Standard weight in fish
To determine a standard weight equation, several data sets or weight-length relationships representing a species across its range are used.Murphy et al. (1991) suggested that it is preferable that standard weight equations represent the entire geographical range of a species, and that they be used for comparison purposes rather than management targets.[4] Practically, weight-length equations are often developed for sub-populations from specific geographic areas, but these are different from standard weight relationships.Generally, fish that are heavier than the standard weight for their length are considered healthier, having more energy reserves for normal activities, growth and reproduction.For example, Simpkins et al. found that juvenile rainbow trout with a condition index of less than 80% were at a high risk of dying.[10] Fulton's condition factor, K, is another measure of an individual fish's health that uses standard weight.
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