Decapod Larval Ecology in Marine Ecosystems

Decapod crustaceans encompass familiar groups such as prawns, crabs and lobsters, whose larval phases play critical roles in marine food webs, population connectivity and the sustainability of fisheries. Larvae typically pass through multiple planktonic stages—beginning with the protozoea and culminating in the megalopa—during which they undergo morphological and behavioural transformations that determine survival, dispersal and settlement success. Oceanographic processes such as currents, temperature stratification and mesoscale eddies govern the spatial distribution of larvae, influencing gene flow between populations and the replenishment of adult stocks. Environmental stressors including ocean warming, acidification and changing salinity regimes can alter larval physiology, development rates and mortality, with cascading effects on recruitment. Advances in high-resolution modelling, molecular identification and in situ tracking have begun to unravel the complex interplay between larval traits and physical drivers, revealing species-specific dispersal pathways and hotspots of retention. Such insights inform adaptive management of fisheries and conservation initiatives, as they highlight the mechanisms by which larval ecology shapes the resilience of decapod populations in a rapidly changing ocean.

Research from Nature Portfolio

A detailed morphological analysis has provided the first comprehensive description of the protozoea stage of two deep-sea shrimps, offering a new identification key based on antennular ornamentation. Specimens from the Northwestern Mediterranean Sea were confirmed by molecular markers, distinguishing larvae of a commercially harvested species from sympatric mesopelagic congeners. This work resolves long-standing misidentification issues and lays the groundwork for accurate field surveys, enabling finer estimates of larval distribution, population connectivity and the impact of deep-sea fisheries on recruitment dynamics.

Decapod Larval Ecology in Marine Ecosystems publication trend

The graph below shows the total number of articles in decapod larval ecology in marine ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Antennula: The first pair of sensory appendages on crustaceans, often bearing setae and ornamentation used in larval identification.

Biophysical model: A simulation framework coupling physical oceanographic data with biological traits to predict larval dispersal and survival.

Mesoscale eddy: A circular current feature, typically 10–100 km in diameter, that can retain or transport larval organisms across ocean basins.

Protozoea: The early naupliar-like larval stage following hatching, characterised by simple limb structure and planktonic behaviour.

Megalopa: The final planktonic stage in many decapods, exhibiting features of both larval and juvenile forms and preceding benthic settlement.

Population connectivity: The exchange of individuals among geographically separated populations, crucial for genetic diversity and stock sustainability.

References

1. Influence of Mozambique Channel eddies on larval loss of two shallow-water commercial shrimp species. PLOS Climate (2024).
2. Morphological description of the first protozoeal stage of the deep-sea shrimps Aristeus antennatus and Gennadas elegans, with a key. Scientific Reports (2020).
3. Morphological identification and molecular confirmation of the deep-sea blue and red shrimp Aristeus antennatus larvae. PeerJ (2019).
4. Seasonality of planktonic crustacean decapod larvae in the subtropical waters of Gran Canaria Island, NE Atlantic. Scientia Marina (2018).