A bar is set up like a beach cabana and faux crayfish pots hang from the ceiling, as do TV screens showing music videos so old that our waitress called them weird and the Professor and I recognised all the acts.
Fortunately, there is more than crab on the menu. The "shackboards" choices include delicious trios of commendably gristly tuatua fritters with jalapeno creme fraiche and cakes of minced crab and crayfish with a wonderful coconut aioli. The seared tuna with ribbons of pickled cucumber was like cajun sashimi, although the lime and coriander dressing wanted for character.
More substantial mains (lamb rump, blackened fish) were well discharged although both came with a chipotle slaw full of peanuts, which are famously allergenic: a warning at the very least was in order.
And putting a caesar salad in a jar made as much sense as serving chicken broth on a banana leaf.
Teething troubles are mainly to do with service: different T-shirt colours denote different duties, but when a black-shirt hostess stood nearby smiling inanely as we waited for a grey-shirt waitress to take our order, it reminded me of the old 70s demarcation disputes on the nearby wharves.
The bottom line is The Crab Shack is less a dining-out destination than a relaxed and fun place to be. I'm sure it will go off like a rocket.
Crab $33-$112; entrees $15-$25; salads $15-$27; mains $26-$29; burgers $22-$24; desserts $12.50
Verdict: As much about fun as about food