Join Marlin magazine for a worldwide tour of the best fishing destinations in December and January for blue, black, striped and white marlin, sailfish, swordfish and more. From big numbers to big fish, it's all here. During this time, the bite's on in Costa Rica. Large schools of big Pacific sails can be found harassing baitballs beneath frigate birds and around schools of spinner dolphins within 40 miles of the coast. The fishing can be simply phenomenal: Multiple hookups are the norm, and 10 or more sailfish releases a day are not uncommon. That's Where the Bite Is for December and January!