Jameis Winston's Dad -- HE'S GOING PRO

Seems seafood counters at grocery stores across Tallahassee can rest easy ... because Jameis Winston is leaving FSU and entering the NFL Draft ... so says his dad.

Winston's father told ESPN ... the 21-year-old has made up his mind -- especially since his son is projected to be a 1st round pick ... which means $$$$$.

As we previously reported, Jameis' off-the-field activity at FSU has been scaring away bigtime sports agents who tell TMZ Sports he seems like too much a headache to sign.