The researchers studied how different types of fish behave and where they are located on a rocky intertidal platform in Portugal during high tide. They found that certain fish species prefer specific areas on the platform, with some moving to higher levels as the tide rises. Some fish that are usually found in deeper waters were also seen in the intertidal zone during high tide. The researchers observed that the intertidal area serves as a nursery for young fish from various species. Overall, the study shows that fish behavior and distribution change with the tide, and the rocky intertidal platform plays an important role in supporting a diverse fish community.