Fisc-wylle

According to the Old English Dictionary:

-welle;

fisc-wylle

adj. [cf. weallan to swarm] Full of fish, abounding in fish; piscíbus abundans, piscōsus :-- Ðæt eálond is fiscwylle the island is abounding in fish, Bd. 1, 1; S. 474, 41. Fiscwyllum wæterum flŭviis piscōsis, 1, 1; S. 473, 15. Fiscwelle bisarius? [= piscārius], Wrt. Voc. 66, 8. fisc-wylle