What type of fertilization do animals that live in water usually show?

Animals that live in water typically exhibit external fertilization, where eggs and sperm are released into the water simultaneously. This process allows for a higher chance of fertilization due to the large volume of water, which can dilute and disperse the gametes. Common examples of aquatic animals that use external fertilization include many fish and amphibians. However, some aquatic species, like certain sharks and dolphins, may practice internal fertilization.