Feminine of dag, and meaning the same -- fish.
see HEBREW dag
H1710. dagah
דָּגָה noun feminine fish (Late Hebrew id.) — דָּגָה Numbers 11:5 5t.; construct דְּגַת Genesis 1:26 4t. + Ezekiel 29:4b (strike out B Co); suffix דְּגָתוֺ 47:10 ᵑ9 ᵐ5 Co; (דגתם ᵑ0), דְּגָתָם Isaiah 50:2; Psalm 105:29 + Ezekiel 47:10 ᵑ0 compare above — fish, almost always collective; fish of sea הַיָּם דְּגַת Genesis 1:26, 28 (P) Ezekiel 47:10 (in simile); in Nile (יְאֹר) Exodus 7:18, 21 (E) compare Psalm 105:29, יְאֹרֶיךָ דְּגַת Ezekiel 29:4 (twice in verse) (compare above) 29:5; in sea and rivers Isaiah 50:2; Ezekiel 47:9-10, food in Egypt Numbers 11:5 (JE); image of fish forbidden in worship, as of beasts and birds Deuteronomy 4:18 (on sacredness of fish, and use in sacrifice compare SeldenDe Diis Syris, ii. 3. RSSern. i. 274); of single fish only Jonah 2:2 (2:1 (twice in verse); Jonah 2:11 דָּג) by late usage; compare conversely דָּאג = דָּגָהcollective Nehemiah 13:16.