Demographic and Reproductive Ecology of Tropical Marine Fishes

The demographic and reproductive ecology of tropical marine fishes examines how life-history traits—such as growth rate, age at maturity, longevity, mortality and fecundity—vary across spatial and environmental gradients in the world’s warm-water oceans. Tropical regions harbour exceptional fish biodiversity, but many populations remain data-poor. Ageing techniques (for example, otolith analysis), length-frequency sampling and mark–recapture studies yield estimates of vital rates that underpin stock assessments and conservation planning. Reproductive strategies range from batch spawning and seasonal pulses to protogynous or protandrous hermaphroditism, with gonochoristic systems also widespread. The timing and intensity of reproduction are shaped by temperature, photoperiod, food availability and habitat complexity. Life-history trade-offs between growth and reproduction determine resilience to fishing and environmental change. Integrating genomic, ecological and oceanographic approaches is elucidating mechanisms that drive variation in demography and reproductive output, informing adaptive management to ensure global food security and ecosystem stability.

Research from Nature Portfolio

Comparative genome sequencing of two roughy species has shed light on the molecular basis of their contrasting longevities. By assembling de novo genomes and analysing over 400 candidate genes, researchers identified variants linked to enhanced genomic maintenance, modified autophagy pathways and altered intercellular communication in the long-lived species. These discoveries reveal how deep-water adaptations may incidentally extend lifespan and influence population turnover rates. Insights into the genetic control of ageing provide a novel dimension to demographic modelling and support management of vulnerable, slow-growing taxa.

Demographic and Reproductive Ecology of Tropical Marine Fishes publication trend

The graph below shows the total number of articles in demographic and reproductive ecology of tropical marine fishes across all publications each year (not limited to Nature Index journals).

Technical terms

Demographic parameters: Quantitative measures of population structure and dynamics, including age, size, mortality and recruitment.

Length-at-maturity (L50): Fork length at which 50% of individuals are sexually mature.

Gonadosomatic index (GSI): Ratio of gonad weight to total body weight, used to assess reproductive effort.

Batch fecundity: Number of eggs produced in a single spawning event.

Gonochoristic: Species in which individuals are either male or female for their entire life.

Von Bertalanffy growth function: Mathematical model describing growth in length over time towards an asymptotic maximum.

References

1. Insights into aging mechanisms from comparative genomics in orange and silver roughies. Scientific Reports (2024).
2. Effects of data sources and biological criteria on length-at-maturity estimates and spawning periodicity of the commercially important Hawaiian snapper, Etelis coruscans. Frontiers in Marine Science (2023).
3. Small-scale fishing has affected abundance and size distributions of deepwater snappers and groupers in the MesoAmerican region. Reviews in Fish Biology and Fisheries (2023).
4. Reproductive features of data-deficient yellowfin snapper, Lutjanus xanthopinnis (Actinopterygii: Eupercaria: Lutjanidae), from east-coast of Peninsular Malaysia: Implications for sustainable fisheries management. Acta Ichthyologica Et Piscatoria (2024).