Growth measurements are needed to monitor health and predict harvest time
Length : linear dimension using calipers or ruler - quick and easy
Wet weight : most common assessment of whole body growth of fishes - quick and easy
Dry weight : wet weight minus water (in oven at ≤100°C). Can usually be applied only on dead organism; it is most accurate method for assessing animal tissue growth, since changes in tissue water content may occur due to stress etc.
Condition factor : weight/(length) 3
Ash-free dry weight : dry weight – inorganic ash (up to 24 h at 500°C). It is the dry weight of organic matter in the animal. Useful for animals with large inorganic components (e.g., bivalves) where it is relatively difficult to measure organic tissue content. Sometimes simply expressed as ash weight .
Proximate composition : determination of different categories of compounds in tissues. Most commonly measured categories include carbohydrates, proteins, lipids.