Fish motifs in Aboriginal rock art of the Laura area (Cape York Peninsula, Queens-land, Australia) include a heterogenous group that has been imprecisely classified by rock art researchers. By analysing motif attributes, style and contexts (including natural populations), we characterised three categories: fork-tailed catfish (Neoarius paucus), eel-tailed catfish (Neo-silurus spp.) and eel (Anguilla reinhardti). We label the categories with the local names ‘catfish’, ‘jewfish’ and ‘eel’. The catfish cohort has a relatively naturalistic style, while the eel exhibits anatomical trends of eels, distinctive arrangements, and stylistic overlaps with jewfish that may denote shared meanings. Ambiguity is confirmed as a cultural value and communication mode of the rock art system.