根魚

Compound of 根 (ne, “root”) +‎ 魚 (uo, “fish”).^[1][2]

• (Tokyo) ねうお [néꜜùò] (Atamadaka – [1])^[2]
• IPA^(key): [ne̞ɯ̟o̞]

根(ね)魚(うお) • (neuo) ^{←ねうを (neuwo)?}

1. a non-migratory fish that lives among the roots of seaweed or coral

   Synonym: 根付き魚 (netsuki-uo)

2. synonym of 鮎並 (ainame): a greenling (kind of fish)

Compound of 根 (ne, “root”) +‎ 魚 (sakana, “fish”).^[1][2] The sakana changes to zakana as an instance of rendaku (連濁).

• (Tokyo) ねざかな [nèzáꜜkànà] (Nakadaka – [2])^[2]
• IPA^(key): [ne̞za̠ka̠na̠]

根(ね)魚(ざかな) • (nezakana) 

1. a non-migratory fish that lives among the roots of seaweed or coral

The neuo reading appears to be more common.