Shellfish limits depend on one's location.
Some links for the bag limits of each state and the Northern Territory can be found below.
Tom Schlichter has written: 'How to catch clams by the bushel!' -- subject(s): Clamming, Cookery (Shellfish), Shellfish gathering
Mussels and oysters are at least two that I know of for sure.
Unless it has been commercially processed, the answer is almost certainly not. Australia has a very strict view on quarantine issues.
Although an exact number is not know, it is suspected that most households have a barbecue in Australia. Australians enjoy cooking shellfish, sausages, and lamb chops on their BBQ.
Australia has black lipped oysters, chiton, cockle shells, freshwater prawns, mangrove snails, mud crab, mud muscle, mud whelk, painted crayfish, rock oysters, and yabbies are types of Australian shellfish.
Animals such as crabs, lobsters, starfish, sea otters, and humans are known to eat shellfish. They have adapted to prey on shellfish using various methods, such as cracking shells with their claws, using tools, or suction feeding. Shellfish are an important part of the diet for many marine and terrestrial animals.
Australia
The plural of shellfish is shellfish.
ShellFish
shellfish
They are mollusks and not shellfish.
A Shellfish is can be a carnivore, herbivore, and omnivore depending on what kind of shellfish it is