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Updated: August 5, 2026
For a discussion of this subject, see P. van Beneden, Commensaux et Parasites, Paris, 1875. The Fierasfer, a little fish of the Mediterranean, installs himself in the respiratory cavity of a Holothurian; he does not live at the expense of his host's flesh, but contents himself with levying a tax on the foods which enter the cavity.
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