Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...

4.4 Overall (multivariate patterns)The principal components spatial representation of the combined data is shown in Figure 4.1.4UpBoyne23Rodds2Dimension 2 (25% variation)210-1Hamilton2Rodds1LwBoyne2UpBoyne1LwBoyne1Fitzroy2Bundy1Awoonga1Bundy2Fitzroy1-2Hamilton1Calliope2Calliope1-6 -5 -4 -3 -2 -1 0 1 2 3Dimension 1 (38% variation)Figure 4.1. Movements of the overall location and trip principal component means for barramundi inmultidimensional space. The reference sites are indicated by the squares with the dottedlines.Most points are in the lower‐right region, reasonably close to the reference sites. The ‘slightly‐removed’group at the bottom (Rodds Bay Trip 1, and Calliope and Hamilton Trip 2) generally represent ‘good‐most abnormality quality’ fish, with low scores for HAI and rates.The most notable outlying points are –Rodd’s Bay (Trip 2) – this total sample consisted of only two fish, both of which were diseased, so thesegave ‘poor quality’ values across most of the variables.Upper Boyne (both trips) – generally had higher values for most variables, except this site did have zeroparasites.Lower Boyne, Trip 1 – had high HAI and lesions; however by trip 2 this site had ‘reverted’ back into thegeneral pack.Samples from the Harbour (Trip 1 only) were not submitted to the laboratory, hence for this locationthere are only values for field‐assessed disease, skin condition and lesion ratings. Based on these threevariables, the barramundi from the Harbour were very similar to those sampled from the Fitzroy River onTrip 1.119