Category talk:Individual Shoal

This page is so confusing
What does "individual Shoal" mean? I see multiple characters from different species listed here. Scratch and Sim are members of the Shoal of the Winter Harmony as seen in 'The Husbands of River Song' and 'The Return of Doctor Mysterio' but the other three characters; Darkin, Makron and Icktheus are all members of the Shoaly species from the 2011 story 'The Underwater War'. Xx-connor-xX ☎  23:34, December 26, 2016 (UTC)