Your question is too broad to answer as there are many species of jellyfish. For instance on the island of Palau where the jellyfish in one lake actually do not eat (catch food) at all. Please ask you question again specifying which species of jellyfish you are wanting to know about.
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Jellyfish are consumers because they consume material in order to survive - they do not produce their own energy. Plants are producers because they use photosynthesis to get energy.