Sea urchins, echinoderms in the Class Echinoidea, are commonly used in ecotoxicity assays around the world due to the ease of handling and spawning in the laboratory,and their high sensitivity to pollutants, which makes them good indicator species (US EPA 2002a, ASTM 2012). Pluteus (the urchin larval type) formation has been shown to be more sensitive than fertilisation or gastrula development in many species, thus the early pluteus stage is a common endpoint in toxicity assays (Kobayashi 1980,King & Riddle 2001). Abalone, molluscs in the Class Gastropoda, are less extensively studied but have been shown to be extremely sensitive to pollutants and environmental stressors in general during the larval stage (Hunt & Anderson 1989,Conroy et al. 1996). Declines in abalone populations have been linked to urban and industrial discharges in North America and Australia (Martin et al. 1977, Anderson et al. 1990, Bielmyer et al. 2005, Gorski & Nugegoda 2006). Importantly, urchins and abalone are common and ecologically important members of subtidal reef communities that are likely to be impacted by coastal runoff (Andrew 1988, Morrison et al. 2009).