In the Victoria Interior Sea, there aren’t much fish. It is very isolated and... alien. This world is the end of most endotherms as the average temperature of the world is 32c, and these seas are sometimes over 60 degrees. Horrible, noxious gasses accumulate in large ammmmmmmmmmmmmmmmmounts. Fish dont like dis.

Biology

Slish are large types of seaslugs, descendants of sea hares. They first evolved in the Holocene extinction where they could feast on mass carrion left by fallen birds and mammals. They evolved the large teeth to chew the thick, dense meat. Slugs already have teeth, in fact thousands, so it is plausible they merge together. After the extinction they branched into a few groups. The Kelp Cutters had massive non-protrudable jaws which they use to clamp on species on big leaf kelp. This group diverged into shell crushers which use their jaw to track open bivalves. There are a few species of ambush predators that have a long tongue like thingy which ends in four teeth (see gupgops from Serina). Then finally there are these predatory slugs.

Most swordfins have four fins to dart around prey. Their agility is surprising. They sit in the middle of the food chain. Eating large fish but getting eaten by even bigger fish.

Surprise! this is not a fish! next one is going to be something else entirely…