The proportion depends on what you're planning on doing with the hemolymph. We've used 1:1 and 1:5 (one part hemolymph, 5 parts anticoagulant). There are a number of different anticoagulants that people use. You could post your question on [email protected] to get more responses. You have to be a member of crust-l to post to it, but membership is free.