(Centrarchidae) and Pygmy Sunfishes (Elassomatidae) in the Netherlands
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A risk analysis of sunfishes (Centrarchidae) and pygmy sunfishes (Elassomatidae) in the Netherlands D.M. Soes S.J. Cooke H.H. van Kleef P.B. Broeckx P. Veenvliet A risk analysis of sunfishes (Centrarchidae) and pygmy sunfishes (Elassomatidae) in the Netherlands D.M. Soes S.J. Cooke H.H. van Kleef P.B. Broeckx P. Veenvliet Commissioned by: Food and Consumer Product Safety Authority 21st of March 2010 Report nr 11-042 Status: final report Report nr.: 11-042 Date of publication: 21st of March 2011 Title: A risk analysis of sunfishes (Centrarchidae) and pygmy sunfishes (Elassomatidae) in the Netherlands Author: ir. D.M. Soes prof. dr. S.J. Cooke dr. H.H. van Kleef ir. P.B. Broeckx P. Veenvliet Number of pages incl. appendices: 110 Project nr: 10-560 Project manager: Ir. D.M. Soes Name & address client: Food and Consumer Product Safety Authority, Invasive Alien Species Team, P.O. Box 9102, 6700 HC, Wageningen Reference client: Order bon nr/contract nr/letter nr/dd mmm 200x Signed for publication: Manager Aquatic ecolgy drs J. Spier Initials: Bureau Waardenburg bv is not liable for any resulting damage, nor for damage which results from applying results of work or other data obtained from Bureau Waardenburg bv; client indemnifies Bureau Waardenburg bv against third- party liability in relation to these applications. © Bureau Waardenburg bv / Food and Consumer Product Safety Authority This report is produced at the request of the client mentioned above and is his property. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, transmitted and/or publicized in any form or by any means, electronic, electrical, chemical, mechanical, optical, photocopying, recording or otherwise, without prior written permission of the client mentioned above and Bureau Waardenburg bv, nor may it without such a permission be used for any other purpose than for which it has been produced. The Quality Management System of Bureau Waardenburg bv has been certified by CERTIKED according to ISO 9001:2000. 2 Preface Several species of Centrarchidae are known to be invasive species of special concern. The Elassomtidae have been mentioned to be an alternative for these species. To gain insight into the occurrence of exotic centrarchid and elassomatid species in the Netherlands, the possibility of them becoming invasive, the possible ecological, economical and social impacts, and the possibilities of risk management the Invasive Allien Species Team of the Food and Consumer Product Safety Authority have commissioned Bureau Waardenburg to carry out a risk analysis. This risk analysis was carried out by Bureau Waardenburg: ir. D.M. Soes (project leader and report) prof. dr. S.J. Cooke (report & review) dr. H.H. van Kleef (report) ir. P.B. Broeckx (report) P. Veenvliet (report) L. Anema (GIS) From the Team of Invasieve Exoten of the Food and Consumer Product Safety Authority the analysis was supervised by Mrs. dr. ir. José H. Vos and ir. J.W. Lammers. We would like to thank the following people for their effort and contribution: J.L. Spier (Bureau Waardenburg), J. Klungers (specialist aquarology of subtropic fish species), S. Fenoglio (Università del Piemonte Orientale, Italy), P. Keith (Muséum national d¹Histoire Naturelle), J. Freyhof (Leibnitz Institute of Freshwater Ecology and Inland Fisheries), G.H. Copp (CEFAS), R. Gozlan (Bournemouth University), E. Tricarico (Università degli Studi di Firenze), E. Kruidenier (Naturalis), H. Verreycken (INBO), D. P.J. van Heugten (De Kreeften en Garnalen shop), J. Bohlen (Academy of the Sciences of the Czech Republic), RAVON, Sportvisserij Nederland, Waarneming.nl, A. Ploeg (Dibevo), T. Demol (Service public de Wallonie) & A. Lamboj (Fischartenatlas.de). We acknowledge that much of the material of chapter 5 is from a recent book on centrarchid fish by Cooke & Philipp (2009) with particular reliance on the chapters that focused on natural history accounts (Warren, 2009), winter biology (Suski & Ridgway, 2009) and organismal physiology (Kieffer & Cooke, 2009). We thank the authors for giving permission for using these texts. 3 4 Table of contents Preface.................................................................................................................................................................3 Table of contents.................................................................................................................................................5 Summary .............................................................................................................................................................7 1 Introduction .................................................................................................................................................9 2 Taxonomy and distribution..................................................................................................................... 11 2.1 Centrarchidae ............................................................................................................................ 11 2.2 Elassomatidae........................................................................................................................... 22 3 General ecology....................................................................................................................................... 25 3.1 Centrarchidae ............................................................................................................................. 25 3.2 Elassomatidae............................................................................................................................ 28 4 Chances of entry...................................................................................................................................... 31 4.1 Presence in Dutch pet trade...................................................................................................... 31 4.2 Presence in American trade...................................................................................................... 31 4.3 Aquaria ........................................................................................................................................ 32 4.4 Garden ponds............................................................................................................................. 35 4.5 Angling......................................................................................................................................... 37 4.6 Aquaculture................................................................................................................................. 39 4.7 Entry from neighboring countries.............................................................................................. 40 5 The probability of establishment............................................................................................................. 45 5.1 Centrarchidae ............................................................................................................................. 45 5.2 Elassomatidae............................................................................................................................ 67 6 The probability of spread & endangered areas..................................................................................... 69 7 Impact........................................................................................................................................................ 71 7.1 Ecological impact........................................................................................................................ 71 7.2 Economic and social impact...................................................................................................... 74 7.3 Conclusions impact.................................................................................................................... 75 8 Risk identification conform the Fisk method.......................................................................................... 77 9 Risk Management.................................................................................................................................... 79 9.1 Prevention of entry and spread................................................................................................. 79 9.2 Eradication and physical control methods ............................................................................... 83 10 Conclusions............................................................................................................................................ 87 11 Literature................................................................................................................................................. 89 5 6 Summary The family Centrarchidae includes about 34 species, which all have their native range in North America. In the Netherlands the most ill famous member is Lepomis gibbosus. This in the Netherlands invasive species is the only member of the family with established populations. These populations can be found all over the Netherlands and the species seems to be still expanding. Its negative image is caused by its presence in many isolated water bodies where it has a strong negative impact on the fauna, including rare amphibians such as the common spadefoot (Pelobates fuscus) and the European tree frog (Hyla arborea). Because of this impact a wholesaler has decided stop selling