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Avon & Dorset River Authority 1970 Stream water
analysis of stream below Portesham regarding a proposal
for a trout farm, for E.B. Swaffield, Manor Farm,
Portesham.
Chemical analysis results for the stream below
Portesham are given as below:
Temp 12EC
pH 7.9
Total solids 296 ppm
Suspended solids 6 ppm
Dissolved solids 290 ppm
Free ammonia None detectable
NO2 No trace
NO3 4.2 ppm
Cl- 29 ppm
Dissolved oxygen 11 ppm
O. Ab. 3min 0.1 ppm
O. Ab. 4 hrs 0.2 ppm
BOD 1.0 ppm
Comment is given that the water is clean, with
good oxygen levels, low BOD and no detectable free
ammonia indicating a lack of animal or plant waste
in the water, which is therefore suitable for rearing
trout (the subject of the proposal). Biological
analysis supported this conclusion, though invertebrates
were not sufficiently abundant to support a large
population of fish, therefore if a trout farm were
to be established, the fish would need to be fed.
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