Assertion: flathead catfish | /r/CapableOf | thrive about 5 ppt.[full citation
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text: The flathead catfish cannot live in full-strength seawater (which is about 35 parts per thousand or about 35 grams of salt per liter of water), but it can survive in 10 ppt for a while and thrive in up to about 5 ppt.[full citation needed]