My son caught some type of lizard in our local river under the rocks -could they be salamanders? he has them in a tank with a few rocks and is feeding them fish flakes. Any idea how long they might last? He replaces the water by half everyday with tap water that has been sitting for 24 hours? Any advice appreciated.
My son caught some type of lizard in our local river under the rocks -could they be salamanders? he ... He replaces the water by half everyday with tap water that has been sitting for 24 hours? Any advice appreciated.

Where are you located? What was the environment from which the creatures were removed? What do they look like? Do you have any concern about possibly removing endangered species, or, for that matter, whether or not they die at all?
Oh, and salamanders are not lizards.
nj" "m

"I do not rhyme to that dull elf
Who cannot imagine to himself..."
If I didn't care whether or not they lived or died I don't think that I would be writing for advice - do you?
If I didn't care whether or not they lived or died I don't think that I would be writing for advice - do you?

You didn't care enough to find out what they were and what they required to survive before you removed them from their natural environment and put them in a tank. I think it's entirely possible that a person who did such a thing wouldn't have much investment in their survival.
Apparently you care enough to reply to me over that comment, but not sufficiently to type in some actual facts. How do you expect anyone to give you any help at all when you don't so much as specify a continent?
So I will go ahead and give you some advice that stands regardless of where you are, what environment from which the creatures were removed, what they look like, whether or not they might be endangered species and such and just give you an answer based on the assumption that you do care whether they live or die, and that you'd prefer the latter to the former.
Put them back. If you want to get some pets, do your homework beforehand, pay particular attention to such things as husbandry requirements and the suitability of particular species to your needs. If you want to keep wild-caught animals, ensure that it's legal to do so with that critter in your area.
nj"support group"m

"I do not rhyme to that dull elf
Who cannot imagine to himself..."
My son caught some type of lizard in our local river under the rocks -could they be salamanders? he ... He replaces the water by half everyday with tap water that has been sitting for 24 hours? Any advice appreciated.

And, in case you're wondering, you'll seldom find anyone that's quicker to leap to a conclusion and put down someone asking a question than Ms. Marsh. Just thought I'd mention it, perhaps it's an ego thing.
No, actually I wasn't wondering - her type is obvious...but thanks for the heads up
oh btw - did I mention that the river where he found these lizard like things was the Amazon? oh - and they glow in the dark