Fish & sea creatures could have lived. They didn’t need Noah’s ark. I guess birds could only survive on the ark; because of exhaustion after a few days of just flying around. Noah’s sons didn’t have to inbreed; they had wives who weren’t close kin. Animals lived on the ark. - Things back then were very primitive. If people got bored; they had the same loincloth to get unbored in. Earthworms wriggled in two by two. - As time went on, new & improved animals showed up on the scene, dogs sprang from wolves & the rest is history. Twinkie is kin to one of those people on the ark. It’s evident!
” I guess birds could only survive on the ark; because of exhaustion after a few days of just flying around.”
Sea birds might have made it, though they need dry land to breed. The flood only lasted a year though, so they would have only missed one breeding season.