As of the update last week we have recieved several reports of blackfish's blowing up in Gravia trader once they spawn on the spawnpoint.
This is why we now advise our players not to spawn blackfishs in Gravia trader. If you have experienced this and have proper evidence contact an admin and we can issue a refund.
We are currently working on a fix to this issue. We thank you for your patience in the meanwhile.