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By Hugo Francisco de Souza Nov 23 2023 Reviewed by Danielle Ellis, B.Sc.

In a research study published in Sustainable Agriculture, researchers evaluated teredinids as a potentially nutritious and sustainable future food source. They developed a pilot aquaculture system for these colloquially named 'naked clams' and elucidated their nutritional value when compared to conventional 'blue foods' such as blue mussels. Their findings reveal that naked clams are rich in beneficial nutrients, including monounsaturated fatty acids and vitamin B12, while containing protein content comparable to the blue mussels. Study: Naked Clams to open a new sector in sustainable nutritious food production. Image Credit: Andreea Photographer/Shutterstock.com

Encouragingly, tailored microencapsulated algal feeds on which the naked clams were grown were found to have a profound impact on their nutritional composition, thereby allowing for the missing essential nutrients to be added in future research. Together, these findings highlight the use of naked clams as an ideal future food source, both for humans and environmental health. Why do we need sustainable food?

Human land use, especially within the agricultural sector, represents the highest single source of greenhouse gas emissions (mainly methane and nitrous oxide) in the world today. The United Nations (UN) has identified current agriculture and livestock production trends as significant barriers to the global effort to curb greenhouse gas emissions and warned that they may prevent nations from meeting their global warming mitigation targets.

In recent years, environmentally conscious individuals have shifted their consumption patterns away from conventional red meat towards' blue foods', nutrient sources derived from marine and aquatic organisms. These foods present a much smaller land, water, and carbon footprint than their terrestrial counterparts while being arguably more nutritious. The rising global adoption of blue foods, while hitherto common in coastal regions, has resulted in recent booms in the 'urban' aquaculture industry, providing a sustainable yet lucrative livelihood opportunity to its employees.

Of the numerous organisms under the 'blue foods' umbrella, bivalves, a cohort including clams and mussels, stand out as exceptional sources of proteins and essential micronutrients. Unfortunately, given their relatively high production cost, slow maturation, growth rate, and high susceptibility to infection and disease, most aquaculture farmers shy away from bivalve rearing in favor of more profitable (yet less nutritious) sectors, including salmon farming.

Teredinids, also known as 'naked clams' or 'shipworms,' are mollusks adapted for boring into wood, which forms the bulk of their diet. Unlike conventional bivalves, teredinids have a much faster growth rate (the fastest of all known bivalves), and lower production costs. However, they have seldom been researched for their potential as a sustainable source of blue food protein. Interestingly, Australian Aboriginals have farmed these animals as a food source for centuries.

"Teredo navalis, the species of aquaculture potential used in our study, can grow at 1.5–2 mm per day, far outstripping conventional 'large-shelled' bivalves such as mussels, which typically grow at 0.1–0.2 mm per day" About the study

The present study aims to set the groundwork for naked clam aquaculture by developing an aquaculture setup and evaluating the nutritional composition of the clams under different dietary regimes, thereby establishing if dietary fortification could be used as a means to supplement the clams' inherent nutritional benefits further. Related StoriesGlobal food trade improves diets but red meat imports raise health concernsEmulsifiers and heart health: a prospective cohort study reveals associationsExploring nature's palette: The promising future of natural food colorants

Wild Teredo navalis samples were obtained from the north-eastern United States coast (Gloucester Harbour, MA, USA) by placing Eastern pine (Pinus strobus) panels in the water and allowing colonization of T. navalis larvae over the course of 10 months. At the time of collection, the larvae were approximately 9-month-old adults. Mytilus edulis (blue mussels) were obtained from a commercial farming facility in Shetland, Scotland, for use in nutritional comparisons. The M. edulis samples were two-year-old adults who had been reared on a wild marine plankton diet.

To test the dietary regimes' impacts on T. navalis nutritional content, lipid-walled microcapsules were produced using the ultrasonic atomization of a premixed slurry comprised of 30% powdered Schizochytrium algae and an antibacterial waxy encapsulant. T. navalis were exposed to three dietary regimes – wood only (W), microcapsules + wood (MW), and Shellfish Diet 1800 + wood (SDW). Fecal expulsion was used as a proxy for feeding rate. Feces were measured daily via digital recordings and weekly via visual counting. Weekly countings were also used to measure fecal weight, and collected fecal pellets were subjected to electron microscopy (scanning [SEM]).

Nutritional profiling was carried out by homogenizing T. navalis tissue and comprised biochemical composition analyses, B12 content estimation, and lipid quantification. Analysis of variance (ANOVA) tests were used to contrast findings from the treatments (W vs. MW vs. SDW) and M. edulis samples. Study findings

Feeding efficacy experiments revealed that the microcapsule + wood diet resulted in significantly higher mean fecal weight (0.26 mg) compared to wood only (0.11) or Shellfish Diet 1800 + wood (0.13). Fecal production rates, however, were found to be significantly lower in the microcapsule + wood diet, suggesting that microcapsule supplementation could reduce commercial production costs, especially those involving tank maintenance.

SEM results depicted significant differences in the composition and structure of T. navalis reared on W compared to those raised on MW. Notably, MW-raised T. navalis were found to produce significantly lower pseudofeces than W-raised individuals, further reducing feed wastage and tank maintenance requirements.

Nutritional evaluations revealed that T. navalis presented higher ask contents than M. edulis corresponding to lower quantities of fats, carbohydrates, and proteins. However, microcapsule supplementation alleviated these deficits, with MW clams presenting 29% higher protein content than W clams. Concentrations of carbohydrates (19%) and lipids (3.8%) were similarly improved on microcapsule intervention.

"Analyses revealed that Naked Clams had significantly higher levels of B12 than blue mussels. The B12 content of Naked Clams fed on wood + microcapsules was 142 ± 9 (SE) µg B12 per 100 g DW, significantly greater than that of blue mussels at 81 ± 9 (SE) µg per 100 g D"

Microcapsule supplementation was not found to alter vitamin B12 concentrations between MW and W naked clams. However, the concentrations of polyunsaturated fatty acids (PUFAs), Docosahexaenoic acid (DHA), and Eicosapentaenoic acid (EPA) were significantly higher in the MW cohort. Conclusions

The current study presents the first demonstration of naked clam aquaculture as well as the scientific optimizations that can be employed to maximize yield and profits for prospective naked clam farmers. The study further assessed the nutritional composition of naked clams, and found that, while wild T. navalis does not meet the protein content of conventional blue mussels, the supplementation of algal microcapsules in T. navalis feed makes up for this observed demerit.

In contrast, naked clams were found to have significantly higher concentrations of essential nutrients such as vitamin B12 when compared to conventional blue food sources. Notably, naked clams respond well to diet-based fortification, as suggested by MW clams' significantly higher nutritional content than their W counterparts.

"Overall, this study has provided the experimental foundation for a new form of sustainable food production that could turn wood into a protein and nutrient source for mass market human consumption. Naked Clams are hardy, grow exceptionally fast, and can be produced in static saltwater systems. There is an opportunity here to build a completely new aquaculture sector and open up a wealth of avenues for sustainable food production and consumption."Journal reference: Willer, D.F., Aldridge, D.C., Mhrshahi, P. et al. Naked Clams to open a new sector in sustainable nutritious food production. npj Sustain. Agric. 1, 4 (2023). doi: https://doi.org/10.1038/s44264-023-00004-y

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Budget 2025: Ex-Bank of England rate setter Andy Haldane criticises ‘repeated mistakes’

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Budget 2025: Ex-Bank of England rate setter Andy Haldane criticises 'repeated mistakes'

A former Bank of England chief economist has told Sky News that “repeated mistakes” by the government have been “sucking all life” from the economy ahead of the budget.

Andy Haldane said the country had to find a new way of treating the build-up to the annual fiscal event, as budget rumour and speculation – initiated in part by ministers and via leaks – had fed acts of self-harm for the past two years.

“It’s been a bad hand played, in truth, pretty poorly,” he said of the chancellor’s stewardship during his appearance on Mornings with Ridge and Frost.

“So mistakes have been made and repeated mistakes. And the worst of that, I would say, is it’s repeated mistakes.”

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The build up to this budget, and Rachel Reeves‘s first speech last October, have each been dominated by talk of crisis for the public finances.

Mr Haldane told Sophy Ridge: “The black hole narrative that you and I discussed a year ago, sucking all life or energy and light from the economy, has been a mistake repeated this time as well.

“So not enough has been done to give growth a chance to create that stability. It’s only 16 months since Keir Starmer said I want to tread more lightly on our lives. That has singularly not happened. That speculation is proof positive of that.”

Mr Haldane, who served on the Bank’s rate-setting committee for seven years, was speaking after official figures last week showed a bigger than expected climb in the UK’s unemployment rate to 5% – a level not seen since the COVID pandemic.

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Why is the economy flatlining?

The Office for National Statistics (ONS) also reported weaker than forecast economic growth during the third quarter of the year, slowing to 0.1%.

He argued there was a clear link between the data and the looming budget, which takes place next week.

“If you speak to businesses, speak to consumers, their fearfulness about where the axe will fall is causing them, not unreasonably, to save rather than spend, to not put their balance sheet to work and that has taken the legs from beneath growth in the economy,” he said.

Asked if that was the government’s fault or inevitable, he replied: “The process has become far too elongated and far too leaky, to be honest.

“You know, we have this pretty much daily speculation about the next tax rise… we need to re-engineer that process to either make it watertight, like the Bank of England’s monetary policy decisions or a genuinely open consultation.

“Right now, we have this halfway house of leaks and speculation which serves absolutely no one. Least of all the economy.”

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Minister on income tax U-turn

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He made his remarks after the events of last Friday that saw the chancellor apparently rule out a Labour manifesto-breaking hike to income tax.

That was despite Ms Reeves using a speech earlier this month to prepare the ground for such a move – to the horror of many Labour MPs.

Treasury sources insisted the U-turn could be explained by better than expected economic forecasts by the Office for Budget Responsibility (OBR).

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Former Bangladesh PM Sheikh Hasina sentenced to death for crimes against humanity

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Former Bangladesh PM Sheikh Hasina sentenced to death for crimes against humanity

Sheikh Hasina, Bangladesh’s ousted prime minister, has been sentenced to death after being convicted of crimes against humanity.

It follows a months-long trial in the country that found her guilty of ordering a deadly crackdown on a student-led uprising last year.

The former leader, exiled in India, was tried in absentia after the United Nations said up to 1,400 people may have been killed in the violence.

Bangladesh’s health adviser under the interim government said more than 800 people were killed and about 14,000 were injured.

The students initially started protesting over the way government jobs were being allocated, but clashes with police and pro-government activists quickly escalated into violence.

The court revealed conversations of Hasina directing security officers to drop bombs from helicopters on the protesters.

She also permitted the use of lethal weapons, including shotguns at close range for maximum harm, the court was told.

Hasina, who previously called the tribunal a “kangaroo court”, fled to India in August 2024 at the height of the uprising, ending 15 years of rule.

In a statement released after the verdict, Hasina said the ruling was “biased and politically motivated” and “neither I nor other political leaders ordered the killing of protesters”.

“I am not afraid to face my accusers in a proper tribunal where evidence can be weighed and tested fairly,” she added.

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August 2024: Protesters celebrate Sheikh Hasina’s resignation

The 78-year-old is the daughter of Sheikh Mujibur Rahman, who led the country to independence.

The International Crimes Tribunal, Bangladesh’s domestic war crimes court located in the capital Dhaka, delivered its four-hour verdict amid tight security.

Hasina received a life sentence under charges for crimes against humanity and the death sentence for the killing of several people during the uprising.

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What was behind the protests?

The packed courtroom cheered and clapped when the sentence was read out.

The tribunal also sentenced former home minister Asaduzzaman Khan – also exiled in India – to death.

A third suspect, a former police chief, was sentenced to five years in prison as he became a state witness against Hasina and pleaded guilty.

The ruling is the most dramatic legal action against a former Bangladeshi leader since independence in 1971 and comes ahead of parliamentary elections expected to be held in February.

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July 2024: Bangladesh protest has ‘become a war’

Foreign ministry officials in Bangladesh have called on India to hand over the former prime minister, adding it was obligated to do so under an existing treaty between the two nations. India has not yet made any response.

Paramilitary border guards and police have been deployed in Dhaka and many other parts of the country, while the interim government warned any attempt to create disorder will be “strictly” dealt with.

It comes after Hasina’s Awami League party called for a nationwide shutdown as part of a protest against the verdict.

The mood in the country had been described as tense ahead of Monday’s ruling.

The protests escalated during the summer of 2024. Pic: AP
Image:
The protests escalated during the summer of 2024. Pic: AP

Pic: AP
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Pic: AP

At least 30 crude bomb explosions and 26 vehicles were set on fire across Bangladesh during the past few days.

Local media said two people were killed in the arson attacks, according to the Associated Press.

Hasina is also the aunt of former UK government minister, Tulip Saddiq, who resigned from her Treasury job at the start of this year.

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Ms Siddiq had faced calls to step down over links to her aunt and was also said to be facing a corruption trial in Bangladesh.

She told Sky News in August the accusations were “nothing more than a farce” and said she had never been contacted by the Bangladeshi authorities.

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Home Secretary Shabana Mahmood threatens Trump-style visa ban on three countries as part of radical asylum reforms

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Home Secretary Shabana Mahmood threatens Trump-style visa ban on three countries as part of radical asylum reforms

Home Secretary Shabana Mahmood plans to impose Trump-style visa bans on three African countries if they fail to take back illegal migrants as part of “sweeping reforms” of the UK’s immigration system.

Angola, Namibia and the Democratic Republic of Congo will face visa sanctions, blocking their tourists, VIPs and business people from travelling to Britain if they do not improve co-operation on removals.

Ms Mahmood said: “In Britain, we play by the rules. When I said there would be penalties for countries that do not take back criminals and illegal immigrants, I meant it.

“My message to foreign governments today is clear: accept the return of your citizens or lose the privilege of entering our country.”

The move was reportedly inspired by President Trump’s homeland security secretary, Kristi Noem, who has overseen the mass deportation policy in the US, according to The Times.

Ms Mahmood will address the House of Commons today to lay out “the most sweeping reforms to tackle illegal migration in modern times”, effectively since the Second World War.

Modelled on the Danish system, the aim is to make the UK less attractive for illegal immigrants and make it easier to deport them.

Under the plans, the home secretary will bring forward a bill to change how article 8 of the European Convention on Human Rights (ECHR), the right to family life, is applied in migration court cases.

The Home Office has said it’s seen a rise in the use of rights-based appeals in recent years as a means of avoiding deportation.

The changes would see only those with immediate family in the UK, such as a parent or child, being able to use article 8 in future.

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‘Illegal migration is creating division across UK’ – Shabana Mahmood

The home secretary, who has been in the job for 73 days, also plans to change the law so that multiple attempts to appeal against refusals for asylum will no longer be allowed.

Furthermore, refugees would face a 20-year wait before they can apply for permanent settlement.

The Home Office said the “golden ticket” deal has seen asylum claims surge in the UK, drawing people across Europe, through safe countries, on to dangerous small boats.

Under the proposals, refugee status would become temporary and subject to regular review, with refugees removed once their home countries are deemed safe.

Housing and weekly allowances would also no longer be guaranteed.

Mahmood is new hard woman of British politics – and potential successor to Starmer


Amanda Akass

Amanda Akass

Political correspondent

@amandaakass

We’re told that Shabana Mahmood, the still new home secretary, is “a woman in a hurry”.

She’s been in the job for 73 days – and is now announcing “the most sweeping reforms to tackle illegal migration in modern times” – effectively since the Second World War.

Her language is not just tough – it’s radical. Not what you’d have expected to hear from a Labour home secretary even just a few months ago.

“Illegal migration”, she believes, “is tearing our country apart. The crisis at our borders is out of control”.

Her team argues that those never-ending images of people crossing the Channel in small boats have led to a complete loss of faith in the government’s ability to take any action at all – let alone deliver on its promises.

The political reality is that successive failures of Tory and Labour ministers have fuelled the inexorable rise of Reform.

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The shake-up also envisions the introduction of safe and legal routes to the UK in a bid to cut dangerous journeys across the Channel.

A new independent body – similar to one in Denmark – is planned to fast-track the removal of dangerous criminals, and last-minute appeals would be expedited.

Ms Mahmood has denied that her plans are “racist”, instead describing them as a “moral mission”.

She said illegal immigration was causing “huge divides” in the UK, adding: “I do believe we need to act if we are to retain public consent for having an asylum system at all.”

What measures is the home secretary set to announce?

  • Refugee status will become temporary and subject to regular review – with people facing removal as soon as their home countries are deemed safe
  • Asylum seekers will face a 20-year wait before they can apply for permanent settlement
  • New safe and legal routes to be introduced for those genuinely fleeing war and persecution
  • Changes to the legal framework that will require judges to prioritise public safety over migrants’ rights to a family life – amid fears that Article 8 of the European Convention on Human Rights has been used to frustrate removals
  • Using facial age estimation technology, a form of AI ,to rapidly assess a person’s age in a bid to deter people who pretend to be children in an attempt to claim asylum
  • Capped work and study routes for refugees will also be created  

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Shabana Mahmood is the new hard woman of British politics
Here’s how the Danish migration model works

Speaking on Sunday Morning with Trevor Phillips, Ms Mahmood said she had observed how illegal migration had been “creating division across our country”.

She added: “I can see that it is polarising communities across the country. I can see that it is dividing people and making them estranged from one another. I don’t want to stand back and watch that happen in my country.”

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Govt ‘lacks empathy and understanding’ for refugees

Prime Minister Sir Keir Starmer said: “Britain has always been a fair, tolerant and compassionate country – and this government will always defend those values.

“But in a more volatile world, people need to know our borders are secure and rules are enforced. These reforms will block endless appeals, stop last-minute claims and scale up removals of those with no right to be here.”

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Anti-asylum seeker protest in East Sussex

Conservative Party leader Kemi Badenoch welcomed Ms Mahmood “finally talking seriously about tackling illegal immigration”, but called the plans “weak”.

She said: “If the home secretary actually wants to cut illegal immigration, she should take up my offer to sit down with her and work on a plan that will actually stop the boats, rather than a few weak changes that will meet the approval of Labour MPs.”

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‘Mahmood’s own MPs calling her racist’ – Zia Yusuf

Speaking earlier on Sunday, Reform UK leader Nigel Farage said: “The home secretary sounds like a Reform supporter.”

“Sadly with the Human Rights Act and ECHR membership, the changes won’t survive the courts or probably even her own backbenchers,” he added.

The Refugee Council warned that the government would accrue a cost of £872m over 10 years as a result of the need to review asylum seekers’ status to remain in the UK.

Enver Solomon, the charity’s chief executive, insisted the changes “will not deter people from making dangerous crossings, but they will unfairly prevent men, women and children from integrating into British life”.

Latest Home Office figures show 39,075 people have arrived in the UK after crossing the English Channel in small boats so far this year.

The arrivals have already passed the number for the whole of 2024 (36,816) and 2023 (29,437), but the number is below the total for 2022 (45,774).

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