If they're anything like asotus, they're practically indestructible and will do fine in the can- possibly even for the next week and a half (though that certainly isn't good for the fish). Have personally witnessed masses of asotus crammed into washtubs for days on end at markets in South Korea; supposedly they did fine like that, and were fed ripped up weather loach bits so they didn't starve. Seen the same thing with Channa argus, and some sort of eel as well, though it seems as though any live freshwater fish other than Misgurnus being sold at said markets seem to be a rarity nowadays.