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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 8, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(5):805-810; doi:10.1093/icesjms/fsn039
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Development of a method to reduce the spread of the ascidian Didemnum vexillum with aquaculture transfers

C. M. Denny

Cawthron Institute, 98 Halifax Street East, Private Bag 2, Nelson, New Zealand

tel: +64 3 548 2319; fax:+64 3 546 9464; e-mail: chrisdenny{at}hotmail.com

Denny, C. M. 2008. Development of a method to reduce the spread of the ascidian Didemnum vexillum with aquaculture transfers. – ICES Journal of marine Science, 65: 805–810.

The colonial ascidian Didemnum vexillum was discovered in Shakespeare Bay (New Zealand) in 2001 and now poses a serious threat to the aquaculture industry. I assess several techniques to eliminate Didemnum from GreenshellTM seed-mussels (Perna canaliculus) in order to reduce the spread of the pest species with aquaculture transfers. Simple approaches based on fresh-water immersion proved ineffective or impractical in controlling Didemnum, so different chemical treatments were evaluated. Initial trials were conducted using acetic acid at concentrations ranging from 0.1 to 10% for a range of exposure times. However, at concentrations or exposure times tolerated by seed-mussels, Didemnum colonies survived with, on average, ~80% mortality. These results led to the testing of other chemicals, and sodium hypochlorite (bleach) was identified as a potential candidate. It was determined that dipping Didemnum in a 0.5% solution of bleach for 2 min was a 100% effective method of treatment that also left seed-mussels relatively unaffected.

Keywords: acetic acid, aquaculture, bleach, Didemnum vexillum, fresh water, Perna canaliculus, vector management

Received 18 May 2007; accepted 29 January 2008; advance access publication 8 April 2008.


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