alevin
noun
al·e·vin ˈa-lə-vən 
: a young fish
especially : a newly hatched salmon when still attached to the yolk sac
Example Sentences
Recent Examples on the Web The pictures range from aerial landscape shots to extreme closeups of things like the jaws and eyes of salmon, freshly hatched alevin, and roe. 
David James, Anchorage Daily News, 19 Jan. 2020
David James, Anchorage Daily News, 19 Jan. 2020 Word History
Etymology
French, from Old French, from alever to lift up, rear (offspring), from Latin allevare, from ad- + levare to raise — more at lever
First Known Use
1864, in the meaning defined above