Abstract
Summary The aim of this study is to analyze individual growth of the freshwater prawn Macrobrachium borellii (Crustacea, Decapoda, Palaemonidae) analyzing pre- and postmolt cephalothorax length data in laboratory-reared animals. An isometric increase of Cl was observed in juveniles (slope: 1.01) and a negative allometric for females and males (slope: 0.85 and 0.87, respectively). The duration of intermolt period increases with the size, being linear in juveniles and positively exponential in both sexes. The size increase was larger in males than in females but there was no significant difference. The relationship between growth rate and intermolt period was negatively exponential in all of the groups. Growth by molting decreases with the size in a negatively exponential form. Values for males and females were not statistically different, but juvenile and adult values were. The juvenile phase is marked by a change in the growth level and may be due to the puberty molt. The difference in the male-female allometric level was relatively small and in some cases of uncertain significance.
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