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   Potamocorbula amurensis (mollusc)     
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         Management Information

    Preventative measures: Strategies to decrease the risks of future introductions involve ballast water management. Ballast water management regulations have been put in place in countries like the USA, Australia and New Zealand. Oxygen deprivation, which has been trialed as a treatment in ballast tanks, is found to be unsuccessful in the case of the Asian clam. It has a high tolerance to low oxygen and is found in polluted or eutrophic areas and hence, low oxygen is unlikely to be successful unless hypoxic conditions can be maintained for a long time (McEnnulty et al., 2001).

    In Australia's National List of Invasive Marine Species, the Asian clam has been classified as one of the species whose incursion can trigger an emergency response. Regulations have been put in place for the management of internationally sourced ballast water, a known vector for the Asian clam (DAFF, 2004). In New Zealand, surveillance systems have been put into place for the early detection of any incursions of P. amurensis, classified as one of 6 exotic high impact species (MAF, 2008).

    Physical: The Asian clam is preyed upon by birds, fish and crabs. However, options for its large-scale control are limited (Department of Fisheries, WA). Dredging, beamtrawling and mopping as control options have been found to be unsuccessful in the case of the Asian clam. Dredging is unlikely to succeed as a control option due to very high densities and the small size of this species. P. amurensis is a comparatively thin, fragile shell more subject to breakage.    



         Management Resources/Links

    1. Centre for Environment, Fisheries & Aquaculture Science (CEFAS)., 2008. Decision support tools-Identifying potentially invasive non-native marine and freshwater species: fish, invertebrates, amphibians.
            Summary: The electronic tool kits made available on the Cefas page for free download are Crown Copyright (2007-2008). As such, these are freeware and may be freely distributed provided this notice is retained. No warranty, expressed or implied, is made and users should satisfy themselves as to the applicability of the results in any given circumstance. Toolkits available include 1) FISK- Freshwater Fish Invasiveness Scoring Kit (English and Spanish language version); 2) MFISK- Marine Fish Invasiveness Scoring Kit; 3) MI-ISK- Marine invertebrate Invasiveness Scoring Kit; 4) FI-ISK- Freshwater Invertebrate Invasiveness Scoring Kit and AmphISK- Amphibian Invasiveness Scoring Kit. These tool kits were developed by Cefas, with new VisualBasic and computational programming by Lorenzo Vilizzi, David Cooper, Andy South and Gordon H. Copp, based on VisualBasic code in the original Weed Risk Assessment (WRA) tool kit of P.C. Pheloung, P.A. Williams & S.R. Halloy (1999).
    The decision support tools are available from: http://cefas.defra.gov.uk/our-science/ecosystems-and-biodiversity/non-native-species/decision-support-tools.aspx [Accessed 13 October 2011]
    The guidance document is available from http://www.cefas.co.uk/media/118009/fisk_guide_v2.pdf [Accessed 13 January 2009].

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ISSG Landcare Research NBII IUCN University of Auckland