Length and Weight
As rainbow trout grow, they lengthen and increase in mass. The relationship between length and mass is not linear. The relationship between total length (L, in inches) and total mass (W, in pounds) for steelhead and nearly all other fish can be expressed by an equation of the form:
To convert from W to L use:
The factor b is close to 3.0 for all species, and c is a constant that varies among species. For lentic rainbow trout, b = 2.990 and c = 0.000426, and for lotic rainbow trout, b = 3.024 and c = 0.000370. In metric units for L in cm and W in grams, use c=0.0119 for lentic and c=0.0100 for lotic. The largest recorded rainbow trout can measure 120 cm (47 in) long and weigh 24 kg (53 lb).
The relationship described in this section suggests a 13 in (33 cm) lentic rainbow trout weighs about 1.0 lb (0.45 kg), while an 18 in (46 cm) lentic rainbow trout weighs about 2.5 lb (1.1 kg).
Read more about this topic: Rainbow Trout
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