A large, docile herbivore which emits oxygen and is defended by the small, aggressive symbiotes which accompany them.
- Slow, stupid and delicious - Complex gills line the inside of the hole, drawing cold water in, and emitting warm, oxygen-rich water in its place - Attracts symbiotes, which make the holefish their home and fiercely ward off any approaching lifeform - Migrates more or less at random, feeding from nutrients deposited by the symbiotes
The titan holefish has evolved entirely beyond basic survival mechanisms like speed, intelligence or hunting. It exists in a semi-permanent state of unreflective calm, swimming forward on impulse, fully trusting the complex ecosystem which supports it.
Assessment: Valuable oxygen source, if you can reach it