supervisor: dr. d.v. robertson-andersson kzn 2/3. microplastics in...fish were caught in the...
TRANSCRIPT
Microplastics in marine organisms in KZN:
A new conservation threat?
R.P. Mofokeng,
Supervisor: Dr. D.V. Robertson-Andersson
Co-Supervisor: Mr. G.K. Moodley
University of KwaZulu-Natal (Westville Campus)
Small plastic particles, <5 mm in size.
There are two forms of microplastics namely; primary (A) and secondary (B)
microplastics.
Primary: mostly found in cosmetics, plastic beads and industrial effluent.
Secondary: result from degradation of large plastic debris which break down
over a period of time.
What are Microplastics ?
A A B
Plastics are very important and are used on a daily basis for different
purposes, e.g. food packaging, households items, facial cleansers etc.
4000km rivers, 18 catchments, 16 estuaries and 97 Km coastline
80% of microplastics in Durban are beads and fibres
Microplastic concentration are highest in Durban
Why microplastics ?
A systemic metaphoric analysis was followed
Only peer-reviewed papers were considered
Fish were caught in the KZN-Bight using an industrial crustacean trawler
Fish were dissected in the lab, analysed using an electronic microscope
Methodology
Results
Of 187 fish dissected, 34 % had plastics in them
ALL 16 species caught contained microplastics
Fish caught in the Durban eddy contained significantly
higher microplastic concentrations than fish caught in
Richards Bay or Durban
141 plastic pieces were recovered from fish digestive
tracts.
FISH IN THE KZN BIGHT
Microplastics in marine organisms in KZN:
A new conservation threat?
YES:
BUT
80% of microplastics in Durban’s marine environment are beads and fibres,
from household products.
Simple behavioural changes are some of the measures that can be taken to
reduce the amount of microplastics in aquatic systems.
The solution is within our means!!!