Ironically, at the time Watson was filming a show about a new fishing contest format he had come up with in a bid to reduce waste. In the new format, fish were photographed on a measuring board as proof of capture, with the top prizes going to the longest fish rather than the heaviest.
That meant fish did not have to be brought in and the angler could decide, based on need and conscience, whether to keep them or release them.
"Fishing tournaments are great to get people engaged in fishing and the marine environment. My only beef with them is they encourage participants to take more fish than they want or need," he said.
The new format will be introduced in the May 26 episode of the ITM Fishing Show.
Watson's account of dumped snapper in the Hauraki Gulf has sparked condemnation of the practice on the show's Facebook page, www.facebook.com/TheITMFishingShow.
In a lively debate about sustainable fishing practices, Watson calls for mandatory labelling of fish products telling consumers how the fish was caught.
That way consumers could support companies that used sustainable methods and avoid those that used methods such as bottom trawling.
"Let's not forget that there are still sustainable methods of commercial fishing, like long-lining for snapper, and decent, honest guys out there doing it," Watson said.
"So if everyone refused to buy bottom-trawl caught fish, and all products from the big companies, they would soon have to change their ways.
"It's time for mandatory labelling of how the fish was caught. That way we can support the good guys and avoid the bad guys."
Watson has also called on people to support LegaSea (www.legasea.co.nz), a New Zealand Sport Fishing Council programme working to boost fish numbers and protect the marine environment.