Sillock

Origin

From sill("newly hatched young of fish, fry") + -ock, ultimately from Old Norse síl/síld ("herring"), whence also dialectal Swedish sil ("the young of fish, fry") and Norwegian sil ("sand-eel"). More at sile.

Full definition of sillock

Noun

1. (Scotland) A pollock or a coalfish, sometimes especially a young coalfish.