It depends on the type of crab you are referring to. If it is a hermit crab, it will eventually die because hermit crabs need seawater (seawater contains iodine and other minerals that support the growth of the crab.) If it is a normal crab (the ones you eat and cook) it can adjust to the environment or the freshwater you were talking about. If crabs can live in land, so do they live in fresh water.
It depends, Tuna is salt water, Trout is fresh, halibut is salt, flounder is salt.
Saltwater
Angelfish live in saltwater
Flounders are saltwater fish, some can be kept temporarily in brackish water.
Flounder are saltwater fish that live in lagoons and estuaries. Flounder species are found along the Atlantic coasts of the US and Canada, in Europe, and in Japan.
Saltwater.
freshwater and saltwater
No
It lives in both. It is primarily a saltwater fish but does adapt to live in strictly freshwater (not just brackish)
no they can't they have to live in freshwater
A saltwater fish tank can be half freshwater and all of the saltwater fish will live but not for very long.
Freshwater mussels live in freshwater habitats like rivers and lakes, while saltwater mussels live in saltwater habitats like oceans and seas. Freshwater mussels tend to be smaller in size compared to saltwater mussels, and they have different behaviors and ecological roles in their respective ecosystems.