Agriculture
Seeds of the Future
Earth-Friendly Fabrics
Where Have All the Bees Gone?
Amphibians
Poison Dart Frogs
Salamanders
Toads
Animals
Missing Moose
Mouse Songs
Mating Slows Down Prairie Dogs
Behavior
Girls are cool for school
Pondering the puzzling platypus
Video Game Violence
Birds
Finches
Peafowl
Albatrosses
Chemistry and Materials
The chemistry of sleeplessness
Atom Hauler
Salt secrets
Computers
Programming with Alice
The Shape of the Internet
Earth from the inside out
Dinosaurs and Fossils
Mammals in the Shadow of Dinosaurs
Did Dinosaurs Do Handstands?
The bug that may have killed a dinosaur
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Earth
Life trapped under a glacier
Ancient Heights
Pollution at the ends of the Earth
Environment
Saving Wetlands
A 'Book' on Every Living Thing
Cactus Goo for Clean Water
Finding the Past
A Long Haul
Oldest Writing in the New World
Meet your mysterious relative
Fish
Piranha
Pygmy Sharks
Nurse Sharks
Food and Nutrition
Food for Life
Symbols from the Stone Age
Chocolate Rules
GSAT English Rules
Order of Adjectives
Problems with Prepositions
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
Tarrant High overcoming the odds
The Annual GSAT Scholarships
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Scholarship
GSAT Mathematics
Detecting True Art
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Secrets of an Ancient Computer
Human Body
Attacking Asthma
Sun Screen
Kids now getting 'adult' disease
Invertebrates
Roundworms
Clams
Flatworms
Mammals
St. Bernards
Miscellaneous Mammals
Oxen
Parents
Expert report highlights the importance to parents of reading to children!
How children learn
Children and Media
Physics
Dreams of Floating in Space
Einstein's Skateboard
Spin, Splat, and Scramble
Plants
Seeds of the Future
Fast-flying fungal spores
Fungus Hunt
Reptiles
Black Mamba
Turtles
Box Turtles
Space and Astronomy
A Puffy Planetary Puzzle
A Galaxy Far, Far, Far Away
A Dead Star's Dusty Ring
Technology and Engineering
Space Umbrellas to Shield Earth
A Satellite of Your Own
Algae Motors
The Parts of Speech
What is a Noun
Adjectives and Adverbs
What is a Preposition?
Transportation
How to Fly Like a Bat
Tinkering With the Basic Bike
Are Propellers Fin-ished?
Weather
Weekend Weather Really Is Different
Earth's Poles in Peril
Warmest Year on Record
Add your Article

The mercury in that tuna

Eating fish can be good for you: It builds the brains of babies and helps the hearts of grown-ups. And eating fish can be bad for you: Fish from around the world swim in waters polluted with mercury, which gets into some fish, which gets into you when you take a bite. It can be tough to figure out which types of fish — and how much — a person can eat. But with a little reading and good information, a person can still eat fish and be healthy. In recent weeks, researchers have come up with some advice for how to get the fishy benefits and avoid the toxic mercury. Take tuna as an example. There are many different species of tuna, but grocery stores and restaurants often sell it without specifying which kind. But the amount of mercury tends to vary with the type of tuna. In one of the new studies, researchers studied 100 samples of sushi tuna purchased from grocery stores and restaurants. Jacob Lowenstein, a scientist at Columbia University in New York City, worked on the study. Sushi is a Japanese style of food presentation, usually involving fish that is served raw. Lowenstein and his colleagues studied the genetic material in the cells of the tuna. They discovered that the tuna came from three types: bigeye, bluefin and yellowfin species. As the scientists expected, bigger fish had more mercury. So tuna that came from yellowfin, the smallest type on average, had less mercury than tuna from bluefin, which are larger. But the scientists were surprised to discover that restaurant tuna contained more mercury than fish from the grocery store. Worse, yet, restaurant tuna had, on average, more mercury than the maximum amount recommended by the U.S. Environmental Protection Agency, or EPA. The EPA recommends that fish not contain more than 0.5 parts per million of mercury. The tuna from restaurants had 0.75 parts per million, on average, and some restaurant samples had levels as high as 1 to 2 parts per million. These numbers may seem small, but long term ingestion of even tiny amounts of mercury can lead to heart or nervous-system disease. As a result of their study, Lowenstein and his colleagues recommend that government “health agencies should consider adding bigeye and bluefin tuna to mercury advisories.” These advisories caution that people, especially pregnant women and young children, should avoid certain types of fish. Mercury is neurotoxic, which means it can injure developing brains. In another study, scientists from the University of Nevada Las Vegas looked at three kinds of canned tuna: solid-white, chunk-white and chunk-light. On average, light tuna had 0.28 parts per million, which is safely below the EPA’s recommendation. But solid and chunk-white types averaged 0.5 parts per million, right at the level of concern. The researchers calculated that a 55-pound child can safely eat only one serving every two weeks. The Nevada scientists recommend that government agencies be stricter about allowable mercury levels in fish. The EPA, the researchers recommend, should produce a clear policy that will tell people how much mercury they can consume — and where it comes from. The scientists would like to see a similar policy from the Food and Drug Administration (FDA). Right now, the FDA safety limit is 1 part per million, or twice that of the EPA. In a third study, Edward Groth III studied FDA's database that documents mercury contamination in 51 different types of fish and found that some types have 100 times the amount of mercury typically found in other types. This means there is no easy rule about mercury and fish — it depends on the species of fish and how contaminated the waters were in which it had lived. Groth produced a chart to make it easy for consumers to check the mercury content of the fish they’re about to eat or buy. The chart is small enough for a person’s pocket. In June, experts from around the world will get together in Stockholm, Sweden, to develop a world policy on mercury. Mercury can come from natural sources, like volcanoes, but it is also pollution produced by industrial sources like coal-fired power plants. Once mercury gets in the water and into the fish, it can get into you. But in this case, a little information can go a long way in keeping the mercury at bay.

The mercury in that tuna
The mercury in that tuna








Designed and Powered by HBJamaica.com™