I’ve never seen or heard of anything like this before…
I assume chemicals are not good for fish until I learn otherwise… therefore I would assume that duct tape glue is toxic… until I learn otherwise…
If your fish made it safely, then no harm done. But I wouldn’t repeat the method without learning more detail. I’d be very interested to hear the shippers response to questioning on this. It’s always nice to learn something new.
Although since Duct Tape is such a common material, and fish shipping has been going on for quite some time, it’s hard for me to imagine that this would be a new breakthrough idea.
… but don’t let us cloud the topic with our speculation… ask the shipper and see what they have to say…