"שלושים וארבעה דגים שוחים כאן!"

Translation: Thirty four fish are swimming here.

[Alex387130]

if fish were not masculine, would the number be שלושים וארבע?

[cyanivde]

Yes

[danny912421]

shloshím ve-arba'á dagím sochím kan.

[matan156253]

why is it fish and not fishes?

[IngeborgHa14]

In Hebrew דָּג is a normal countable noun. But in English, for more than one, fish is the usual plural form. The older form, fishes, can be used to refer to different kinds of fish.