Here is the link to the journal.
http://www.colszoo.org/internal/drum_croaker/pdf/2007.pdf
I believe it is on page 8.
The dosages given in the paper can be extrapolated out for smaller octopuses. Species such as
Octopus bimaculoides, and the like, may only require 25% of the concentration needed to euthanize GPOs, as the water temperature is greater which will induce a quicker uptake time. Smaller octopuses are many times euthanized via ethanol because the volume needed is much less than the larger octopuses (due to the large containers that these larger octopuses occupy). Please note the descriptions of the octopuses behavior during the trials. While it may appear that the animal is "suffering" its behavior is actually normal for this procedure. Many marine animals, especially fishes, will go through an excitement phase before they expire and while this may appear inhumane, it is merely a normal reaction occurring. Because benzocaine works as an anesthetic agent you can (from my observations) rest assure that the specimen is not in pain during the procedure.
The two GPOs used were both in senescence and were euthanized in a large garbage can off exhibit.
Sepia pharaonis and
Sepia officinalis were euthanized in a 4 L container off exhibit. These combined results will be published fairly soon as well as results for another cephalopod species (knock on wood).
The weight of the specimen is irrelevant when determining dosages for baths. Treatments via baths are dependent upon water volume while IV injections, and the like, are dependent upon weight. You are dosing the water with the benzocaine, or what have you, not the animal. Factors that may cloud this are temperature and pH but concentrations between different sized animals (given temperature and pH are the same) should be equal.
Greg