Fishing hook has a name "unknown" and I'm not sure what its entity ID is.

Steps to Reproduce
Obtain a fishing rod and cast it. Stand close to the hook, making sure no other entities are near, and execute the following command:
/testfor @e[type=!player,c=1]
The command will return the following message: Found unknown

Suggested Fix
Make the fishing hook have a name, like "Fishhook", and perhaps make clear what its entity ID is.