This is one of those few times where I believe in sharing certain mods created by others. The beached dolphins who are normally dead in the vanilla game are alive here with a mod named Aquatic Bestiary - Sea life to the Commonwealth. I shall put in links the mods that I'm currently using below:
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https://www.nexusmods.com/fallout4/mods/16915
https://www.nexusmods.com/fallout4/mods/47919
https://www.nexusmods.com/fallout4/mods/42446
https://www.nexusmods.com/fallout4/mods/35358
https://www.nexusmods.com/fallout4/mods/19037
https://www.nexusmods.com/fallout4/mods/42121
https://www.nexusmods.com/fallout4/mods/12999
https://www.nexusmods.com/fallout4/mods/12347
https://www.nexusmods.com/fallout4/mods/12770