C. Nutrients Flashcards
1
Q
What substance released from watercress farms can adversely impact on freshwater shrimp?
A
PEITC
Phenethyl Isothiocyanate
2
Q
With regards to PEITC and freshwater shrimp classify the pollutant
A
Point-source primary pollutant
3
Q
What are the two short-term effects of PEITC on freshwater shrimp?
A
- Disruption to precopular pairing.
2. Increased mortality
4
Q
What is the long-term effect of PEITC on freshwater shrimp?
A
Reduced reproductive success.
5
Q
How can the effects of PEITC on freshwater shrimp be mitigated?
A
Recycling discharge water from the cleaning process back through the watercress beds allows the PEITC to decay.
Settlement tanks for discharge water.
(PEITC is short-lived in the environment with a half-life of 30 minutes).
Parabolic Screens to prevent leaf-fragments from entering the stream.
