Evaluation of management factors affecting the relative success of a brook trout eradication program using YY male fish and electrofishing suppression
- 1 August 2021
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Fisheries and Aquatic Sciences
- Vol. 78 (8), 1109-1119
- https://doi.org/10.1139/cjfas-2020-0433
Abstract
Removal of non-native fish populations can be crucial to the conservation of native species, but often presents a complex challenge for managers. The goal of Trojan Y chromosome (TYC) programs is to skew the non-native sex ratio until only males remain, leading to eradication. We present results from a simulation model used to explore effects of alternative management approaches on an in-progress mechanical removal and TYC program to eradicate non-native brook trout (Salvelinus fontinalis). Simulation results indicated that stocking fingerling YY males (similar to 137 mm) was more effective than stocking catchable-sized YY males (similar to 230 mm), although questions about intercohort competition warrant further investigation. Increasing the proportion of mature fingerling YY males reduced treatment time by increasing the number of YY male spawners and increasing density-dependent mortality on young, mature wild brook trout. Maximizing the spatial distribution of YY male releases may be crucial to program success but is also dependent upon immediate dispersal movements. Principles derived from our results can be broadly applied to the management of other aquatic invaded systems using TYC programs to eradicate non-native species.This publication has 53 references indexed in Scilit:
- Modes of Competition: Adding and Removing Brown Trout in the Wild to Understand the Mechanisms of Density-DependencePLOS ONE, 2013
- The spatial scale of competition from recruits on an older cohort in Atlantic salmonOecologia, 2011
- Survival and Dispersal of Hatchery Triploid Rainbow Trout in an Idaho RiverNorth American Journal of Fisheries Management, 2009
- Evidence of density- and size-dependent mortality in hatchery-reared juvenile white sturgeon (Acipenser transmontanus) in the Kootenai RiverCanadian Journal of Fisheries and Aquatic Sciences, 2009
- When Eradication is not an Option: Modeling Strategies for Electrofishing Suppression of Nonnative Brook Trout to Foster Persistence of Sympatric Native Cutthroat Trout in Small StreamsNorth American Journal of Fisheries Management, 2008
- Evaluation of an Unsuccessful Brook Trout Electrofishing Removal Project in a Small Rocky Mountain StreamNorth American Journal of Fisheries Management, 2006
- A model describing the effect of sex-reversed YY fish in an established wild population: The use of a Trojan Y chromosome to cause extinction of an introduced exotic speciesJournal of Theoretical Biology, 2006
- Spatial Distribution of Native and Nonnative Salmonids in Streams of the Eastern Slopes of the Canadian Rocky MountainsTransactions of the American Fisheries Society, 2001
- Electrofishing Mark–Recapture and Depletion Methodologies Evoke Behavioral and Physiological Changes in Cutthroat TroutTransactions of the American Fisheries Society, 1989
- Movements of Hatchery-reared Rainbow, Brook, and Brown Trout Stocked in a Virginia Mountain StreamThe Progressive Fish-Culturist, 1982