MAR 06, 2022 10:00 AM PST

Does Your Pet's Food Have Endangered Shark In It? DNA Technology Can Tell.

WRITTEN BY: Ryan Vingum

Sharks play crucial roles in marine ecosystems. As predators, they loom large at the top of many marine food chains and help maintain a certain balance. 

Unfortunately, many shark species are declining in numbers, with many of them endangered or at risk of endangerment, threatening ecosystems. There are many reasons for these declines (such as climate change and loss of habitat) though overfishing of sharks, in particular, has caused a significant decrease in shark populations. Shark byproducts are used for a range of purposes, including meat and even beauty cosmetics (though all plants and animals make it, an oil called squalene is derived from sharks for many cosmetic products). 

To make matters worse, it turns out the meat of endangered sharks could be showing up in your pet’s food. 

Published in Frontiers in Marine Science, researchers outline efforts to understand to what extent shark byproducts are found in pet foods sold in Asian markets. Researchers cite a previous study conducted in the U.S. that had similar goals, and found the presence of sharks in 78 different pet food products. 

Researchers looked at 144 different samples of pet food products sold in Singapore to look for traces of shark by product. Researchers found that almost a third of sampled products contained shark byproducts, with the most prominent species including the blue shark and  whitetip reef shark, both of which are listed as vulnerable species. 

DNA barcoding was used to look for shark DNA in pet food products. DNA barcoding is a way of making species-level identifications. Barcoding usually uses a particular section of a DNA sequence from a genome to make these identifications. In addition to helping monitor species, barcoding can also be used for a range of other conservation tasks as well agriculture, for example.  

But “shark” doesn’t show up on a food label; you might see a vague term like “ocean fish” or “white fish,” instead. That’s why the study authors urge for greater transparency in food labeling to help call attention to the overfishing of endangered shark species and help regulate fishing activities. 

Sources: EurekaAlert!; Frontiers in Marine Science; Nature

About the Author
Professional Writing
Science writer and editor, with a focus on simplifying complex information about health, medicine, technology, and clinical drug development for a general audience.
You May Also Like
APR 01, 2022
Chemistry & Physics
Detecting Chemical Weapons with Flies
APR 01, 2022
Detecting Chemical Weapons with Flies
Forgot expensive mechanical detectors; the newest innovation in chemical weapons is blowflies. Students led by Nick Mani ...
MAY 06, 2022
Cannabis Sciences
What's hemp packaging, and why does it matter?
MAY 06, 2022
What's hemp packaging, and why does it matter?
Hemp packaging is the latest craze in sustainability. Here's what's behind it, and why advocates say it's effective.
MAY 12, 2022
Health & Medicine
Pet Cannabis Poisoning is on the Rise
MAY 12, 2022
Pet Cannabis Poisoning is on the Rise
An analysis of surveys completed by veterinarians indicated an increasing number of pet cannabis poisonings was recently ...
MAY 23, 2022
Plants & Animals
Dolphins Use Coral to Treat Skin Conditions
MAY 23, 2022
Dolphins Use Coral to Treat Skin Conditions
According to a new research study published in iScience, specific species of dolphins can experience skin irritation or ...
JUN 03, 2022
Cannabis Sciences
Seeds matter when growing cannabis
JUN 03, 2022
Seeds matter when growing cannabis
Seeds are where it all begins when growing high quality weed. Here's how to select the right ones.
JUN 30, 2022
Cell & Molecular Biology
Zika- and Dengue-Infected Humans are More Attractive to Mosquitoes
JUN 30, 2022
Zika- and Dengue-Infected Humans are More Attractive to Mosquitoes
Researchers have found that when people have a Zika or dengue virus infection, they release a molecule that can attract ...
Loading Comments...