Home Children's Health Bare clams – tomorrow’s reply for a extra sustainable meals supply?

Bare clams – tomorrow’s reply for a extra sustainable meals supply?

Bare clams – tomorrow’s reply for a extra sustainable meals supply?


In a analysis examine revealed in Sustainable Agriculture, researchers evaluated teredinids as a probably nutritious and sustainable future meals supply. They developed a pilot aquaculture system for these colloquially named ‘bare clams’ and elucidated their dietary worth when in comparison with typical ‘blue meals’ corresponding to blue mussels. Their findings reveal that bare clams are wealthy in helpful vitamins, together with monounsaturated fatty acids and vitamin B12, whereas containing protein content material akin to the blue mussels.

Study: Naked Clams to open a new sector in sustainable nutritious food production. Image Credit: Andreea Photographer/Shutterstock.com
Research: Bare Clams to open a brand new sector in sustainable nutritious meals manufacturing. Picture Credit score: Andreea Photographer/Shutterstock.com

Encouragingly, tailor-made microencapsulated algal feeds on which the bare clams have been grown have been discovered to have a profound impression on their dietary composition, thereby permitting for the lacking important vitamins to be added in future analysis. Collectively, these findings spotlight the usage of bare clams as a great future meals supply, each for people and environmental well being.

Why do we’d like sustainable meals?

Human land use, particularly throughout the agricultural sector, represents the best single supply of greenhouse gasoline emissions (primarily methane and nitrous oxide) on this planet right this moment. The United Nations (UN) has recognized present agriculture and livestock manufacturing developments as vital limitations to the worldwide effort to curb greenhouse gasoline emissions and warned that they might stop nations from assembly their international warming mitigation targets.

Lately, environmentally acutely aware people have shifted their consumption patterns away from typical purple meat in direction of’ blue meals’, nutrient sources derived from marine and aquatic organisms. These meals current a a lot smaller land, water, and carbon footprint than their terrestrial counterparts whereas being arguably extra nutritious. The rising international adoption of blue meals, whereas hitherto frequent in coastal areas, has resulted in current booms within the ‘city’ aquaculture business, offering a sustainable but profitable livelihood alternative to its workers.

Of the quite a few organisms underneath the ‘blue meals’ umbrella, bivalves, a cohort together with clams and mussels, stand out as distinctive sources of proteins and important micronutrients. Sadly, given their comparatively excessive manufacturing value, gradual maturation, development charge, and excessive susceptibility to an infection and illness, most aquaculture farmers shrink back from bivalve rearing in favor of extra worthwhile (but much less nutritious) sectors, together with salmon farming.

Teredinids, often known as ‘bare clams’ or ‘shipworms,’ are mollusks tailored for boring into wooden, which varieties the majority of their weight-reduction plan. In contrast to typical bivalves, teredinids have a a lot quicker development charge (the quickest of all recognized bivalves), and decrease manufacturing prices. Nevertheless, they’ve seldom been researched for his or her potential as a sustainable supply of blue meals protein. Curiously, Australian Aboriginals have farmed these animals as a meals supply for hundreds of years.

“Teredo navalis, the species of aquaculture potential utilized in our examine, can develop at 1.5–2 mm per day, far outstripping typical ‘large-shelled’ bivalves corresponding to mussels, which usually develop at 0.1–0.2 mm per day”

In regards to the examine

The current examine goals to set the groundwork for bare clam aquaculture by creating an aquaculture setup and evaluating the dietary composition of the clams underneath completely different dietary regimes, thereby establishing if dietary fortification may very well be used as a method to complement the clams’ inherent dietary advantages additional.

Wild Teredo navalis samples have been obtained from the north-eastern United States coast (Gloucester Harbour, MA, USA) by putting Japanese pine (Pinus strobus) panels within the water and permitting colonization of T. navalis larvae over the course of 10 months. On the time of assortment, the larvae have been roughly 9-month-old adults. Mytilus edulis (blue mussels) have been obtained from a business farming facility in Shetland, Scotland, to be used in dietary comparisons. The M. edulis samples have been two-year-old adults who had been reared on a wild marine plankton weight-reduction plan.

To check the dietary regimes’ impacts on T. navalis dietary content material, lipid-walled microcapsules have been produced utilizing the ultrasonic atomization of a premixed slurry comprised of 30% powdered Schizochytrium algae and an antibacterial waxy encapsulant. T. navalis have been uncovered to a few dietary regimes – wooden solely (W), microcapsules + wooden (MW), and Shellfish Weight-reduction plan 1800 + wooden (SDW). Fecal expulsion was used as a proxy for feeding charge. Feces have been measured every day through digital recordings and weekly through visible counting. Weekly countings have been additionally used to measure fecal weight, and picked up fecal pellets have been subjected to electron microscopy (scanning [SEM]).

Dietary profiling was carried out by homogenizing T. navalis tissue and comprised biochemical composition analyses, B12 content material estimation, and lipid quantification. Evaluation of variance (ANOVA) assessments have been used to distinction findings from the remedies (W vs. MW vs. SDW) and M. edulis samples.

Research findings

Feeding efficacy experiments revealed that the microcapsule + wooden weight-reduction plan resulted in considerably greater imply fecal weight (0.26 mg) in comparison with wooden solely (0.11) or Shellfish Weight-reduction plan 1800 + wooden (0.13). Fecal manufacturing charges, nonetheless, have been discovered to be considerably decrease within the microcapsule + wooden weight-reduction plan, suggesting that microcapsule supplementation might scale back business manufacturing prices, particularly these involving tank upkeep.

SEM outcomes depicted vital variations within the composition and construction of T. navalis reared on W in comparison with these raised on MW. Notably, MW-raised T. navalis have been discovered to supply considerably decrease pseudofeces than W-raised people, additional decreasing feed wastage and tank upkeep necessities.

Dietary evaluations revealed that T. navalis introduced greater ask contents than M. edulis akin to decrease portions of fat, carbohydrates, and proteins. Nevertheless, microcapsule supplementation alleviated these deficits, with MW clams presenting 29% greater protein content material than W clams. Concentrations of carbohydrates (19%) and lipids (3.8%) have been equally improved on microcapsule intervention.

“Analyses revealed that Bare Clams had considerably greater ranges of B12 than blue mussels. The B12 content material of Bare Clams ate up wooden + microcapsules was 142 ± 9 (SE) µg B12 per 100 g DW, considerably larger than that of blue mussels at 81 ± 9 (SE) µg per 100 g D”

Microcapsule supplementation was not discovered to change vitamin B12 concentrations between MW and W bare clams. Nevertheless, the concentrations of polyunsaturated fatty acids (PUFAs), Docosahexaenoic acid (DHA), and Eicosapentaenoic acid (EPA) have been considerably greater within the MW cohort.


The present examine presents the primary demonstration of bare clam aquaculture in addition to the scientific optimizations that may be employed to maximise yield and earnings for potential bare clam farmers. The examine additional assessed the dietary composition of bare clams, and located that, whereas wild T. navalis doesn’t meet the protein content material of typical blue mussels, the supplementation of algal microcapsules in T. navalis feed makes up for this noticed demerit.

In distinction, bare clams have been discovered to have considerably greater concentrations of important vitamins corresponding to vitamin B12 when in comparison with typical blue meals sources. Notably, bare clams reply properly to diet-based fortification, as advised by MW clams’ considerably greater dietary content material than their W counterparts.

“General, this examine has supplied the experimental basis for a brand new type of sustainable meals manufacturing that might flip wooden right into a protein and nutrient supply for mass market human consumption. Bare Clams are hardy, develop exceptionally quick, and could be produced in static saltwater techniques. There is a chance right here to construct a totally new aquaculture sector and open up a wealth of avenues for sustainable meals manufacturing and consumption.”



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