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Poor growth of rainbow trout (Oncorhynus mykiss)fed New Zealand mud snails (Potamopyrgus antipodarum)
North American Journal of Fisheries Management (2008)
  • Mark R. Vinson
  • Michelle A. Baker, Utah State University
Abstract
The New Zealand mud snail (NZMS) Potamopyrgus antipodarum is rapidly invading North American freshwaters, leading to speculation that native fisheries, especially those involving trout, will be negatively impacted. To assess whether trout would consume NZMSs and could assimilate nutrients from them, we conducted a laboratory 15N tracer study, a laboratory feeding study, and bioenergetics modeling with rainbow trout Oncorhynchus mykiss; we also evaluated 5 years of diet and condition data describing rainbow trout and brown trout Salmo trutta collected from a river colonized by NZMSs. The 15N tracer study showed that rainbow trout consumed and to a lesser extent assimilated NZMSs. Rainbow trout fed 15N-labeled NZMSs had muscle isotopic signatures that were 80% higher than those of fish fed unlabeled NZMSs and 30% lower than those of fish fed 15N-labeled amphipods. The feeding study showed that rainbow trout fed an exclusive and unlimited amount of NZMSs lost 0.14–0.48% of their initial body weight per day. Collection of rainbow trout feces showed that 8.5% of the NZMS shells were empty, and these snails were assumed to have been digested; 53.8% of NZMSs passed through the digestive system alive...
Keywords
  • rainbow trout,
  • mud snails
Disciplines
Publication Date
2008
Citation Information
Vinson, M.R. and M.A. Baker. 2008. Poor growth of rainbow trout (Oncorhynus mykiss) fed New Zealand mud snails (Potamopyrgus antipodarum). North American Journal of Fisheries Management 28:701-709.