Yes you can

Smaller species can be used as fish bait; jellyfish become food after salting, and some species can be used for medicinal purposes

Jellyfish (English name: Jelly Fish): is an important plankton in the aquatic environment, and belongs to the order of jellyfish in the mantle of the Stinging Cyclopoidea. Jellyfish is a very beautiful aquatic animal. Its body shape is like a transparent umbrella, the umbrella diameter of large and small, large jellyfish umbrella diameter of up to 2 meters. The edge of the umbrella body has some whisker-like tentacles, some tentacles can be as long as 20-30 meters.

Source: Jellyfish (cnidarians) _ Baidu Encyclopedia