I logged up that way at Rodrick Island in Douglas Channel and we would prawn 5 mins. from our float camp and catch prawns like that all the time.Just like a small lobster tail lol.Got to the point we all got so sick of prawns as we had little freezer space
available and would have to eat most of them.The camp cook would throw them in everything.Prawn omlettes, prawn pizzas,prawn lasagna.You get the idea.I don't know if they are a different sub species of them up there but ya they can get huge!