opsophagy - nonce-wd. [from the Greek word meaning 'the eating of dainties']

The eating of dainties, esp. of fish. So opsophagist, an eater of dainties;
opsophagize v. intr., to eat dainties.

1854 BADHAM Halieut. 519 Opsophagy again was necessarily confined to the rich. Ibid., At Corinth..the law enacted that none should ‘opsophagize’ but such as could prove their income sufficient to support the extravagance.

opsomania - A morbid longing for dainties, or for some particular food. Hence opsomaniac,
one affected with opsomania.

[OED2]