The overall measurement of a fish, whether it
is fork-tailed or round tailed, is taken from the snout on
the upper jaw to the end of the tail.
Abalone are measured along a straight line at
the widest point of the shell.
Crabs, except spanner crabs, are measured along
the body from the notch between the two most protruding frontal
teeth to the centre of the posterior margin of the carapace
or shell.
Spanner crabs are measured along the body from
the base of the orbital notch (eye socket) to the centre of
the posterior margin of the carapace.
Rock Lobsters (crayfish) are measured along the
length of the carapace or head, along a straight line from
the point of the union of the second antennae or large feelers
to the centre of the posterior margin of the carapace or head,
ignoring any attached hairs.
Murray Crayfish are measured from the rear of
the eye socket to the centre middle of the carapace.