Aquaculture, the practice of farming aquatic organisms, is typically confined to inshore environments such as protected bays, estuaries, and man-made ponds. These locations allow easier management and shelter from storm damage but come with significant drawbacks, including competition from other coastal users and water quality issues that can negatively impact productivity. Munroe’s team sought to challenge these limitations by extending clam farming into the harsher, open ocean environment, where cleaner water and expansive space may offer enhanced growth potential and fewer conflicts with human activities.

Surfclams, large bivalves known for their robust shells and prominent role in commercial seafood markets, have traditionally been harvested from wild stocks. They burrow into sandy marine substrates and provide a key ingredient in various culinary dishes, including chowders and fried clam strips. This study hypothesized that juvenile surfclams could thrive in offshore cages designed to protect them from predators while providing optimal conditions for growth and survival in the dynamic oceanic environment.

The experimental design involved deploying more than 300,000 juvenile surfclams into custom-engineered cages located miles offshore along the New Jersey coast. These cages featured innovative construction aimed at mitigating predation and sediment intrusion—two significant challenges in clam farming. By elevating clams off the ocean floor, the cages allowed a continuous flow of cleaner water, reducing sand buildup inside the clams’ shells and improving meat quality for consumption.

Throughout the year-long study, the team monitored clam growth and survival rates across spring and fall seasons, with detailed assessments of environmental factors such as wave action, sedimentation, and temperature. Notably, clams introduced in spring exhibited more rapid growth rates and higher survivorship than those placed in the fall. This seasonal variation was attributed to calmer sea conditions and fewer storms during spring, which facilitated easier maintenance and monitoring of the farming equipment.

The findings have important implications for both the aquaculture industry and environmental stewardship. Avoiding crowded coastal zones reduces conflicts with other marine users and may minimize the ecological footprint often associated with nearshore aquaculture. Additionally, the research demonstrated that clams grown offshore had minimal grit in their meat—a common complaint affecting clam palatability. This suggests that offshore aquaculture could produce superior quality seafood that appeals to high-end markets.

Equally significant is the durability of the cages themselves. The harsh offshore environment with its strong waves and frequent storms demands resilient aquaculture infrastructure. Munroe’s team engineered cages capable of withstanding these conditions without damage, underscoring the viability of sustained offshore clam farming over longer timeframes. This technological advancement addresses one of the critical operational hurdles that have limited expansion of aquaculture into open ocean waters.

This study was conducted in close collaboration with commercial fishing enterprises and supported by funding from the National Oceanic and Atmospheric Administration (NOAA). Working directly with industry partners ensured that the research addressed practical challenges and real-world conditions, accelerating the translation of scientific discoveries into scalable business models. The collaboration highlights the importance of integrating academic research with commercial expertise to innovate within the seafood sector.

Looking ahead, while the results are encouraging, Munroe emphasizes the necessity of overcoming remaining regulatory and logistical barriers. Navigating the complex permitting processes for offshore aquaculture and ensuring long-term equipment durability remain essential priorities. Nevertheless, the research presents a compelling case for expanding ocean farming as a sustainable strategy to bolster local economies, increase seafood supply, and reduce pressure on wild clam populations.

The Rutgers-led project adds a vital piece to the evolving puzzle of sustainable ocean resource utilization. By demonstrating the feasibility and benefits of offshore clam farming, the study opens new avenues for aquaculture innovation that align with environmental conservation goals. It fosters optimism that seafood production can evolve beyond traditional practices and scale in a responsible manner that supports coastal communities and ecosystems alike.

In their efforts, the researchers have set a precedent for integrating ecological understanding with engineering solutions to address key aquaculture challenges. Future work will likely focus on optimizing cage designs, refining seasonal deployment strategies, and expanding to other species with similar ecological niches. The long-term vision is an offshore aquaculture industry that is productive, resilient, and harmonious with marine environments.

According to Munroe, the success of offshore surfclam farming exemplifies a new frontier where science meets industry to produce tangible benefits. “We’re excited to show that this is not only possible but can be done in a way that protects the environment and creates jobs,” she said. This innovation could represent a paradigm shift in how seafood is farmed, with implications extending well beyond New Jersey’s waters.

The research team contributing to this milestone includes Laura Steeves, formerly a postdoctoral researcher at the Rutgers Haskin Shellfish Research Laboratory and now affiliated with the Flødevigen Research Station in Norway, fisheries researcher Sarah Borsetti, and doctoral student Rachel Davitt, all of whom played integral roles in the experimental setup, monitoring, and data analysis.

As global seafood demands intensify amid environmental concerns over wild fisheries, the potential for offshore aquaculture to deliver sustainable, high-quality shellfish is garnering increasing attention. Rutgers University’s breakthrough in Atlantic surfclam culture may well inspire similar initiatives along other coastlines eager to balance economic development with marine conservation.

Subject of Research: Animals
Article Title: Offshore aquaculture of Atlantic surfclams Spisula solidissima: Growth, survival and feasibility
News Publication Date: 12-Feb-2026
Web References: 10.1093/naaqua/vraf038
Image Credits: Sarah Borsetti/Rutgers University
Keywords: Fisheries, Marine biology

Aquaculture, while poised to meet the nutritional needs of growing populations, confronts challenges such as disease outbreaks and reliance on chemical antibiotics, which risk fostering resistant pathogens and disturbing aquatic ecosystems. Addressing these issues, Professor Jian Qin from Flinders University highlights the urgent need to innovate feed formulations that can enhance fish immunity without compromising marine biodiversity. By integrating herbal extracts known for their medicinal properties, researchers aim to promote fish health during vulnerable developmental phases, especially the juvenile stage when barramundi are most susceptible to infections.

The study focused on four distinct plant species: gallnuts (Rhus chinensis), green chiretta (Andrographis paniculata), white mustard (Sinapis alba), and betel nut (Areca catechu). Each of these botanicals contains bioactive compounds such as phenols, terpenoids, alkaloids, and organosulfides, which are well-documented for their antimicrobial and antiparasitic effects. These natural substances offer a promising alternative to conventional antibiotics, potentially mitigating chemical residues in farmed fish and limiting environmental contamination.

However, while the benefits of these extracts in bolstering fish immune responses were evident, the interdisciplinary team led by Flinders PhD candidate Zhengyi Fu adopted a rigorous approach to assess their environmental safety. Experimental trials extended beyond juvenile barramundi to include brine shrimps (Artemia salina) and other marine species commonly found in aquaculture environments. This holistic evaluation aimed to elucidate any adverse physiological or toxicological effects that could ripple through the aquatic food web, thereby ensuring that the adoption of herbal additives does not inadvertently jeopardize ecosystem integrity.

The resulting data revealed nuanced interactions. Although most plant extracts demonstrated low ecotoxicity and contributed positively to biochemical markers indicative of immune health in juvenile fish, caution remains warranted. Some bioactive chemicals exhibited potential toxicity under certain exposure conditions, underscoring the complexity of deploying botanical compounds in dynamic marine settings. These findings prompt a critical reevaluation of feed additive concentrations and formulations to optimize benefits while minimizing ecological risks.

Professor Zhenhua Ma, director of the Tropical Fisheries Research and Development Centre in South China Sea Fisheries Research Institute, emphasized the dual responsibility of aquaculture innovation. “While plant extracts present exciting opportunities as sustainable feed additives, we must remain vigilant about their broader environmental impacts,” he stated. This sentiment echoes a growing consensus among marine scientists advocating for integrated risk assessments that holistically consider aquatic organism health, environmental persistence of bioactive substances, and the cumulative effects on biodiversity.

The methodology employed combined controlled laboratory experiments with biochemical assays measuring immune-related parameters, such as lysozyme activity, superoxide dismutase levels, and total antioxidant capacity in juvenile barramundi. These markers serve as reliable indicators of enhanced immunocompetence, reflecting improved resistance to pathogenic challenges. Concurrently, toxicological effects on non-target organisms were assessed through mortality rates, behavioral observations, and physiological stress responses, ensuring a comprehensive understanding of additive safety.

Publication in the prestigious journal Ecological Indicators signifies the study’s contribution to the field of aquaculture ecology and environmental monitoring. By bridging immunology, toxicology, and sustainable agriculture, the research embodies an integrative framework essential for future aquaculture innovations. The article titled “Evaluation of plant extracts as aquaculture feed additives: Ecotoxicological and physiological responses in marine species” advances critical knowledge, guiding policymakers, feed manufacturers, and aquatic farmers toward more informed decisions.

An important aspect of this research lies in its commitment to antibiotic-free aquaculture production, a global priority given rising concerns over antimicrobial resistance (AMR). Herbal extracts serve as viable immunostimulants, promoting innate defense mechanisms in fish without resorting to drugs that may compromise public health. Furthermore, enhancing the resilience of farmed species like barramundi aids in reducing disease outbreaks, which often precipitate the excessive use of chemical treatments detrimental to surrounding environments.

The broader ecological context must be considered. As aquaculture expands, the discharge of feed additives and their metabolites into marine habitats demands careful scrutiny. Even low concentrations of bioactive plant compounds can modulate microbial communities, alter benthic organisms, and trigger unforeseen ecosystem shifts. Hence, the ongoing research led by Flinders University and its Chinese partners represents a foundational step toward balancing aquaculture’s productivity with marine ecosystem conservation.

Beyond the immediate findings, this study prompts future investigations into the synergistic effects of multi-plant extract formulations and long-term exposure outcomes across diverse marine species. It invites exploration into optimized extraction methods, dosage regimens, and delivery mechanisms tailored to various aquaculture species and environmental conditions. Ultimately, this line of research could revolutionize feed practices, fostering resilience and sustainability.

In conclusion, the emerging application of herbal additives in barramundi aquaculture stands at the intersection of tradition and modern science—leveraging ancient botanical wisdom through contemporary experimental rigor. While preliminary results are encouraging for fish health and sustainable farming, thorough environmental risk evaluations remain indispensable. Together, these insights offer a pathway toward a sustainable aquaculture paradigm that simultaneously champions food security, ecological integrity, and a reduced chemical footprint.

Subject of Research: Animals

Article Title: Evaluation of plant extracts as aquaculture feed additives: Ecotoxicological and physiological responses in marine species

News Publication Date: 30-Jul-2025

Web References:
https://doi.org/10.1016/j.ecolind.2025.113964
https://www.sciencedirect.com/science/article/pii/S1470160X25008945

References:
Fu, Z., Zhang, T., Ma, Z., & Qin, J.G. (2025). Evaluation of plant extracts as aquaculture feed additives: Ecotoxicological and physiological responses in marine species. Ecological Indicators. DOI: 10.1016/j.ecolind.2025.113964

Image Credits: Flinders University

Keywords: aquaculture, barramundi, herbal additives, plant extracts, immunostimulants, ecotoxicology, antibiotic-free farming, sustainable aquaculture, Rhus chinensis, Andrographis paniculata, Sinapis alba, Areca catechu, marine species, fish immunity

Drying seafood, particularly small fish like anchovies, is a critical preservation step that extends shelf life, simplifies storage, and maintains nutritional value for extended periods. Traditionally, drying methods have relied on sun drying or constant microwave power application, both of which present notable limitations. Sun drying, while cost-effective, is weather-dependent and time-consuming, leaving products vulnerable to microbial contamination. On the other hand, applying constant microwave power risks uneven drying, heat damage, or undesirable textural changes due to abrupt moisture loss. The step-down microwave drying technique masterfully addresses these drawbacks by progressively lowering microwave power throughout the drying process, ensuring a more uniform heat distribution and gentle moisture evaporation environment.

Anchovies, a highly perishable yet economically important small pelagic fish species, have long challenged food technologists seeking efficient drying solutions. Their delicate muscle structure and high water content render them susceptible to overprocessing artifacts such as case hardening, discoloration, and nutrient degradation. The step-down technique innovatively applies a higher initial microwave power to rapidly reduce surface moisture, followed by sequentially reduced power levels to allow moisture migration from the core to the surface without causing structural damage. This dynamic adjustment harmonizes internal moisture dynamics with surface drying rates, preserving the anchovy’s organoleptic qualities, including texture, flavor, and color.

Experimental evaluation of the step-down microwave drying process revealed prominent improvements over conventional drying methods. Quantitative analysis demonstrated significantly reduced overall drying time, often shortened by up to 30%, while simultaneously curbing energy consumption. These gains are attributed not only to the microwave’s intrinsic rapid heating capabilities but also to the carefully calibrated power decrease sequence tailored to the fish’s moisture profile during dehydration. The research team’s meticulous optimization of power step intervals and temperature thresholds exemplifies the precision engineering essential for industrial adoption.

Beyond efficiency metrics, the sensory quality of stepped-down microwave-dried anchovies exhibited remarkable enhancement. Sensory panels consistently favored products dried via this method for their balanced chewiness, retained marine aroma, and appealing golden-brown hue. This contrasts with samples dried under constant microwave power or sun drying, which often suffer from rubbery texture, burnt spots, or faded coloration. These sensory advantages likely stem from the method’s mitigation of thermal stress and prevention of rapid case hardening, facilitating better retention of volatile flavor compounds and structural proteins.

From a nutritional standpoint, the step-down microwave drying technique shows promising benefits in preserving essential nutrients. Key analytes such as omega-3 fatty acids, essential amino acids, and vitamins demonstrated minimal degradation when compared to traditional methods. The controlled thermal environment significantly reduces oxidative reactions and thermal denaturation that typically compromise nutrient integrity during drying. Such preservation is critical for delivering health benefits to consumers and maintaining the functional food status of dried anchovy products.

The practical implications of this research reach far beyond academic curiosity, potentially transforming processing lines for seafood producers worldwide. Reduced drying times and energy requirements directly translate to increased throughput and lowered operational costs, improving profitability and sustainability. Furthermore, enhanced product quality can expand market access by satisfying stringent quality standards imposed by international regulators and demanding consumers seeking premium dried seafood offerings. Integration with existing microwave drying infrastructure could be achieved with minimal retrofitting by incorporating advanced power control systems.

Environmental considerations also underscore the attractiveness of step-down microwave drying. Given the mounting global emphasis on energy efficiency and carbon footprint reduction, drying techniques that reduce energy consumption without sacrificing product quality garner significant interest. The step-down approach exemplifies a smart process intensification, aligning with sustainable manufacturing principles by optimizing resource use and minimizing waste generation. As a result, seafood processors adopting this method can simultaneously serve commercial interests and environmental stewardship goals.

At a fundamental level, the success of the step-down microwave technique illustrates the power of harnessing controlled variable input in food process engineering. The nuanced understanding of how microwave energy interacts with the complex matrix of fish muscle tissue informs more intelligent design of drying protocols. This approach transcends anchovies alone, bearing potential applicability to a diverse array of seafood and meat products where moisture content and thermal sensitivity are critical quality parameters. Thus, the research harbors broad potential to catalyze innovation across the food drying sector.

Despite the promising results, the researchers note that further refinement and scale-up studies remain essential before widespread commercial implementation. Factors such as microwave cavity design, sample loading arrangements, and batch versus continuous processing modes require detailed exploration to ensure consistency and reproducibility at industrial scales. Additionally, cost-benefit analyses factoring capital investments against long-term savings will guide stakeholders’ adoption decisions. Nonetheless, the scientific foundation laid by this work constitutes a formidable stepping stone.

Consumer trends favoring minimally processed, high-quality protein sources position dried anchovies as attractive health snacks and culinary ingredients. The step-down microwave drying technique aligns well with these market dynamics by delivering products that retain nutritional richness and sensory appeal. Moreover, the method’s versatility invites further research into customized drying protocols to tailor product attributes for diverse consumer preferences or specialty food segments. This adaptability strengthens competitive advantage in the evolving global food landscape.

Intriguingly, the successful demonstration of the step-down microwave drying approach stimulates cross-disciplinary dialogues between food scientists, engineers, and industry stakeholders. Collaborative advances in microwave power modulation technology, sensors for real-time moisture monitoring, and computational drying models promise to refine process control strategies. Embracing digitalization and automation alongside this technique could unlock unprecedented precision in drying operations, fostering a new era of smart food manufacturing.

Moreover, broader adoption of such innovative drying methods contributes incrementally toward global food security by extending shelf life and reducing post-harvest losses of perishable seafood commodities. In many developing countries where anchovy consumption is high and cold chain infrastructure limited, improved drying affords safer and longer-lasting protein sources. Thus, technical advancements reported resonate beyond commercial profit, supporting nutritional well-being in vulnerable populations.

In summary, the step-down microwave drying technique represents a compelling advancement in seafood processing technology, merging efficiency, quality preservation, and sustainability. By expertly adjusting microwave energy inputs through the drying cycle, the method resolves key challenges inherent in traditional drying, offering a strategic tool for modern food manufacturing. As research matures and technology integrates into commercial practice, consumers can anticipate better-tasting, more nutritious dried anchovies arriving on global markets, signaling a new standard in value-added seafood products.

Subject of Research: Anchovy drying using step-down microwave technique

Article Title: Anchovy drying using step-down microwave technique

Article References:
Paengkanya, S., Nathakaranakule, A. Anchovy drying using step-down microwave technique. Food Sci Biotechnol (2025). https://doi.org/10.1007/s10068-025-01939-3

Image Credits: AI Generated

DOI: https://doi.org/10.1007/s10068-025-01939-3