Winter Fishing?

Have not done much sea fishing (none this year), and all to date has been during the summer months. At this time of year what would be the best plan of action and what species should I be targetting?
Will be fishing the Galway/Mayo region, beaches and maybe some deeper marks also. I would also imagine most sessions will be done during daylight even though I'm sure the night hours would proberly be better?

most sessions done at night time now- pretty much the same species as the summer on the baits in galway/mayo - the spinning is pretty much finishing up

im also interested to find out more about winter fishing. was out last week and caught colefish(i think)really enjoyed it but would love to catch some other species. was using mackeral