Instream Barrier Assessment and Prioritisation of the Lower Barwon River and Otways Streams A report for the Corangamite Catchment Management Authority Environous, Kingfisher Research and Arthur Rylah Institute for Environmental Research (DSE) Published by: Environous PO Box 86, Queenscliff, Victoria, 3225 Telephone: (03) 5258 1831 Email:
[email protected] Also: Kingfisher Research 20 Chapman Street, Diamond Creek, Victoria 3089 And: Arthur Rylah Institute for Environmental Research Department of Sustainability and Environment PO Box 137, Heidelberg, Victoria, 3084 Produced for: Corangamite Catchment Management Authority 64 Denis Street, Colac, Victoria, 3250 This publication may be cited as: Ryan, T., Stuart, I., O’Brien, T. and Saddlier, S, (2010) Instream Barrier Assessment and Prioritisation of the Lower Barwon River and Otways Streams. Report for the Corangamite Catchment Management Authority. Cover photographs: from top left to right: tidal barrage weir and fishway on Thompson Creek @ Minya; diversion weir on Erskine River below Erskine Falls; culvert fishway on lower Cumberland River; gauging weir on Lardners Creek gauging @ Gellibrand East Road. This document was produced by environous Pty Ltd. for the Corangamite CMA and may only be used for the purposes and in accordance with the Terms of the Engagement for which it was commissioned. Instream Barrier Assessment and Prioritisation of the Lower Barwon River and Otways Streams EXECUTIVE SUMMARY At least 10 of the 16 freshwater fish species found in the Corangamite Catchment need to migrate between freshwater and estuarine or marine habitat as an obligatory part of their life cycle. The other five freshwater fish species also benefit from unrestricted movement to access a variety of habitats including appropriate breeding, nursery and feeding habitats.