Incidence of a pea crab and a trematode in cultivated and natural green‐lipped mussels

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Abstract
The incidence of infection of green‐lipped mussels Perna canaliculus with the pea crab Pinnotheres novaezelandiae and the trematode Cercaria haswelli was recorded from seven sites around New Zealand from Ahipara to Marlborough Sounds. Infection rates in 4314 raft‐grown and 2642 natural shore‐grown mussels were low, ranging from 0.2% to 3.6% for the seven populations. The condition of the mussels was not significantly affected by the infections. In both natural and cultivated mussel populations, mortality caused by these associate organisms will probably be minimal.