The emulsion is potent in flavour, and more than enough to accompany 4 fish servings. A little goes a long way. Unless you're planning to prepare 4 servings, store unused emulsion in a sealed glass container and keep refrigerated - it will keep for at least 7 days.
Metric kitchen scales are an inexpensive yet invaluable gadget to ensure accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use.