Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences

Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.

Optimizing fishery characteristics through control of an invasive species: strategies for redfin perch control in Lake Purrumbete, Australia.

Daniel Gwinn , Brett Ingram

Abstract

Invasive fish species can present difficult management problems, particularly when the species has recreational value. One such case is redfin perch in Lake Purrumbete, Australia, which have recreational value, but have become invasive in the lake. Here we evaluate removal strategies of redfin perch in Lake Purrumbete with the aim to improve the quality of the recreational fishery. We evaluate removal scenarios for redfin perch with a population model and conducted a sensitivity analysis to determine the robustness of our general results. Our results suggest that removal scenarios that directs exploitation at fish ≤ 150-mm total length with high levels of exploitation, annually will result in the greatest reduction in small undesirable fish and the greatest increase in large desirable fish in the lake. This result was consistent across most assumptions about life-history characteristics, density-dependent processes, and population dynamics rates, suggesting that this management strategy is robust to most relevant biological uncertainties. Furthermore, exploiting redfin perch on an annual time scale will result in the lowest annual variation in the population due to disruption of the age and size structure. These results can help managers choose strategies to manipulate the fishery of Lake Purrumbete to achieve more desirable characteristics.

MF17326  Accepted 29 January 2018

© CSIRO 2018