Yes they do. Newts and other amphibians should never be kept with fish if you want the fish to survive.
NO,they will not eat newt eggs unless there really hungry the will stay with goldfish flakes and other stuff
No. It is much more likely that the salamanders will be biting chunks out of the goldfish.
the things that eat and treat newts
yes, bids do eat newts
Under water newts eat worms.
Newts do not generally eat leaves. A newts diet generally consists of earthworms, snails, small fish, and a variety of insects.
Yes newts can eat Triops. Care needs to be taken with smaller newts, that the Triops arent too big. Larger newts like paddletails will have no issues with larger Triops.
no
bloodworms. A small amount. i have a 3year old spanish ribbed newt and i feed it half a cm of frozen bloodworms everyday. they can also eat cut up garden worms but i"ve found that when you do it's hadr to make them eat bloodworms again. Also small crickets but they'll be hard to catch cuz newts are mostly blind.
If you eat one.
Yes
Cats do attack and eat newts _ see http://george-online.blogspot.com . Froglife (www.froglife.org.uk) suggest making sure there are plenty of amphibian hiding places -- weed in the pond, log piles, long grass etc. The cats I know that catch newts get the newts when they are out of the pond but I expect some cats will fish them out of the pond too. Some cats clear ver small ponds of goldfish! More on www.celiahaddon.com