Which fish has a smaller attached to it?

This question is a bit tricky! It's likely you're asking about a "remora," sometimes called a "suckerfish."

Remoras are known for having a modified dorsal fin that acts like a suction cup, allowing them to attach to larger marine animals, like sharks, whales, and even sea turtles.

However, the question "which fish has a smaller attached to it" is a bit ambiguous. Do you mean:

* Which fish has a remora attached to it? Many fish can have remoras attached to them.

* Which fish is the smallest remora? The smallest remora species is the *Remora brachyptera* (also known as the Dwarf Remora).

Please clarify your question, and I'll be happy to give you a more precise answer!