Population Dynamics and Life History Traits of Marine Fish

Marine fish populations are regulated by a complex interplay of processes including growth, mortality, reproduction and recruitment. Life history traits such as age and size at maturity, longevity, fecundity and spawning strategy underpin how a species allocates energy to survival versus reproduction. Growth is often described by models such as the von Bertalanffy growth function, while mortality may be partitioned into natural and fishing components. Recruitment—the number of young entering the exploitable population—depends on the availability of suitable nursery habitats, larval survival and environmental conditions. Variability in these parameters shapes cohort strength, drives fluctuations in biomass and alters resilience to exploitation and environmental change. In many species, iteroparity (multiple spawning events) and determinate or indeterminate fecundity interact with physiological indices such as the gonadosomatic index to influence seasonal and annual reproductive output. Spatial heterogeneity in habitat suitability and temperature regimes further affect growth rates, maturation schedules and migration patterns. Understanding these dynamics is central to sustainable fisheries management, conservation of biodiversity and prediction of population responses to climate change and anthropogenic pressures.

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Population Dynamics and Life History Traits of Marine Fish publication trend

The graph below shows the total number of articles in population dynamics and life history traits of marine fish across all publications each year (not limited to Nature Index journals).

Technical terms

Recruitment: The number of individuals that survive to join the fishable or breeding population.

Fecundity: The potential reproductive capacity of an individual, usually expressed as the number of eggs produced.

Gonadosomatic index (GSI): The ratio of gonad weight to total body weight, used as an indicator of reproductive investment.

Iteroparous: A reproductive strategy in which an organism spawns multiple times during its life.

Semelparous: A reproductive strategy in which an organism spawns once and then dies.

Von Bertalanffy growth function: A widely used model describing length or weight increase over time in fish.

References

1. Fish species lifespan prediction from promoter cytosine‐phosphate‐guanine density. Molecular Ecology Resources (2023).
2. Spatio-temporal patterns in juvenile habitat for 13 groundfishes in the California Current Ecosystem. PLOS ONE (2020).
3. Trends in predicted age at maturity of Sablefish from 22 years of surveys. Marine and Coastal Fisheries (2024).