Go shopping, have a meal or even take a cooking class at the Auckland Fish Market at Viaduct Harbour. Up early? Watch chefs and fishmongers bid at the wholesale fish auction each weekday at 6 a.m. Fresh seafood and smoked fish retailers do business until much later, or you can order the catch of the day for lunch at one of the market restaurants.
I jest but it's a fun little fish market run on a Dutch auction. While it doesn't rival Toyko or any of the other exemplars of globalized seafood it does present a great picture of what the fleet pulls out of local waters and the local economy. Elle is a great guide if you can get her.