Evaluation of carbon transfer efficiency from microalgae to Litopenaeus vannamei larvae using a laboratory scale rearing system

The increasing scrutiny of aquaculture’s environmental impact has spurred a necessary focus on biological carbon flows within production systems. Traditionally, carbon footprint assessments have often overlooked the intricate interplay of photosynthetic organisms like microalgae and the higher trophic levels they support. This recent study, evaluating carbon transfer efficiency from *Chaetoceros gracilis* to *Litopenaeus vannamei* larvae, represents a crucial step toward a more comprehensive understanding. It builds upon previous research exploring natural reproductive modulators in aquaculture Natural reproductive modulators in aquaculture: endocrine mechanisms, microalgal and plant-derived bioactives, and sustainability perspectives, demonstrating a growing interest in harnessing biological processes to enhance sustainability within the sector. The meticulous quantification of carbon transfer, coupled with extrapolation to global production statistics, provides a vital data point for refining carbon footprint calculations and promoting more responsible aquaculture practices.

The researchers’ findings – a carbon transfer efficiency of up to 33.0% at a specific algal density and an estimated 9.2 tons of carbon retained annually in *L. vannamei* hatchery seed production – are significant not only for their numerical value but also for the methodology employed. Establishing a laboratory-scale rearing system allows for controlled observation and measurement of a process that is often obscured by the complexities of larger-scale operations. This work complements other investigations into the nutritional aspects of alternative feed sources for shrimp, such as the examination of *Clostridium autoethanogenum* protein Threshold-dependent effects of Clostridium autoethanogenum protein as the primary dietary protein source on growth, metabolism, and gut microbiota in Litopenaeus vannamei, highlighting the ongoing effort to optimize feed efficiency and minimize environmental impact. Understanding the dynamics of microbial communities within aquaculture systems A comparative observational study of prokaryotic microbial community dynamics across different Litopenaeus vannamei cultivation systems is also crucial, as these communities can influence nutrient cycling and overall carbon retention.

The implications of this research extend beyond simple carbon accounting. By demonstrating the measurable contribution of microalgae to carbon retention in *L. vannamei* aquaculture, the study strengthens the argument for integrating these photosynthetic organisms into feed strategies. This integration has the potential to not only reduce the carbon footprint of shrimp production but also to enhance larval survival and growth rates, further improving the overall efficiency of hatcheries. The validated methodology presented here provides a framework for future research examining the impact of different microalgae species, rearing conditions, and feeding regimes on carbon transfer efficiency. The careful calibration of these parameters is essential for optimizing biological carbon flows within aquaculture systems and ultimately contributing to more sustainable food production.

Looking ahead, the quantification of carbon transfer efficiency represents a critical building block for developing predictive models of carbon sequestration within aquaculture. A key question remains: how can we scale up these laboratory findings to real-world aquaculture operations while maintaining accuracy and accounting for the inherent variability of natural environments? Further research should focus on longitudinal studies that track carbon flows throughout the entire shrimp production cycle, from hatchery to grow-out ponds, to fully capture the impact of microalgae-mediated carbon retention. The integration of ocean intelligence and real-time data will be paramount to achieving this goal, paving the way for a future where aquaculture contributes positively to global climate mitigation efforts.