The use of tools by fish is rarely studied due to the difficulty of observing behaviour underwater and the misconception that fish are not intelligent. However, studying fish tool use can reveal important insights into fish ecology and their cognitive abilities. Our research focuses on anvil use where a fish uses a rock to crack open prey. This behaviour allows fish to eat prey that would otherwise be inaccessible, expanding their foraging niche. To date, tool use has been observed in 20 wrasse species (Labridae) but these observations are limited to opportunistic sightings of one individual at a single location. We have collected observations through citizen science and fieldwork. These observations have been used to determine what species, which individuals, where and how fish use rocks as cracking tools. So far, we have identified 13 new species all of which cluster in the same clades as previous observations. Comparative analysis between tool-using and not-tool-using clades will be conducted to determine the ecological, physical and cognitive factors that drive tool use evolution. The observations will also provide insights into the development, adaptive function and ecological impact of anvil use in fishes.