Barracudas aggregate in schools as protection against larger predators.

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Blackfin Barracuda

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Two-banded Anemonefish

Sea anemones are poisonous to most fish. The clownfish however is immune to their stinging tentacles and form a symbiotic relationship with the anemone where the clownfish receive protection from predators, and the anemone benefits from the clownfish' natural activity. For example, the wedging swimming movements from the clownfish stimulate water sirculation around its tentacles, increasing metabolism and growth.