Here's why:
* Mucus: Fish have a layer of mucus on their skin that helps them move through water more easily and protects them from bacteria and parasites. This mucus is what makes them feel slippery.
* Scales: Many fish have scales that are smooth and overlapping, which also contributes to their slippery nature.
So, instead of asking what type of fish is slippery, you could ask:
* Which fish are particularly slippery? (Eels, catfish, etc.)
* Why are fish slippery? (To explain the mucus and scales)
Let me know if you have another question about fish!