I would go with folklorists who have collected work songs used by fishermen and defined them as chanteys. Alan Lomax recorded Italian and Sicilian capstan chanteys used by fishermen. Yes, they had capstans aboard their fishing vessels. Same call and response as in any deepwater chanteys. Then there are the Menhaden chanteymen and the West Indies rowing whalemen. Folkloric scholarship supports a definition of chanteys that includes fishermen.
On another matter, to further support JWB's point about shore songs turned into chanteys, check out Hugill. "Johns Brown's Body" and "Goodnight, Ladies," used at rthe capstan, with salt-water changes to lyrics, to mention two.
JWB, you're a bit modest. Anyone who knows your real identity knows how knowledgeable you are about sea music.