Hi Togo, around about the end of December all the pollack over about 3lb go off into deep water to breed. I'm not sure how deep exactly but I think maybe 40 to 50 metres or even more. They start coming back inshore from March onwards and the best months are June to November when fish like these can be caught - if you get lucky.
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Pollack can then easily be found in depths from 5 metres to 20 metres (and on down way deeper if you can dive it!).
I mostly hunt them on rocky reefs and broken and weedy ground between 10 and 15 metres.
Some bass are present all year round but the best months are from March to September. The Irish bag limit for bass is 2 fish per day and there is a closed season for them from 15th May to 15th June.