What question did this study set out to answer?

The aim is to understand the link between aerobic metabolic scope, growth, and sexual maturation in fish under changing environments.

Growth, body size and sexual maturation are linked with the ontogenetic development of aerobic metabolic scope in fish

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Randomized trial quantifies metabolic scaling and maturation timing in Trinidadian guppies, suggesting reallocation of energy for reproduction.

The aim is to understand the link between aerobic metabolic scope, growth, and sexual maturation in fish under changing environments.
Longitudinal study of 53 Trinidadian guppies (Poecilia reticulata) from birth to adulthood
Measurements of standard metabolic rate (SMR) and maximum metabolic rate (MMR)
Analysis of growth trajectories and timing of sexual maturation for males.
FAS (factorial aerobic scope) declined through ontogeny, correlating with reduced body size at sexual maturation.
Males matured smaller and at an older age when experiencing the steepest declines in FAS.
High FAS retained at male maturation contradicts the idea of oxygen limitation driving maturation.

Andreassen et al. (2026) studied this question.

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Randomized trial quantifies metabolic scaling and maturation timing in Trinidadian guppies, suggesting reallocation of energy for reproduction.