrate community similarity. Model averaged parameter estimates of the interaction between specific conductivity (SC) and percent organic matter (OM) was predictive of the macroinvertebrate community differences between sampling sites from the kick samples. Our results indicated reduced water quality due to the effects of rainbow trout farm effluent. However, treatment methods are limited in this mountainous terrain. Therefore, we would suggest feeding efficiency and utilization of trout farm sludge as fertilizer to minimize the impact of these farms on the neotropical streams.

Tuesday January 29, 2019 11:40am - 12:00pm