That depends on the species, as there are freshwater clams.
yes
No.
No, they need saltwater.
A yoldiid is a member of the family Yoldiidae, a family of small saltwater clams in the order Nuculanoida.
An ark shell is a member of the family Arcidae of saltwater clams or marine bivalve molluscs.
Fresh water clams live in fresh water and salt water clams live in salt water.There are both freshwater and saltwater clams. Mussels fall into this category as well. See the related links for both.
you should eat freshwater clams/oysters
sharks, seals, octopuses, lobsters, clams, clownfish, eels, sea urchins, dolphins, and jellyfish just to name a couple
NO
Yes you should soak clams in a mixture of 1/3 salt to 1 gallon of water before grilling
All saltwater life requires a salinty level of 1.020 to 1.025. General rule of thumb to hit this range is 1Kg (2.2 pounds) of salt to 30 L (7.9 gallons) of water. Clams included.
The soft shell clam is a saltwater animal. The soft shell clam lives in the mud of the water about 10 inches beneath the muddy surface. People and animals eat the soft shell clam as a protein source.