Impacts of fishing, river flow and connectivity loss on the conservation of a migratory fish population

Lin, Hsien-Yung, Brown, Christopher J., Dwyer, Ross G., Harding, Doug J., Roberts, David T., Fuller, Richard A., Linke, Simon and Possingham, Hugh P. (2017) Impacts of fishing, river flow and connectivity loss on the conservation of a migratory fish population. Aquatic Conservation: Marine and Freshwater Ecosystems, . doi:10.1002/aqc.2831

Author Lin, Hsien-Yung
Brown, Christopher J.
Dwyer, Ross G.
Harding, Doug J.
Roberts, David T.
Fuller, Richard A.
Linke, Simon
Possingham, Hugh P.
Title Impacts of fishing, river flow and connectivity loss on the conservation of a migratory fish population
Journal name Aquatic Conservation: Marine and Freshwater Ecosystems   Check publisher's open access policy
ISSN 1099-0755
Publication date 2017-10-12
Year available 2017
Sub-type Article (original research)
DOI 10.1002/aqc.2831
Open Access Status Not yet assessed
Total pages 10
Place of publication Chichester, West Sussex United Kingdom
Publisher John Wiley and Sons
Language eng
Subject 1104 Aquatic Science
2303 Ecology
2309 Nature and Landscape Conservation
Abstract Migratory species depend on connected habitats and appropriate migratory cues to complete their life cycles. Diadromous fish exemplify species with migratory life cycles by moving between connected freshwater and saltwater habitats to reproduce. However, migration increases the exposure of fish to multiple threats and it is critical that managers integrate habitat connectivity into resource management and conservation. The benefit of alternative management actions was assessed for a diadromous fish, the Australian bass Percalates novemaculeata, using a spatio-temporal population model informed by individual-based movement data. The management actions comprise seasonal closures during the spawning season, and controlling fishing pressure by limiting catch or effort. The benefits of implementing seasonal closures depend upon interactions among how fishing pressure is controlled, the response of anglers to fishery regulations and river flow regimes. The results indicated that seasonal closures are ineffective if fishing pressure is merely displaced to another location or time of year. In addition, shifting seasonal closures from spawning grounds to feeding grounds increased population abundances under low flow events when fishing effort was also controlled. However, when total annual catch is limited by a fishery closure, changing the location of seasonal closure schemes had little effect. The findings in this study highlight the need for flexible management strategies that account for migratory movements and respond both to variations in connectivity (e.g. river flow regime) and direct pressures on survivorship (e.g. exploitation). As the implementation of one management action (e.g. fishing or water regulation) could affect the influence of another management action, this study emphasizes the importance of cooperation between resource managers in conserving migratory species.
Keyword Acoustic telemetry
Animal movement
Fishing regulation
Human behaviour
Water management
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Sun, 17 Dec 2017, 00:25:55 EST