From 2speccers2tools wiki

Though the seas are crowded with a number of piscine lineages, the nomfauna have continued to diversify to fill new niches. One of the most important developments thus far was the spitescale.

Spitescales have a number of adaptations making them nearly immune to spiteful prey. The key adaptation is that they are able to remove excess spite from their body using specialized microbes: the spitebrain. These microbes mainly line the gut along with the sunscreen cells, but also penetrate deeper into the body in a manner similar to roots or mycelia. These microbes absorb the spite from prey items and transfer it to the outer skin, where the spite is sequestered. Their bark is now divided up into neat hexagonal scales, which are periodically shed along with extremely high amounts of spite. These shed scales are known as spiteful scales, and may prove to be a unique food source for anything that can manage to break down all of the deadly spite. Being covered in spiteful scales naturally makes the spitescale highly toxic, so it has developed warning colors to show predators that it means business.

Other than the spiteful scales and microbe symbiosis, the spitescale has even more tricks up its sleeve. Two extra fins located on the sides increase mobility, helping the spitescale to chase its prey. Especially tricky prey is dealt with using the novel manipulatory tentacle found below the mouth, which also serves to uproot spiteflora. The spitescale now has more light-sensitive patches, being roughly circular and more concentrated, making its vision ever so slightly clearer. The spitescale actively chases organisms containing high amounts of spite, which it can smell.