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Restoration of a New Zealand Lagoon: Evaluation of Two Years of Introduced Fish Control Trials

Restoration of a New Zealand Lagoon: Evaluation of Two Years of Introduced Fish Control Trials <p>ABSTRACT:</p><p>Increased interest from waterway stakeholders and managers in controlling introduced fishes in selected situations, together with limited knowledge regarding effective means of doing so, makes the reporting of control projects in various environments important. This study reports the results of control trials on an introduced fish assemblage (<i>Salmo trutta</i> [brown trout], <i>Perca fluviatilus</i> [Eurasian perch], and <i>Scardinius erythropthalmus</i> [common rudd]) in a small lagoon in the lower North Island. The trials indicated that repeated netting was an effective means of suppressing introduced fish biomass and could potentially result in eradication if the lagoon was closed off to immigration from the adjacent lake. Increases in native fish density and diversity during the control trials indicated that the reduction in introduced fish biomass could have alleviated predation pressure on these species. In addition perch, and to a lesser degree rudd, completed regular spawning migrations into the lagoon from the lake during spring, providing opportunities for strategic control in the future.</p> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecological Restoration University of Wisconsin Press

Restoration of a New Zealand Lagoon: Evaluation of Two Years of Introduced Fish Control Trials

Ecological Restoration , Volume 37 (2) – May 28, 2019

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Publisher
University of Wisconsin Press
ISSN
1543-4079

Abstract

<p>ABSTRACT:</p><p>Increased interest from waterway stakeholders and managers in controlling introduced fishes in selected situations, together with limited knowledge regarding effective means of doing so, makes the reporting of control projects in various environments important. This study reports the results of control trials on an introduced fish assemblage (<i>Salmo trutta</i> [brown trout], <i>Perca fluviatilus</i> [Eurasian perch], and <i>Scardinius erythropthalmus</i> [common rudd]) in a small lagoon in the lower North Island. The trials indicated that repeated netting was an effective means of suppressing introduced fish biomass and could potentially result in eradication if the lagoon was closed off to immigration from the adjacent lake. Increases in native fish density and diversity during the control trials indicated that the reduction in introduced fish biomass could have alleviated predation pressure on these species. In addition perch, and to a lesser degree rudd, completed regular spawning migrations into the lagoon from the lake during spring, providing opportunities for strategic control in the future.</p>

Journal

Ecological RestorationUniversity of Wisconsin Press

Published: May 28, 2019

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