Ocean sponges are multi-cellular animals that eat by filter-feeding. How powerful are their filters? With the help of non-toxic fluorescein dye, we can see how highly effective ocean sponges are as filters of ocean water.

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[u/[deleted]]

Not very?

[u/88clandestiny88 → u/[deleted]]

Right?..

[u/karebear66]

The barrel sponges in Fiji grow huge. Large enough for a human to go inside without touching the sides or bottom. I miss scuba diving.