Meaning
板甫牡蠣 (いたぼがき, Itabogaki) is Itabogaki — a Japanese food (water animals).
What is Itabogaki?
Itabogaki ( Ostrea denselamellosa ) is a species of oyster. In the past, these oysters were collected as a common species and distributed as food, but in recent years the amount of catch has dropped sharply, and attempts have been made to recover the population by seeding.