Ditylum brightwellii
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,872
Lithodesmium undulatum
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 235
Helicotheca tamesis
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 171