When I was growing up in the 90's we had a VHS of a movie. The movie featured space, a strange planet, space pirates, and invisible fish. Some details I remember are that the kid in the movie gets a cloak of the invisible fish scales allowing her (I think) to turn invisible. The father was going after some space pirates and was catching one when the space pirate tried to kill himself with a cyanide pill. Another thing was they were getting a signal from a supposed to be abandoned planet and they found a robot there. Hope you can help.

A girl and her father tour the planets in search
Of strange alien animals

The girl's given a hat made from
A species of invisible fish, which
Allows her to become invisible.

The father and daughter stumble upon
A conspiracy. One of the conspirators
Is caught he poisons himself rather than
Give up.

Sounds like,.

The Mystery of the Third Planet


View at Youtube


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Thank you, that's exactly it! :D