Baikalsponge Video: An example of an active suspension feeder, a sponge (Baikalospongia bacillifera) from the world’s oldest, deepest, most voluminous lake, Lake Baikal, Russia. Note how the dye is pumped at high rate from the excurrent pores, the oscula. Later in the clip, an flowmeter with underwater computer is shown measuring the pumping rate of one of these sponges. On a typical coral reef (and in Lake Baikal too), there are so many sponges in the shallows that the overlying water column is pumped through sponges every 24-48 hours!
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