If in a food chain bigger fish eats smaller fish. What is the called?

The term for a food chain in which bigger fish eats smaller fish is "predation". Predation is a biological interaction where a predator (the bigger fish) captures and feeds on a prey (the smaller fish). It is a fundamental ecological process that shapes the structure and dynamics of ecosystems, influencing the population sizes, behaviours, and adaptations of both predators and prey.