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Relating fish distributions to physical characteristics of a tidal energy candidate site in the banks strait, Australia

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Scherelis, C, Penesis, I ORCID: 0000-0003-4570-6034, Marsh, P ORCID: 0000-0003-1515-3117, Cossu, R, Hemer, M and Wright, J ORCID: 0000-0002-1085-4582 2020 , 'Relating fish distributions to physical characteristics of a tidal energy candidate site in the banks strait, Australia' , International Marine Energy Journal, vol. 3, no. 2 , pp. 111-118 , doi: 10.36688/imej.3.111‐118.

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Abstract

With the tidal energy industry moving towards commercial-scale developments, it is important to consider potential interactions between tidal energy converters (TECs) and the marine environment prior to the instalment of large-scale TEC arrays. The Banks Strait, a tidal channel located in the northeast of Tasmania, Australia, was identified as a promising candidate site for tidal energy by the Australian Tidal Energy (AUSTEn) project. To gain an understanding about potential overlap between TEC arrays and fish usage of the Banks Strait tidal channel, fish density distributions were estimated from hydroacoustic surveys during the tidal resource characterization campaign. Differences in fish density were examined according to bottom-depth, bottom - type, current speed, temperature and vertical distribution. Fish densities were significantly higher at night and displayed preferences for depths between 20 - 40 m and current speeds between 1.75 - 2 m/s. Fish density was generally highest in the bottom 10 m from the sea floor at all depths sampled. Variation by temperature and bottom-type sampled was not significant. Future studies involving long-term, stationary surveys of fish densities along with repeated surveys across different seasons would provide a more wholistic picture of fish distributions in the Banks Strait to inform developers about potential device encounter probabilities.

Item Type: Article
Authors/Creators:Scherelis, C and Penesis, I and Marsh, P and Cossu, R and Hemer, M and Wright, J
Keywords: Australian tidal energy, Banks Strait, environmental monitoring, fish density distribution, hydroacoustics
Journal or Publication Title: International Marine Energy Journal
Publisher: European Wave and Tidal Energy Conference
ISSN: 2631-5548
DOI / ID Number: 10.36688/imej.3.111‐118
Copyright Information:

This is an open access article distributed under the terms of theCreative Commons Attribution 4.0 licence. CC BY https://creativecommons.org/licenses/by/4.0/

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