This study (Nature Ecology & Evolution, Johansen et al., 2017) used larval fishes like this. Image by Jacob Johansen.

Study Finds Low Oil Concentrations Impair Self-Preservation Behaviors in Coral Reef Fish Larvae

Researchers from the United States, Australia, and Europe conducted mesocosm experiments to assess how larval reef fishes respond physiologically and cognitively to low crude oil concentrations. The team observed that polycyclic aromatic hydrocarbons (PAHs), at levels recorded in industrialized sections of tropical coral reefs worldwide, increased larvae mortality and stunted growth rates.