The fish familiars... definitely talking about Coelacanth, right? It's absolutely ancient and still around. I think i first learned of their existence with X-COM: Terror from the Deep, which had robotic drone tanks you could field which were named after them. Very useful to scout and draw fire from your harder-to-replace aquanauts, and give fire-support.
That look she gave him as she's about to head off and take care of some of the prep herself while he makes a hard decision... I understand why he can't dare to hope, but anyone looking in knows she's looking at him with so much love. (page 7, by the way)
And, yeah, as others pointed out, that saleswoman doing a phenomenal job, and now we're pretty much guaranteed to have Gojo notice them, somehow.