2. Hermit crabs are divided into marine species (such as black and blue feet), terrestrial species (such as gray, short wrists and concave feet) and semi-marine species (such as orange red).
3, orange-red hermit crab is commonly known as strawberry. Strawberries can be raised in seawater completely, and marine hermit crabs will not drown in the sea. Strawberry can be said to be a kind of mangrove living in shallow water. There is another osmotic pressure involved here. Strawberry gills can completely survive in seawater. It is ok to take a fresh water bath once a week, usually raise it in seawater, or mainly supply seawater. There is a great difference in osmotic pressure between fresh water and seawater, which is also the reason why terrestrial hermit crabs cannot be raised in fresh water. Strawberries can't be cultivated well, have a short life and fade, mainly because of seawater, which requires high-quality seawater elements and standard seawater values. The density meters on the market are basically inaccurate and cannot match the standard seawater value.
Similarly, in fact, terrestrial hermit crabs can survive in seawater for a long time, which is why both marine hermit crabs and terrestrial hermit crabs are caught near the coast. The gills of terrestrial hermit crabs can withstand the osmotic pressure of seawater and can breathe in seawater. Fresh water feeding is not good.