pBack in February, co-founder of Lionfish University Jim Hart a class="link" rel="nofollow" target="blank" href=" what is thought to be the first piece of footage of a grouper eating an invasive lionfish without human intervention. The non-profit organisation has studied fish behavior extensively, but it wasn’t until May 2015 that they captured footage of a trumpetfish shadow feeding with a tiger grouper. The trumpetfish proved to be an unwelcome hitchhiker stalking his prey.