How do donut fish eat?
Imagine a particular species of eel that resembles the shape of a torus or donut. It is capable of generating an alternating electric current in the water as a form of communication between other donut eels, analogous to a step up/down transformer, and it can deliver a powerful electric shock to stun/kill any unfortunate nearby creatures. It also has a swim bladder for controlling buoyancy at depth and gills for breathing. However, it needs to swim constantly like some species of sharks to draw oxygen-rich water through its gills, and this consumes lots of energy. When in peril, the donut fish quickly forms into a potato chip shape to store potential energy, mimicking the shape of muscle in a peacock mantis shrimp's hammers. This can be used to deliver powerful movement, but it also requires tons of energy.
Without a mouth, how can the donut fish feed to meet its daily energy requirements in the open sea? Also, feel free to explore the mechanisms for generating A/C current without accidental self-harm or misfires.
This post was sourced from https://worldbuilding.stackexchange.com/q/167457. It is licensed under CC BY-SA 4.0.
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