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Umikuji are omnivores, and typically eat small fish and crustaceans; they may also feed on any sea plants such as algae and kelp, and have also been known to eat jellyfish and anemones, being immune to the poison those creatures typically carry.
Umikuji lay clutches of seven to eight eggs about an inch and a half in diameter; the eggs are kept in a sort of mucus sac and stored deep within a hole dug in the sea bed by the mother. Both parents will check on the eggs several times per day, taking turns and using their Water manipulation abilities to bring fresh seawater
onto the egg sac.
In some parts of Mobius, the meat of the Umikuji is actually considered a high-priced delicacy; when prepared properly, it is safe to eat, much like how ''fugu'' (the dish prepared from pufferfish) is edible when prepared properly. Also like fugu, Umikuji meat requires specialized chefs to prepare it, and they are required to undergo two to three years worth of extensive training in order to obtain a licence for this. A single, tiny mistake in the preparation process can have disastrous consequences.