Water samples were collected along a transect running from the north of the farm area, through the farm and to the south of the farm. A reference site was also included in a nearby creek unaffected by aquaculture activities.
Sampling sites used for water quality measurements. The station notation indicates approximate distance (m) north or south of the Cage site. The major factor determining the concentration of water quality variables within Conn Creek is the season – all water quality variables tested had significantly higher values during the wet season. Only 5 water quality variables showed differences between locations. Of these, 3 are dissolved species of nitrogen (NH4, NO3and TDN) and indicate local enrichment around the farm lease area.
Box plot of ammonium vs. location in both wet and dry seasons. The boxes represent the 25thand 75thpercentile, the whiskers represent the 10thand 90thpercentiles. The black bar represents the median, the white bar the mean. Outliers are indicated by symbols.
Box plot of dissolved phosphate vs. location in both wet and dry seasons, as above.
Box plot of chlorophyll a vs. location in both wet and dry seasons, as above.
Box plot of total dissolved nitrogen vs. location in both wet and dry seasons, as above.