My freshwater animals wishlist:
1. Grey crowned crane
2. Chilean flamingo
3. Southern screamer
4. White-faced whistling duck
5. Pink-backed pelican
6. Scarlet ibis
7. Black-faced ibis
8. Roseate spoonbill
9. Black-necked swan
10. Hawaiian goose (Nene)
11. Black swan
12. Magpie goose
13. Canada goose
14. Mallard
15. Mandarin duck
16. Abdim's stork
17. African sacred ibis
18. Hamerkop
19. Southern bald ibis
20. Nile crocodile
21. False gharial (also called Tomistoma)
22. Chinese alligator
23. Fishing cat
24. Père David's deer
25. Sitatunga
Although in the wild the Hawaiian Goose, also called Nēnē, lives on lava fields, in zoos it is kept together with other water birds, and there are many pictures of it swimming in the water in zoo enclosures. However, if it turns out to be a problematic species, an alternative is the Red-breasted Goose.