A flake is the sailor's term for a turn in an ordinary coil, or for a complete tier in a flat coil, as a French or Flemish flake. The current dictionary form of the word is fake, a word that I have never heard used with this meaning.
A Flemish flake is a spiral coil of one layer only.
Larger shark received about 10%/kg less than those in the 4-6 kg range. Most of the Victorian landed product is wholesaled as carcasses on the Melbourne Fish Market where it is sold to fish and chip shops, the retail sector and through restaurants as 'flake'.
2007, Archie Gerzee, WOW! Tales of a Larrikin Adventurer, page 141:
The local fish shop sold a bit of flake (shark) but most people were too spoiled to eat shark. The main item on the Kiwi table was still snapper, and there was plenty of them, caught by the Kiwis themselves, so no shortage whatsoever.
2007, Lyall Robert Ford, 101 ways to Improve Your Health, page 45:
Until recently, deep-sea fish were considered to have insignificant levels of mercury but even these now contain higher levels than they used to, so you should also avoid the big fish like tuna, swordfish, and flake (shark) that are highest up the food chain.