San Diego, CA. August 26, 2014. Pfleger Institue of Environment Research (P.I.E.R) researchers prepare to tag a swordfish (Xiphias gladius). P.I.E.R has been developing and testing deep-set bouy techniques for swordfish off Southern California. The experimental gear is designed to selectively target swordfish at depth during the day and simultaneously avoid sensitive bycatch species like sea turtles and marine mammals.