Can tortoise and fish put in the same water tank?

If both are very small then yes, you can put both in same water tank.Even I saw in Aquarium,where they put small tortoise and fishes in same water tank.

We have a crayfish in our tank, and when she grew her claws back, one day she had hold of the goldfish and had ripped part of a fin off. We partitioned the tank. It probably is the turtle, and you might want to separate it from the fish.

Wow... Your question worries me. 1st ( I hope this is just a grammatical mistake )but tortoises are land turtles. You shouldn't have one in an aquarium with fish in the first place. They don't swim well. 2nd, what do you thing turtles ( I assume that's what you actually have & am giving you the benefit of the doubt ) eat? Fish is DEFINITELY on the menu. I'd suggest you put in some research time.

I know that a turtle will dirty the water and unless you have a very large tank your fish will die. By the way a tortoise is a land animal and turtles are the rest of them. (Pretty sure this is right.)

You are just feeding your tortoise with your gold fishes my dear. If your tortoise is a bit bigger and you have placed that fish in a tortoise tank, yes that is the solid reason why you have half bodied fishes. You as an owner should have observed the behavior of your tortoise. But for me, it was clearer than water that your tortoise is the main culprit of eating your fishes. Keep them separated because this naughty tortoise is so aggressive attacking your fishes.

dont do for ever if you do like this the tortoise starts eating your gold fish and any small ones so dont make them together. It is better to place tortoise in a wise area like some pool like that. Because if the surface is not free it will try go out so keep a wide surface.

But how does the tortoise catch the goldfish? I would have tried the same thing I am sure! But you may have to have a separate tank for the tortoise it doesn't sound like he understands tolerating other cultures or respecting the rights of other!

i think you should separate them because if you want a goldfish you must buy other fish that is goldfish too. goldfish are sensitive when they get stress and the water is not clean, they always die. i have goldfishes here in my tank only gold fish but different types. i also have a fish tank for fresh water because i'm a fish addict. i want to collect fish especially in the sea water like clown fish and other fishes that lived in sea water. in sea water, it is high maintenance because you should always check the salinity by using aquarium hydrometer because they also die if it is in low salt or high.