A friend of mine developed paralysis and took years to recover enough to go back to work. He's still not 100%. That said, he didn't eat the barracuda in Belize; he ate it on Little Corn Island, Nicaragua.
Recently, whilst in San Pedro, I had a couple of local guides tell me that they know by the smell and/or texture, whether or not the barracuda is alright to eat.
Be that as it may, you'll not find me eating any barracuda.