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Incursion of the urchin Centrostephanus rodgersii into Tasmania, Australia, and its\udestablishment at high densities raises questions about its potential interactions with another large\udherbivore on subtidal rocky reefs, the commercially fished abalone Haliotis rubra. Surveys on the\udsoutheast coast of Australia show a negative relationship between densities of C. rodgersii and H.\udrubra at several spatial scales, suggesting negative interactions. In intact algal beds, we used enclosures\udto estimate the effects and relative magnitude of intra- and interspecific competition on the\udbody condition, gonad development and survival of C. rodgersii and H. rubra. An increased density\udof conspecifics led to declines in the dry gonad weight of C. rodgersii and in the dry foot and stomach\udcontent weights of H. rubra. The effects of interspecific competition were asymmetrical. Manipulations\udof H. rubra densities had no detectable effect on C. rodgersii. In contrast, in enclosures with\udadded C. rodgersii, H. rubra showed reduced total and dry weights of stomach contents and\udincreased mortality relative to controls without urchins. The effects of C. rodgersii on H. rubra could\udbe linked to differences in feeding habits and morphology. C. rodgersii is a generalist herbivore,\udwhich, even at low densities, reduced the cover and standing biomass of total, brown and red algae\udrelative to controls without urchins. In contrast, H. rubra is a specialist herbivore, which, even at high\uddensities, had little effect on the cover and standing biomass of algae relative to the effect of\udC. rodgersii. This study suggests that the invader C. rodgersii is the superior competitor in interactions\udwith H. rubra, and that its presence, even at low densities, affects the abalone fishery

Competition between an invasive urchin and commercially fished abalone: effect on body condition, reproduction and survivorship