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So Yona gets swallowed by a fish and the text saysוַיְהִ֚י יוֹנָה" בִּמְעֵ֣י הַדָּ֔ג שְׁלֹשָׁ֥ה יָמִ֖ים וּשְׁלֹשָׁ֥ה לֵילֽוֹת" (and Yona was in the bowels of the fish [masculine] for 3 days and 3 nights) and then Yona prays to G-d "מִמְּעֵ֖י הַדָּגָֽה" (from inside the fish [feminine]). The question is why the switch between male & female?

There are lots of explanations and the most common (including Rashi's) is that there were two fish. He was in a male fish and then he was spat out of that fish and immediately swallowed by a female one, which was pregnant.

But when I was in HS, I learned another explanation, unfortunately I don't remember the source, but basically: Some male fish get pregnant and that's what happened here. And once it became pregnant, it's referred to in the feminine.