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Spatial distribution and seasonal variation in Undaria pinnatifida ...

Spatial distribution and seasonal variation in Undaria pinnatifida ...

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Figure 7: Heavily <strong>in</strong>fested mussel l<strong>in</strong>es, Motukopake Isl<strong>and</strong>, 23/11/12 (A) <strong>and</strong> Wilson Bay,6/12/11 (B).ABLevels of <strong>Undaria</strong> <strong>in</strong>festation were weakly positively related to the size of mussels. Mussel size is a general <strong>in</strong>dicator ofhow long the l<strong>in</strong>es have been <strong>in</strong> the water <strong>and</strong> can vary between <strong>in</strong>dividual l<strong>in</strong>es with<strong>in</strong> the same mussel farm. The highest<strong>Undaria</strong> <strong>in</strong>festation levels were generally seen on mussel l<strong>in</strong>es with mussels larger than 50-60mm (Figure 8), which wouldhave been <strong>in</strong> the water for at least 5-7 months.14

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