In this section
Other true flies
- Dance fly (Empididae)
- Horse flies (Tabanidae)
- House fly (Muscidae)
- Long legged flies (Dolichopodidae)
- Marsh flies (Sciomyzidae)
- Mosquito (Coquillettidia)
- Mosquito (Culicidae)
- Moth fly (Psychodidae)
- Pelecorhynchid flies (Pelecorhynchidae)
- Primitive cranefly (Mischoderus)
Rat tail maggots (Syrphidae)
- Sandfly or black fly (Austrosimulium)
- Shore flies (Ephydridae)
- Soldier fly (Stratiomyidae)
- Wood gnat (Anisopodidae)
The breathing tube allows syrphids to live in waters with almost no oxygen. Such conditions might exist immediately below long-term discharges of organic waste such as silage pit leachate, dairy waste or sewage.
They eat decaying organic matter, hence their occurrence in waters with a long term supply of organic waste.
- Hard bottom: 1
- Soft bottom: 1.6
The tolerance values (ranging from 0 to 10) give an indication of which are the sensitive taxa (values of 8 or more) and which are the tolerant taxa (values of 3 or less). For more information see: Indicator species
The presence of syrphids in any stream indicates firstly that you shouldn’t be coming into contact with the water, and secondly you should be calling your local pollution hotline as syrphids are a sign of a serious pollution problem. Syrphids have tolerance values of 1 (hard bottom sites) and 1.6 (soft bottom sites) reflecting their association with heavily polluted waters.