三筋 みすじ琉球 りゅうきゅう雀鯛 すずめだいであれば
misuji ryūkyūsuzumedaideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 三筋琉球雀鯛

1. If it were a three-striped Ryukyu parrotfish; If a three-striped Ryukyu parrotfish existed

Ba Conditional