What's a grunion anyway? And how do fish run? Find out! Cabrillo Marine Aquarium is pleased to welcome you at one of their "Meet the Grunion" evening programs which run March thru July of each year. You and your guests will enjoy the experience of learning and observing the nighttime rituals of this curious little silver fish. Cabrillo Marine Aquarium offers two programs a month beginning in March and ending in July. Cabrillo Marine Aquarium is a trusted resource that inspires exploration, respect and conservation of Southern California marine life.