Energy Allocation Strategies in Marine Fish Populations
Summary
Marine fish must balance the energetic demands of growth, maintenance, locomotion and reproduction within the constraints of resource availability and environmental variability. Energy allocation strategies determine how assimilated energy is partitioned between somatic reserves and reproductive effort, shaping individual fitness and population productivity. Tissue-level measurements of lipids, proteins and energy density reveal temporal patterns of reserve accumulation and mobilisation across life stages and seasons. Geographic comparisons show that migration distance, habitat quality and spawning phenology influence reliance on stored versus newly acquired energy. Phenotypic plasticity enables fish to adjust allocation in response to changing temperatures, food supply and salinity, but trade-offs between current reproduction and future growth or survival can arise. A mechanistic understanding of these trade-offs is vital for predicting species resilience under climate change, refining stock assessment frameworks and guiding fisheries management towards strategies that support long-term reproductive success.
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Energy Allocation Strategies in Marine Fish Populations publication trend
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Technical terms
Energy allocation strategy: The pattern by which fish distribute assimilated energy among maintenance, growth and reproduction.
Somatic energy stores: Energy reserves held in body tissues, predominantly lipids, supporting survival and future reproductive output.
Gonadosomatic index: A measure of reproductive investment, calculated as the ratio of gonad mass to total body mass.
Hepatosomatic index: A measure of energy reserves, calculated as the ratio of liver mass to body mass.
Triacylglycerol: The principal form of stored lipid in fish tissues, serving as a key source of metabolic energy.
References
- Overwinter Changes in the Lipid Profile of Young-of-the-Year Striped Bass (Morone saxatilis) in Freshwater Ponds. Biomolecules (2021).
- Overwintering survivorship and growth of young-of-the-year black sea bass Centropristis striata. PLOS ONE (2020).
- Regional differences in energy allocation of black sea bass (Centropristis striata) along the U.S. Northeast Shelf (36°N to 42°N) and throughout the spawning season. Journal of Fish Biology (2022).
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