Can blackbelly rosefish ("cantarilho" in Portuguese) or HELICOLENUS DACTYLOPTERUS, a fish, be considered a substitute of spiny lobster ("lagosta" in Portuguese), a crustacean?
Some people say, after cooking a seafood rice with both, you can't differentiate the fish (fish loin only) from the lobster anymore.
Since the price for lobster is significantly higher than for the fish, I wonder how to detect if it was cooked with crustacean only, or was "stretched" with blackbelly rosefish?
blackbelly rosefish
source wikipedia.org
spiny lobster
source mundoecologia.com.br