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In 2010, the colonial ascidian Didemnum perlucidum (Monniot, 1983) was first recorded in Western Australia and is now widespread across the state. This species is classified as a target biosecurity species by the Department of Fisheries, Government of Western Australia. However, limited information on the biology of this ascidian is available for Australian waters. The aim of this study was to gather baseline information on the temporal variation in growth, survival, and reproduction of D. perlucidum. The mean average colony area was significantly higher in summer (29.7 cm ) decreasing towards winter (3.3 cm ). Colonies produced larvae year round with maximum production (1109.0 larvae cm 2 ) and highest recruitment (0.90 settlers cm 2 ) in summer. Larva density was positively correlated to salinity (r = 0.965) and chlorophyll a concentration (r = 0.958) in the water column. From a management point of view, the decrease in colony size, larvae production, and recruitment of D. perlucidum during winter could offer the best opportunity for the control or eradication of this ascidian at specific locations in the state.

Aspects of the growth and reproductive ecology of the introduced ascidian Didemnum perlucidum (Monniot, 1983) in Western Australia