Physiological Ecology of Pelagic Fish Populations

Physiological ecology of pelagic fish populations examines how internal processes shape the distribution, behaviour and demographic dynamics of fishes in the open ocean. Central themes include energy budgets, metabolic adaptations to temperature and oxygen variability, sensory mechanisms driving prey detection, and reproductive physiology underpinning spawning migrations. Pelagic species navigate thermal gradients, oxygen minimum zones and patchy prey fields, requiring precise physiological tolerances. Advances in bio‐logging and satellite tagging have revealed ontogenetic shifts in vertical and horizontal habitat use and enabled bioenergetic modelling that links measured metabolic rates to growth, survival and distribution under environmental change. By integrating mechanistic physiological data with ecosystem models, researchers are developing predictive frameworks to assess resilience to climate‐driven habitat shifts and to guide adaptive management of commercially and ecologically important pelagic stocks.

Research from Nature Portfolio

Recent studies have harnessed animal‐borne sensors to quantify energetics and spawning habitat use in highly mobile predators. High‐resolution bio‐logging of solitary sailfish has provided the first in situ estimates of active metabolic rates during free‐roaming foraging events, revealing median energy expenditures and net gains consistent with an energy‐speculator model. These findings clarify the balance between cost of pursuit and prey capture in individual foraging strategies. Complementary research combining larval sampling with coupled physical‐biological modelling has demonstrated that large marine protected areas can serve as effective spawning grounds for multiple tuna species, sustaining larval output even under varying current regimes and climatic states. Together, these works illustrate how direct physiological measurement and mechanistic modelling inform population‐level processes critical for conservation and management.

Physiological Ecology of Pelagic Fish Populations publication trend

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

Technical terms

Pelagic zone: The open‐ocean water column habitat, away from the coast and sea floor, where many migratory fishes roam.

Bio-logging: The use of animal-attached sensors to record physiological, behavioural and environmental data over time.

Active metabolic rate: The rate of energy expenditure by an organism during activity, often quantified via oxygen consumption per unit mass.

Conservation physiology: An interdisciplinary field linking physiological responses of organisms to environmental stressors and management outcomes.

Dissolved oxygen saturation: The percentage of oxygen present in water relative to its maximum solubility at a given temperature and pressure.

References

1. Hunting behavior of a solitary sailfish Istiophorus platypterus and estimated energy gain after prey capture. Scientific Reports (2023).
2. Evidence and patterns of tuna spawning inside a large no-take Marine Protected Area. Scientific Reports (2019).
3. Fisheries conservation on the high seas: linking conservation physiology and fisheries ecology for the management of large pelagic fishes. Conservation Physiology (2016).
4. First autonomous recording of in situ dissolved oxygen from free-ranging fish. Animal Biotelemetry (2015).
5. Widespread habitat loss and redistribution of marine top predators in a changing ocean. Science Advances (2023).