An unconventional app is bringing Kiwis together through a love of fish heads.

Free Fish Heads allows fishers to connect with seafood lovers who are after often-discarded fish parts - including fish heads - for cooking purposes.

The app is the brainchild of TV fishing personality Matt Watson, who says there's no excuse for discarding perfectly good food.

"It's about making connections with people - because people that often have the disposable income to be able to have a boat and go fishing don't often mix with people who eat fish heads. It's not a conscious thing, it's just different sub-sections of our society."

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