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Development of a method to reduce the spread of the ascidian Didemnum vexillum with aquaculture transfers
Denny, C.M. (2008). Development of a method to reduce the spread of the ascidian Didemnum vexillum with aquaculture transfers. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 65(5): 805-810. https://dx.doi.org/10.1093/icesjms/fsn039
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289
|   |
| Trefwoorden |
Acetic acid
Aquaculture
Water > Fresh water
Didemnum vexillum Kott, 2002 [WoRMS]; Perna canaliculus (Gmelin, 1791) [WoRMS]
|
| Author keywords |
bleach; vector management |
| Abstract |
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 Greenshell™ 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. |
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