Young moray, e.g. (5)
I believe the answer is:
elver
(Other definitions for elver that I've seen before include "Young migratory fish" , "Immature eel" , "Immature fish" , "Young swimmer" , "Young, migrating eel" .)
I believe the answer is:
elver
(Other definitions for elver that I've seen before include "Young migratory fish" , "Immature eel" , "Immature fish" , "Young swimmer" , "Young, migrating eel" .)