I'd call it a Winter Blackmouth also. The straits put out fish like that allot. They move through our area chasing bait. Big fish are regular acourding to my Father in Law. I have got a few in the low to mid teens last year in December. Last year around Christmas we didn't keep a fish less than 10#. Nobody has been able to fish Manchester in December and January for a few years but back in the day they (old timers) say there were lots of big fish this time of year.