The Seafaring mod aims to add more substance to bodies of water in Minecraft. The sea floor now has a few new resources you can collect like rocks and pebbles but also salt piles. These can be converted to salt to make salted fish and meat.
This mod also adds a couple of new fish: the haddock and swamp feeder.
With compressed sponges you can soak up a much larger body of water for easier clearing. You can then dry the soaked sponges out for re-use by putting them in a furnace.
And there’s even some biome specific loot you can find while fishing like a message in a bottle that may lead to treasure!