Hello is there any way to decrypt the passwords from navicat? 

Yup. Md5 something..

http://www.md5online.org/

There is no way you can decrypt an md5 hash. It is an one way encryption.

 

What you can do is browse databases that have passwords and their results to md5 and see if the password you want to know about exists in it.

Yup, not every password you can 'crack' using that 'tool'.