If there was a common focus among the manufacturers’ exhibits at the 2013 edition of ICAST — the International Convention of Allied Sportfishing Trades — it was the umbrella rig, or products like it. From the Booyah Bait Co. to the rod builders at G. Loomis, nearly all the major players and many small companies introduced some product designed either to mimic the umbrella rig design or facilitate its use.