A simple diagram of three growth patterns. When a small fish (T1) grows to the assumed length of the large fish (T2). If b = 3, then this species is isometric growth, that is, T1 has the same form and condition as T2. If b > 3, then this species is positive-allometric growth, that is, T2 increases in relative body thickness or plumpness more than T1. If b < 3, then this species is negative-allometric growth, that is, body shapes of T2 are changed to become more elongated.