In the recent update minecraft 1.13, many types of fish were added including cod, salmon, pufferfish, and tropical fish. I think swamps should get their own underwater mob, the leech.
If you get in water while in a swamp, all leeches in that same body of water will start to latch on to you (sort of like zombie pigmen except you don't have to punch one of them). If a leech attaches to you, you will get the nausea and poison effect. The only way to take off a leech is by jumping up and down until one pops off. The leech would only have as much health as a chicken but it would be very fast which would make it hard to hit, and when it dies it will drop a leech tail which could be used for brewing.
The leech tail could be used to make a blood potion. When drank, the blood potion could give you extra hearts (the amount of hearts would increase depending on the level of potion).
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