Hi guys, i have decided to add this thread, to help people with learning the best seaons for the fish they want to catch.

Bass - Mainly between April - December. Even more between May - Octobar. Even more between July - September.
Bream - Mainly between April - Octobar. Even more between May - September. Even more between June - July.
Brill - Mainly between April - Octobar. Even more between May - September. Even more between July - August.
Coalfish - Mainly any time of the year. Even more between January - April. Even more between November - December.
Cod - Mainly between Jaunuary - May. Even more between September - December.
Conger eel - Any time of the year. Mainly between April - December. Even more between July - November.
Dab - Any time of the year. Mainly between Febuary - Octobar.
Flounder - Any time of the year. Mainly between April - July, and then again between Octobar - December.
Garfish - Mainly between May - Septmember.
Haddock - Mainly between Janualry - May, and then again between Septmember - December.
Herring - Mainly between April - November.
Ling - All year - mainly between July - Octobar.
Mackerel - Mainly between April - November. Even more between May - September.
Mullet - Mainly between July - September.
Plaice - Mainly between April - December.
Pollack - Mainly between April - November.
Tope - Mainly between April - September.
Whiting - Mainly between January - April. Then again between September - December.
Wrasse - Mainly between April - December.

These are based on the monthly typical weather patterns that we have in the UK, although it may very due to breeding, temprature and climate

I hope this information helps!
Tight Lines!