Goldfish can. my goldfish are in a very high PH for 6months.
Fish can tolerate very little temperature variations.
The blow fish species are often found in saltwater environments. Some species can tolerate brackish water.
Most fish can tolerate a temperature under 68 degrees.
Zebra Danios can handle a small amount of salt in their water but it is not a smart thing to have in your fresh water tank. The reason for this is, salt can be used as a medication for some fish ailments. If there is salt already in the water, in order to dose the fish you will have to put in a measured/correct amount of salt thereby overdosing the tank and maybe killing the fish.
Cherry Barbs are fresh water fish. Putting them in salt water is not only wrong it is cruel.
Most tropical fish will die if left for extended time in cold water. Some tropical fish may be able to tolerate cold water, but the result would likely be early death and disease.
The zebra fish will have a higher respiration rate
Just like you and me, fish can tolerate different levels of stuff in our air or water. For example, some people can tolerate a high level of pollens in the air, and some people get sick easily when there are pollens in the air.Think of the people who can't tolerate pollens in the air as freshwater fish and the ones that can as saltwater fish. A lot of it has to do with your environment and genes, and a starfishes environment is in the sea, so they have adapted through evolution to the saltwater in their environment.
The ability to survive or tolerate a quantity of salt in the water in which the fish live. More salt tolerance can cope with more salt in the water and vice-versa.
Cold water fish like gold fish prefer water in the range of 64-68. Warm water fish like guppies like 70-74 and can be even higher.
Could very well be. If brought from ocean it will contain billions of bacteria and pollutants the Beta is unfamiliar with and therefore has no defenses against. Also ocean sand will raise the ph of the water to a possible higher amount than the fish can tolerate. There is also the fact the sand, if wet, will turn your freshwater brackish and possibly increasing your waters salinity to a degree higher than your fish can survive. They do make a dry freshwater sand.
Yes. The oscar is a freshwater fish, and cannot tolerate saltwater.