Swimming with the fishes again

For the first time, researchers have found that wild fish can identify individual human divers using visual cues.

In a study published in Biology Letters, researchers trained saddled sea bream and black sea bream to follow a diver for food. The fish quickly learned to distinguish between two different divers when they wore different dive gear.

However, when both divers dressed identically, the fish could not tell them apart, suggesting they rely mainly on external appearance rather than facial recognition.

While some animals, like dogs and crows, can recognize individual humans, this study provides the first strong evidence that wild fish can do the same — at least under certain conditions. This has implications for marine research, conservation and ethical considerations in human-wildlife interactions.

It also suggests that fish cognition may be more advanced than previously thought.

More on this topic: Baby fish master early survival skills

From petri dish to plate — the meat
industry takes a bite out of science

The world’s taste for meat is causing environmental and ethical problems. But scientists have been busy working on a possible solution: meat grown in a lab.

The first lab-grown burger was eaten in 2013 at a press conference by its producer Mark Prost, a biomedical engineer at Maastricht University in the Netherlands. And it cost approximately U.S.$330,000. Ten years on and the food industry is working toward commercializing lab-grown meat products and adding them to restaurant menus at a price restaurant-goers can better afford. Nature reports this will happen in the U.S. by the end of 2023.

The United States Department of Agriculture recently approved the sale to consumers of lab-grown chicken products from two companies — Upside Foods and Good Meat. The U.S. is the second country to legalize the sale of lab-grown meat. Good Meat has been selling its products in Singapore for two years now. And according to experts, the industry is about to boom.

Business Wire estimates the cultivated-meat market will increase at a compound annual growth rate of 24.1 percent between 2025 and 2035 to reach 1.99 billion consumers. And more than 70 companies around the world are working to cultivate lab-grown meat.

But is it meat, or isn’t it?


Technically, it is. The meat is grown in a lab but it is grown from animal cells. The cells are placed in bioreactors — similar to a tank —providing the nutrients needed for procreation. The growth media (solid or liquid used to enhance growth) is then changed so the cells can develop into the main components of meat. So effectively, we are growing the meat, rather than growing the animal for meat.

Some people might welcome such a change in the food industry. And for good reason.

Our World in Data estimates 80 billion animals are slaughtered annually for meat. For context, the U.S. Department of Agriculture reports that in 2020, almost 1 million animals were killed for food every hour in the United States alone.

The livestock industry is also responsible for 16.5 percent of the world’s total greenhouse gases. The two main gases produced are methane, which is over 25 times more impactful than carbon dioxide, and nitrous oxide, which is 300 times more potent than carbon dioxide. These gases are the result of activities involved in running a livestock operation but are also produced by the animals’ digestive functions. New Zealand is the first country to propose a tax on farmers for the greenhouse gases produced from cow belching.

While harmful greenhouse gases are one argument in favor of growing meat in a lab, so is the land mass the livestock industry occupies. Beef cattle alone take up 60 percent of the world’s agricultural space. This includes grazing area and land used to grow feed.

At the Dubai Future forum in 2022, technology futurist Jamie Metzle said the agricultural industry cannot continue at its current pace. “If we continue as we are now, we’re going to need 70 percent more arable land. We do not have that amount and a lot of arable land is becoming less arable because of climate change,” he said.


Though lab-grown meat will solve some of the world’s environmental problems, the industry has its challenges.

There is the energy required to produce cultured meat to consider. A 2023 Nature article reports lab-grown meat requires 60 percent more energy per kilogram to produce than current beef production methods. However, renewable resources might reduce the required energy. “The carbon footprint (production) of cultured meat could be smaller than that of conventional meat,” the Nature article reads.

Additionally, the cost is still significantly higher for consumers. It may not be hundreds of thousands of dollars like it was in 2013, but at almost U.S.$10 for a burger, it is still more expensive compared with, say, a McDonald’s burger. This is expected to reduce further as researchers tweak the production process and cultured meats become more commercialized.

The social stigma around eating something created in a lab may also deter consumers. But a 2019 study in Science Direct suggests consumers can be swayed by semantics or how the meat is marketed. According to a 2023 article in The Guardian, one of the producers approved by the U.S. Food and Drug Administration will have its cultivated meat in supermarkets by 2028.

But twenty-five percent of the global market are halal consumers. So, can it be halal certified, or is the industry alienating a large chunk of the consumer market?

Good Meats’ website indicates that halal certification is a priority. “We are currently exploring the possibility of halal certification and will work closely with the religious authorities given that slaughter-free, cultivated meat is novel,” it reads.

The UAE in 2023 was part of a round of funding totaling U.S $105 billion in a start-up to grow lab-cultured steaks.

Clownfish use ‘Trojan horse’ strategy
to avoid stings

Clownfish weave effortlessly through the venomous tentacles of their sea anemone hosts using a “Trojan horse” strategy that prevents the anemone from recognizing them as prey.

Sea anemones use nematocysts, tiny, harpoon-like structures filled with toxins, to capture prey. These cells fire when they detect certain chemical signals, including sialic acid, a sugar found on the surface of most marine animals.

When a fish brushes against an anemone, its sialic acid triggers the anemone’s defensive response, leading to a venomous sting.

Research published in BMC Biology found that anemonefish have dramatically lower levels of sialic acid in their mucus. Sialic acids have important biological functions and clownfish regulate the production in their mucus only to allow them to live symbiotically with the anemone.

While the researchers at Okinawa Institute of Science and Technology still don’t know how the anemonefish do this, their study found juveniles initially have high sialic acid levels and are vulnerable to stings, but as they grow, their mucus composition changes, offering some insight to potential mechanisms.

Related topic: 3D-printed reefs part of the UAE’s plans for food security

This April, become a citizen scientist

We often think of science as the sole domain of researchers who have made it their life’s work. But there’s also room for regular people to get involved. This is especially true in April, which is Global Citizen Science Month.

Citizen science is exactly what it sounds like — the opportunity for laypeople to get involved in science on whatever level of involvement they choose. From bird-watching to weather monitoring to measuring the brightness of the night sky, there is something to satisfy many areas of scientific interest.

One example of a citizen science initiative is the Sahim app, which launched in February. This app, which takes its name from the Arabic word for “contribute,” allows participants to record and upload data related to discarded single-use plastic. The data goes directly to the Environment Agency-Abu Dhabi and helps scientists and policy makers create future directives.

Global Citizen Science Month is a collaboration between Arizona State University in the United States, SciStarter and the Library of Medicine. SciStarter, founded by Darlene Cavalier of ASU, has been running Citizen Science Month since 2016.

The program is dedicated to rallying people all over the world and encouraging their involvement in the advancement of science. The month includes programs and events hosted by citizen science project leaders and scientists to call upon people from all walks of life to get involved in scientific research in their communities or on a global scale.

IMAGE Credit: Unsplash

Involvement in a project can range from one person to millions. People participate in the “development of research questions and hypotheses, data collection, data analysis, drawing conclusions, and disseminating data,” says a team of researchers in a 2021 paper published in Springerlink. And the movement can be crucial for scientific development as data can be collected on a massive scale — data that one scientist could not collect on their own.

SciStarter is an organization that recruits, trains and equips citizen scientists globally. It currently has more than 3000 active and vetted citizen science projects and more than 100,000 participants, both running the research and looking to participate.

A new type of brain cell identified
for object permanence

Not all memory functions are handled by the same type of neuron. Research published in Nature Communications identified a previously unknown class of neuron in the hippocampus, the region known as the brain’s memory center, that is dedicated solely to object memory.

“Ovoid” neurons, named for their shape, were found to play a crucial role in recognizing objects over both short and long time periods. Unlike the pyramidal neurons that process spatial information like remembering a location, ovoid neurons activate only when encountering new objects and are silent when seeing familiar objects, even months later.

Researchers from the University of British Columbia used a technique that allows neurons to be activated or silenced with light in mice trained in an object-recognition task. When ovoid neurons were silenced, mice were unable to recognize objects they had previously seen, effectively “erasing” object memories. When the ovoid neurons were artificially activated, mice showed a strong preference for familiar objects.

This discovery challenges the long-held belief that the hippocampus flexibly encodes both spatial and non-spatial information. Instead, the brain appears to have separate, specialized circuits for different types of memory. This could have profound implications for neurodegenerative diseases like Alzheimer’s, where memory loss often affects object recognition before spatial memory.

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