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Rabbi Presworsky's book describing the various kosher/non-kosher creatures seen here says that piranha and barracuda are kosher fish based on their scales.
Are there any earlier poskim who have confirmed piranha and/or barracuda are kosher fish?
Although there doesn't seem to be much written online about the kashrus of piranha, Chabad and the Vaad HaKashrus of Ottowa both say baraccuda are kosher. The "Traveling Rabbi" appears to say some piranha are kosher and others aren't.