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Now I wonder how big their lobsters are.

[EDITED. I was talking of the wrong species]

There are some giant crayfishes in Australia. Much bigger than the standard old world crayfishes. Some (Cherax) can be raised in captivity and are very similar to lobsters in size and color, except that they are non marine.

Closing sea ports should not to be a problem for those species at short term (as long as there are reserves of crayfish food remaining of course).

Technically, they're langoustine.

Literally, they are kōura. Technically, they are https://en.wikipedia.org/wiki/Jasus_edwardsii

Edit: the dictionary says langoustine are another species, although one of the joys of English is making it mean what you want!