"Microplastic Contamination and Seafood Safety"
In 1869, a patent was taken out for a new substance to replace elephant ivory
in the production of billiard balls, and the plastics industry was born.
Ironically, what started out as a conservation-minded measure
has turned into an environmental problem.
Hundreds of thousands of tons of trillions of tiny plastic particles
are now floating on the surface of the sea.
This is how it works, either from plastic objects like water bottles
that get worn down into tinier and tinier pieces,
or plastic microbeads flowing down into the sewers from our sinks.
Plastic microbeads are often used as a scrubbing agent in personal care
and cosmetic products, such as facial cleansers, shower gels, and toothpaste,
and up to 94,000 microbeads could go down the drain in a single wash.
Then when you trawl the oceans you can find the same beads
you find in the facial scrubs.
Billions are emitted into aquatic habitats every day in the United States.
Laid end to end, the United States emits enough microbeads
to wrap around the planet more than seven times.
The reason this may be a problem is that the plastic then accumulates
toxic compounds from the water and then shuttles them,
along with any chemicals originally in the plastic, into marine organisms,
concentrating up the food chain and eventually ending up on our plates.
The potential hazardous effects on humans then evidently include
“alterations in chromosomes which lead
to infertility, obesity, and cancer.”
Wait, let’s take a step back, and review the evidence.
Plastic gets into the oceans, but does it even get into the fish?
Yes, microplastics have been shown to be ingested by fish and other seafood.
But are we then actually eating plastic-ingesting fish?
Yes, we are eating plastic-ingesting fish.
But don’t we just poop the plastic out?
Small enough microparticles may actually be able to get absorbed
through the intestinal wall and into our bloodstream.
This “uptake of ingested microparticles into small intestinal tissues
and on to secondary organs has moved from being an anecdotal phenomenon
to a recognized and quantifiable process.”
But that’s in rodents.
Just because it’s been demonstrated across a variety of lab animals,
you don’t know if it happens in people… until you put it to the test.
The closest we have is working with human placentas after childbirth,
and what they found is that plastic microparticles could indeed cross
the placental barrier from the maternal blood stream;
so, if it could get into a pregnant woman’s circulation
it might get into her baby’s circulation as well.
The reason this is concerning is that plastic debris
can be a source of toxic chemicals,
both chemical additives in the plastic itself,
and then pollutants the plastic sucks up
from the water that can then be later released into the body.
BPA is one of the chemical additives that can originate from the plastic itself.
Given that BPA concentrations have been measured in plastic debris,
microplastics may be a major source of BPA in seafood,
but no one’s really looked into it… until now—
BPA levels in the edible parts of seafood.
Yes, fish and seafood present one of the highest BPA contamination levels,
but is that just because they were looking at
canned fish products like tuna and sardines?
Manufacturers may use BPA in the lining of food cans directly.
Yes, BPA may also leach from the plastic in the oceans,
causing a direct contamination of fish-
in fact some argue that this BPA environmental contamination in fish
could be worse than the BPA from the cans themselves, but you don’t know…
until you put it to the test.
Here are the BPA levels found in canned seafood.
You can see the highest levels were found
in like tuna, cockles, sardines, and blue crab
but these were all canned; so you don’t know how much is from the can
versus the seafood itself, until you look at non-canned seafood,
and sometimes found even higher levels in some
fresh mollusks, clams, flounder, and cod.
That’s not good, since plastics chemicals such as BPA
are known endocrine disruptors, meaning known hormone disrupters.
And besides that, fat-soluble pollutants from the seawater can glom on to
the microplastic surfaces and potentially present additional risk,
which we’ll cover next.