Abstract
Energy compartmentalization in migrating and nonmigratingProchilodus mariae was monitored throughout the season of gonad maturation. Both migrating and nonmigrating individuals matured sexually. Rates of maturation were similar for migrating and nonmigrating individuals of both sexes. The overall caloric density of P. mariae at the beginning of the migrating season is among the highest densities reported for fishes (1.93 kcal g-' fresh weight). Nonmigrating females stored less energy in lipid deposits and devoted approximately five times as much energy to egg production when compared with migrating females.
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