Larval Development in Sea Urchin Aquaculture
Summary
Sea urchin aquaculture hinges on an intricate larval phase that encompasses fertilisation, embryogenesis, planktonic feeding and metamorphosis into benthic juveniles. Larvae begin as ciliated blastulae that progress through gastrulation to form echinopluteus stages equipped with bilateral arms for feeding on microalgal diets. The duration and success of this period depend on optimal physico-chemical conditions, sufficient microalgal supply and precise control of larval density. Competent larvae must recognise settlement cues—from biofilms, macroalgae or conditioned seawater—to trigger metamorphosis, a critical bottleneck in culture operations. Post-larvae then require specialised formulated feeds to sustain rapid skeletogenesis and organogenesis, achieving sizes that permit transfer to nursery and grow-out systems. Global research has focused on enhancing each developmental milestone to improve survival, uniformity and throughput, thereby mitigating pressure on wild stocks and unlocking the commercial potential of sea urchin roe production worldwide.
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Larval Development in Sea Urchin Aquaculture publication trend
The graph below shows the total number of articles in larval development in sea urchin aquaculture across all publications each year (not limited to Nature Index journals).
Technical terms
Echinopluteus larvae: Planktonic larval stage of sea urchins characterised by ciliated arms used in feeding and locomotion.
Competent larvae: Larvae that have completed development and are capable of settling and metamorphosing.
Settlement cues: Biological or chemical signals (e.g. biofilms, macroalgal exudates) that induce larvae to anchor and metamorphose.
Metamorphosis: Transformation process in which a free-swimming larva develops into a benthic juvenile form.
Post-larvae: Recently metamorphosed juveniles that require specialised feeds for further growth.
Biofilm: Surface-associated microbial community that can act as a settlement substrate for competent larvae.
Abiotic factors: Non-living environmental parameters such as temperature, salinity and photoperiod that influence larval development.
References
- Influence of physico-chemical parameters on the settlement of competent larvae of cultured sea urchin, Paracentrotus lividus. Aquaculture (2024).
- The influence of density on survival and larval development in the sea urchin Arbacia dufresnii (Echinodermata: Echinoidea). Revista de Biología Tropical (2021).
- Scale-Up of an Aquaculture Plant for Reproduction and Conservation of the Sea Urchin Paracentrotus lividus: Development of Post-Larval Feeds. Journal of Marine Science and Engineering (2023).
- Effects of Marine Microalgae on the Developmental Growth of the Sea Urchin Larviculture Anthocidaris crassipina. Fishes (2023).
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