Fecundity Dynamics in Marine Fish Populations

Fecundity dynamics in marine fish populations encompass the patterns and processes by which egg production varies among species, populations and environments. Maternal traits such as body size, age and condition often shape the total and relative number of eggs produced, with larger and older females contributing disproportionately to reproductive output through hyperallometric scaling. Environmental drivers including temperature, latitude and resource availability further influence egg size, batch timing and developmental duration, affecting larval survival and recruitment success. Maternal effects extend to physiological processes such as vitellogenesis and hormone profiles, while context-dependent strategies may modulate reproductive investment across seasons. Climate change and fishing pressure are reshaping life histories, favouring earlier maturation, smaller body sizes and altered age structures that can undermine stock resilience. Integrating life history optimisation models with demographic and physiological data has improved projections of how warming oceans will shift reproductive schedules. Concurrently, management is moving beyond aggregate biomass measures towards age- and size-structured reference points, emphasising the protection of older, larger individuals to sustain egg production, biodiversity and global seafood security.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Fecundity Dynamics in Marine Fish Populations publication trend

The graph below shows the total number of articles in fecundity dynamics in marine fish populations across all publications each year (not limited to Nature Index journals).

Technical terms

Fecundity: The total number of eggs produced by a female fish during a given reproductive period.

Relative fecundity: The number of eggs produced per unit of female body weight.

Spawning stock biomass: The total weight of all mature individuals capable of reproduction in a fish population.

Hyperallometry: A scaling relationship in which reproductive output increases disproportionately with body size.

Vitellogenesis: The yolk deposition phase of oocyte development during egg formation.

Age-based indicator ABI MSY: A metric comparing observed age composition to the age structure expected at maximum sustainable yield.

References

1. Life history optimisation drives latitudinal gradients and responses to global change in marine fishes. PLOS Biology (2023).
2. Including older fish in fisheries management: A new age‐based indicator and reference point for exploited fish stocks. Fish and Fisheries (2023).
3. Investigating temporal variability and influence of condition on fecundity and spawning of spotted wolffish (Anarhichas minor) in Icelandic waters. Polar Biology (2024).