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Redfin Perch in Lake Purrumbete – Managing the Fishery Recreational Fishing Grants Program Research Report

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Redfin Perch in Lake Purrumbete – Managing the Fishery Recreational Fishing Grants Program Research Report Redfin perch in Lake Purrumbete – managing the fishery Recreational Fishing Grants Program Research Report Redfin perch in Lake Purrumbete – managing the fishery June 2018 Recreational Fishing Grants Program Research Report Published by the Victorian Government, Victorian Fisheries Authority (VFA), June 2018 © The State of Victoria, Victorian Fisheries Authority, Melbourne, June 2018 This publication is copyright. No part may be reproduced by any process except in accordance with the provisions of the Copyright Act 1968. Authorised by the Victorian Government, 1 Spring Street, Melbourne. Preferred way to cite this publication: VFA (2017) Redfin perch in Lake Purrumbete – managing the fishery. Recreation Fishing Grants Program Research Report. ISBN 978-1-925733-43-3 (Print) ISBN 978-1-925733-44-0 (pdf/online) Copies are available by emailing [email protected] For more information contact the VFA Customer Service Centre 136 186 Disclaimer This publication may be of assistance to you but the State of Victoria and its employees do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on any information in this publication. Accessibility If you would like to receive this publication in an accessible format, such as large print or audio, please telephone 136 186, or email [email protected] Deaf, hearing impaired or speech impaired? Call us via the National Relay Service on 133 677 or visit www.relayservice.com.au Managing redfin perch in Lake Purrumbete – Modelling impacts of fish reduction • Recreational Fishing Grants Program ii Contents Executive summary ____________________________________________________________________ 4 Introduction ___________________________________________________________________________ 5 Methods ______________________________________________________________________________ 7 Virtual population simulation model 7 Cost-benefit, regulatory and logistics analyses 9 Results ______________________________________________________________________________ 11 Simulation modelling 11 Cost-benefit, regulatory and logistics analyses 13 Discussion ___________________________________________________________________________ 17 Simulation modelling 17 Cost-benefit, regulatory and logistics analyses 18 Conclusions and recommendations ______________________________________________________ 19 Acknowledgements ___________________________________________________________________ 20 References __________________________________________________________________________ 21 Appendix I. Draft journal manuscript ____________________________________________________ 24 Managing redfin perch in Lake Purrumbete – Modelling impacts of fish reduction • Recreational Fishing Grants Program iii Executive summary Lake Purrumbete has long sustained and continues to support a well-known and very popular salmonid fishery with trophy Chinook salmon, brown trout and rainbow trout often caught. The most abundant angling species in the lake is redfin perch (Perca fluviatilis) and there are differing views amongst anglers regarding redfin perch in this mixed species fishery. While some anglers like to fish for redfin perch in the lake, and good catches of large fish have occurred recently, the species can be unpopular with other anglers due to large catches of small fish that have little sporting value and are too small to fillet. In 2016 the Lake Purrumbete Angling Club (LPAC) believe that there was an opportunity to improve the recreational fishery of the lake by investigating the active management of the redfin perch population in the lake. It was agreed at a recreational fishing stakeholder meeting that before a redfin perch management plan can be implemented for Lake Purrumbete, population simulation (modelling) and cost-benefit analyses should be undertaken to determine the effort and costs required to achieve the desired impact on the redfin perch population. The LPAC, with funding support from the Recreational Fishing Licence Working Grants Group, commissioned this study to determine the feasibility of instigating a redfin perch management plan for Lake Purrumbete by: (a) Using a population simulator (model) to estimate the effects of reducing the redfin perch population using a range of strategies. (b) Estimating the costs, logistics and resource requirements for reducing redfin perch population. Simulation modelling of the Lake Purrumbete redfin perch population suggested that a noticeable change in population abundance and structure can only be achieved by intensive harvesting (>50% of population) of small fish (<150 mm) annually. Harvesting lower proportions of the population less frequently had little effect on the population, while harvesting large fish (>150 mm) actually increased the abundance of less desirable small fish. These results were attributed to the life-history characteristics of redfin perch, such as the ability to respond rapidly to changes in environmental conditions and population structure. Modelling suggested that a noticeable change in population abundance and structure can only be achieved by intensive harvesting of small fish annually. This would require a substantial cost in the order of $30,000 per year to noticeably reduce the size of the redfin perch population in Lake Purrumbete. The number of redfin perch that can be harvested by the preferred method could not be assessed due to lack of information on the standing stock of redfin perch in Lake Purrumbete and fishing efficiency (catch per effort). VFA Management Response Victorian Fisheries Authority (VFA) Management and Lake Purrumbete Angling Club (LPAC) Committee have met, reviewed this report and conclude that active harvest of redfin in Lake Purrumbete is not supported nor practicable based on the available information. The report states that significant effort and costs would be required to noticeably reduce the size of the redfin population, and uncertainties exist regarding whether the actions modelled would be effective. Redfin are among the most popular freshwater fish in Victoria and a great food and sport fish, especially for kids and families to experience fishing. The VFA and LPAC will continue to work together to improve fishing at Lake Purrumbete through monitoring and close engagement on the performance of the fishery, fish stocking trials and access improvements. Managing redfin perch in Lake Purrumbete – Modelling impacts of fish reduction • Recreational Fishing Grants Program 4 Introduction Lake Purrumbete (Figure 1) has long supported a well-known and very popular salmonid fishery with trophy fish often being taken (Tunbridge et al. 1991, Fisheries Victoria 1997, Department of Primary Industries 2008). The lake is regularly stocked with hatchery-bred rainbow trout (Oncorhynchus mykiss), brown trout (Salmo trutta) and Chinook salmon (Oncorhynchus tshawytscha) by the Victorian Government to sustain popular and productive put-grow-and-take recreational fisheries (Barnham 1997, Department of Primary Industries 2008, Hunt et al. 2014). Over the last decade between 25,000 and 50,000 salmonids have been stocked annually into the lake (Hunt et al. 2017). A recent assessment of lake’s salmonid fishery (Ingram et al. 2017) showed that: • Reintroduction of Chinook salmon has been highly successful with increasingly larger fish being taken by anglers and that catch rates are consistent with long term trends. • Trophy size brown trout (4.5 kg+) and well-conditioned rainbow trout (2 kg+) are regularly being caught. Despite this, the most abundant angling species in Lake Purrumbete is redfin perch (Perca fluviatilis) (Ingram 2016, Ingram et al. 2017), and recent social media reports suggest there have also been good catches of large fish over the last 12 months. However, there are differing views amongst anglers regarding the value of redfin perch in Lake Purrumbete. Redfin are extremely popular and targeted by recreational species in inland waters of Victoria (Australian Survey Research 2012). While some anglers like to fish for redfin perch in Lake Purrumbete, frequent catches of small fish from the lake that have little sporting value and are too small to fillet, has made the species less popular with other anglers. Further, the large numbers of redfin perch may also be negatively impacting on salmonid populations by both competing for food and preying on juveniles (Ingram 2016, Ingram et al. 2017). In Victoria, anglers are encouraged not to return redfin back to the water as they are a voracious predator that prey on native fish species and other aquatic organisms (https://vfa.vic.gov.au/recreational-fishing/). The Lake Purrumbete Angling Club (LPAC), established in 1928, has had a long history of advocating for improving the lake and its fishery, and has been a strong supporter of a science-based approach to management having either commissioned or supported a number of studies (e.g. Hunt et al. 2012, Hunt et al. 2014, Ingram 2016, Ingram et al. 2017). Since the proliferation of redfin perch in the lake in the early 1980s, the club has regularly expressed concerns about the impact this spread has had on the salmonid fishery. Consequently, there have several attempts by fisheries authorities to control their numbers. Two mitigation efforts have been attempted. 1) 1985 - using the floating Merwin Trap-net which proved unsuccessful, and 2) 1993
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