Horine krill
Considered to be a pest by Belaul fishers who risk the ice sheets, horine krill are a euryhaline species of crustacean very similar to shrimp which can be found in the freshwater shallows of Lake Ulula on Paperweight.
They scavenge for the scraps of food left behind by predators and often gather in cavernous burrows (called harbors) that they dig in the undersides of floating ice. They are able to extract salts from their diet or from urine passed by semi-aquatic animals such as hocavi, excreting it within their burrows as a pale green cloud of brine that soon fills their harbors. By lowering the freezing point of the water, their home becomes a trap for curious fish who slowly drift into dormancy and death without noticing the danger, becoming an incredible windfall to the krill.
Unfortunately, the use of burrowing and brining weakens the ice and forms structural faults that can be lethal to even the most prepared of hunters, leading wise Belaul to dispose of their waste in forests rather than near water sources.