News in Brief Animals Integrative and Comparative Biology Notes from the Society for Integrative and Comparative Biology annual meeting, San Francisco, January 3-7 By Susan Milius January 15, 2013 at 7:30 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print Pregnant male pipefish have hormone swings The first study to track a form of testosterone through male pregnancy in fish has found an unusual roller coaster of swoops and spikes. Among pipefishes, seahorses and sea dragons, females produce eggs but males get pregnant, carrying the embryos.