Follow the schedule with the animals in small separate tubes or dishes.
    Many nudibranchs lose all their colour on preservation and you will not be able to separate them easily if you mix them up.

  1. Narcotise in 1 : 1 mixture of sea-water and 7% Magnesium Chloride solution for 2-8 hours, until animal no longer responds to poking.
  2. Leave to stand in 10% Formalin or Bouin's Fixative for 24 hours, shaking occasionally. Beware these fixatives are dangerous chemicals and should be used in a fume cupboard or in the open air.
  3. Wash in tap water for 1 day - shake occasionally.
  4. Store in 70% Alcohol with label.