In captivity, jellyfish typically live longer, with lifespans of 1–3 years when kept in proper conditions!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Orcas can survive in both shallow water near coastlines and in deep ocean waters over 1,000 feet (305 meters) deep!
Dolphins can learn to “walk” backwards on their tail in the water!
Most nudibranchs have two pairs of tentacles up front: one pair (rhinophores) to ‘smell’ the water, and another pair (oral tentacles) by the mouth to feel and taste what’s around them!
Some cone snails can inject poison in less than 50 milliseconds — faster than you can blink!