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Feeding Behavior
Filter Feeding
Straining plankton, small crustaceans, and detritus from massive volumes of water using gill rakers and modified mouthparts.
Trigger: Food Function: Efficient harvest of dispersed plankton and organic matter
📖 Overview
The largest fish on Earth - whale sharks, basking sharks, manta rays, megamouth sharks - are all filter feeders. Bypassing higher trophic levels and feeding directly on plankton is astonishingly efficient - it lets these giants reach 12+ metres and thousands of kilograms on a diet of microscopic prey. Smaller filter feeders like menhaden, anchovies, and paddlefish are the ecological linchpins between plankton and predators.
⚙️ How It Works
Ram filtration (swimming with mouth open - whale shark, basking shark). Suction filtration (gulping and expelling water through gill rakers - anchovies). Buccal pumping (pumping water without swimming - some rays).
🐟 Examples Across Species
Whale shark, basking shark, megamouth shark, manta ray, paddlefish, menhaden, anchovies, silver carp, gizzard shad.
✨ Fun Fact
A whale shark can filter 1,500 gallons of water per hour - the volume of a hot tub every hour. Its gill rakers are so fine they can retain organisms less than a millimeter across.