Lavasioth Ecology

Disclaimer
This is merely a plausible explanation for the monster(s) in this article, and should not be considered canon.

In-Game Information
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Taxonomy
Volganos is related to plesioth, though whether it's a off shoot or a far older speices is up to debate.

Habitat Range
Volganos has adapted to the volcano, as such it is incapable of living else where.

Ecological Niche
volganos appears beyond the normal for the volcano. they have only appeared recently and thus appear to be taxing the volcano prey population greatly. however they may be a primary food source for the ankantor and Crimson fatalis. both of which are capable of catching lava swimming creatures, Ankantor who can swim after them and Crimson who can fly.

Biological Adaptations
Volganos is a fearsome beast indeed. Having a layer of hardened lava on its skin makes it very durable. Another ability is that it can spit mamga at prey and foe alike, possibly the most horrifying attack yet. Only armor with extreme fire resistance can survive a direct hit from such an attack. Otherwise, the creature fights much like a Plesiloth

Behavior
This creature is much like Plesloth and will stay in the lava. The hunter will have to scare it out to battle it on land. Meanwhile, the fishy monster will fire jet streams of lava at the unfortunate hunter. This is wrong or at least has been in my fights in which he prefers to be and the ground and will immediately (or at least very quickly) and hop back out at you.