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The on-set interpreters were all CODAs (Children of Deaf Adults).
Emilia Jones spent nine months learning American Sign Language, having singing lessons, and learning how to operate a fishing trawler.
Troy Kotsur is the first deaf male actor to win an Oscar. His wife in the movie Marlee Matlin was the first deaf female actress to win an Oscar in the 59th Academy Awards 35 years ago (March 30, 1987), by Children of a Lesser God (1986).
The on-set interpreters were all CODAs (Children of Deaf Adults).
Because the fishing scenes involved real fishing, the cast and crew had to abide by local fishing rules. One day they actually had to bring an observer with them (life imitating art from the movie) and they had to move one of the crew members from the boat set since they could only have a maximum of 10 people on the boat.
In addition to standing for Child Of Deaf Adults, "coda" also means a concluding passage of music in a composition. The coda symbol is visible on the page of musical symbols Mr. Villalobos is teaching Ruby during a montage scene.