1) Baby eel 2) Baby moray 3) Callow conger 4) Eliminate by laser 5) Fish 6) Fisher of eels 7) Glass eel 8) Little eel 9) Mini-moray 10) One in a conger line 11) School organisation 12) Small eel 13) Type of eel 14) Wee wet wiggler 15) Young conger 16) Young conger eel 17) Young eel 18) Young migratory fish Found on https://www.crosswordclues.com/clue/elver
(from the article `migration`) ...shelves. When they are about two and one-half years old and about eight centimetres long (a little more than three inches), a metamorphosis ... Found on http://www.britannica.com/eb/a-z/e/25