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Hawaiian monk seal Visitors to our Aquarium may notice that our monk seal pool is green due to the breakdown of our ozone machine that keeps the pool water clear. While the water is green from microscopic algae, please be assured that the health and well being of our resident monk seals has not been compromised. The green coloration on the monk seals is natural algae growth that is not related to the color of the water. Our Live Exhibits staff is working with a reputable company to install a new water quality system for which we’re currently awaiting shipment of the equipment. We hope to have this in place soon and apologize for any inconvenience.
The Hawaiian monk seal and visitors to Hawaii have something in common. Both are active in the morning and evening, but the rest of the day may be spent lounging on Hawaii’s beaches. For the Hawaiian monk seal, this activity pattern may be an important adaptation for survival, allowing them to conserve energy between hunting and foraging trips.
This endangered seal is found only in the Hawaiian Islands. Its primary habitat lies in the Northwestern Hawaiian Islands – a chain of uninhabited islands extending over 1,200 miles (2,000 km) northwest from Kauai to Midway Island and Kure atoll.
The Hawaiian monk seal is one of the most critically endangered seal species in the world. Intense conservation efforts by the National Marine Fisheries Service have helped to stabilize the population, but even so, it continues to decline and only about 1,200 animals remain.
Hawaiian monk seals have been known to dive to depths of 500 meters (1,667 feet) or more, but most of their diving is probably much shallower. When hunting, they may stay underwater for up to 20 minutes or more. They have a varied diet that includes octopus, lobster, and reef fish (including eels).
Monk seals are not highly social animals and spend much of their time alone or spread apart on available beaches. They may live up to 30 years and reach lengths of 8 feet (2.4 m). Weights range from 400-600 pounds (182-273 kg). Most pups are born around April and May and weigh up to 35 pounds (16 kg).
Tiger sharks and Galapagos sharks are the main predators of Hawaiian monk seals. In recent years, deaths have also been attributed to entanglement in marine debris.
The Waikīkī Aquarium houses two male Hawaiian monk seals, Maka onaona and Ho‘ailona. Both of these seals were rescued as pups and have spent most of their life at Waikīkī Aquarium. Neither would be able to survive in the wild, instead they serve as ambassadors for their critically endangered species.