Spiny dogfish actively uptake toxic ammonia across their gills, convert to valuable urea, which is then used for osmoregulation and supplement dietary nitrogen for protein growth.
Blog October 2016
How does female mate choice influence male reproductive tactics and postcopulatory competition in midshipman?
John L. Fitzpatrick (Stockholm University) and authors describe how female mate choice can potentially influence sperm competition risk and shape investment patterns in males between and within male reproductive tactics.