Modifiers matching plankton:

• animal,
• larger,
• gelatinous,
• motile,
• bioluminescent,
• marine,
• small,
• net,
• crustacean,
• abundant,
• oceanic,
• floating,
• microscopic,
• large,
• unicellular,
• pelagic,

Simple categories matching gelatinous:

• zooplankton,
• predator,
• invertebrate,
• animal,
• organism,
• prey,
• plankton,
• creature,