Alarming levels of plastic contamination* have been found in sardines, oysters, prawns and crabs, new research has revealed.
A team of University of Queensland researchers, led by PhD candidate Francisca Ribeiro, found significant amounts of microplastic* had been found in a range of edible seafood, most notably sardines, prawns, oysters, and crabs.
Microplastics are extremely small pieces of plastic debris in the environment that result from the disposal and breakdown of commercial plastic and industrial waste.
Ms Ribeiro said the study was an important step in understanding how human health could be affected by microplastics in seafood.
Among the samples, the most common plastic in use — polyethylene — was found in high levels of concentration*.
“We found polyvinyl chloride, a widely used synthetic plastic polymer, in all samples we tested,” Ms Ribeiro said.
“From the edible marine species tested, sardines had the highest plastic content, which was a surprising result.
“Another interesting aspect was the diversity* of microplastic types found among species, with polyethylene predominant* in fish and polyvinyl chloride the only plastic detected in oysters.”
The UQ research team found the total plastic concentration detected in each species was: 0.04mg in prawns, 0.1mg in oysters, 0.3mg in crabs, and 2.9mg in sardines.
Microplastics are very small pieces of plastic that pollute marine environments, and are eaten by a range of organisms, from planktonic* organisms to large marine mammals.
Studies show microplastics can also enter a human diet from bottled water, sea salt, beer, honey, and dust left to settle on meals.
The method developed and used by the UQ research team is a major step forward in being able to measure the amount of plastic in seafood, as it allows results to be reported in a mass unit which hasn’t been done before.
Say goodbye to 'single-use'
“We can now define what microplastic levels can be considered harmful to human health,” Ms Ribeiro said.
The next phase of the research project is to identify the sources of the plastic contamination found in the seafood tested.
- contamination: pollution
- microplastic: tiny pieces of plastic less than 5mm long
- concentration: the amount of a substance within a particular thing
- diversity: range of different types
- predominant: the main or strongest element
- planktonic: organisms that float in the water
- Which type of seafood had the highest level of microplastics?
- Where was the research team from?
- What do microplastics result from?
- Name two ways microplastics can enter the human diet.
- What does the next phase of the research aim to do?
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1. Tier 3 Vocabulary
Tier 3 vocabulary refers to low-frequency, subject-specific words – that is, words that you would not usually hear, say or read on a daily basis and that are only used when speaking about a particular topic. An example might be the word “photosynthesis” which you would really only use when reading, writing or discussing science related to plants.
Read the news article and write down any tier 3 vocabulary you can find. Then write an informative paragraph that contains all of the words you identified.
Time: allow 25 minutes to complete this activity
Curriculum Links: English; Science
Perhaps in the future seafood products may contain a health warning similar to those we see on cigarettes and alcohol. Draw what you think this might look like.
Time: allow 15 minutes to complete this activity
Curriculum Links: English; Visual Arts
Grammar and VCOP
The glossary of terms helps you to understand and learn the ambitious vocabulary being used in the article. Can you use the words outlined in the glossary to create new sentences? Challenge yourself to include other VCOP (vocabulary, connectives, openers and punctuation) elements in your sentence/s. Have another look through the article, can you find any other Wow Words not outlined in the glossary?
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