I don't know about the Northwest Shamrock, But Winter in my part of the owrld usually opens up a whole new box of angling possibility. Shoals of Coaly and Codling seem to start moving in around late October til January, then it dies off, leaving ya with pouting and whiting and the like... Unable to Comment on the Atlantic Seaboard, though each year, Belfast Lough fills up with Plague proportions of Mini Whiting... joy.
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