This interesting flag is displayed at the Low Head Pilot Station Museum (Tasmania, AU).
The ensign at the Low Head Pilot Station is the house flag of Oceangas Services Australia Pty. Ltd..
A very dark blue, with the southern cross in white in the hoist half, stars with 7 and 5 points as in the Australian national flag, but tilted slightly towards the upper hoist corner. In the fly is a fish in white outlined black, "breathing" a red flame.
The very same fish appears on the house flag of the French shipping company "Gazocean", probably not the result of a mere coincidence.