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

Table 2.3f. Muscle lesions.Lake FitzroyBundaberg Hamilton UpperAwoongaRive rPoint Boyne R. Avg. s.e.Trip 1 0.00 c 0.13 bc 0.54 ab 0 .31 abc 0.05 bc 0.22Trip 2 0.13 bc 0.30 abc 0.95 a 0.12 bcThere was no significant effect of location, trip or their interaction on the classification of liver lipid. Table2.4 shows that the counts by locations are well distributed across the liver lipid categories.Table 2.4. Counts for liver lipid categories by locations.LakeFitzroyBundaberg Hamilton UpperAwoonga RiverPoint Boyne R.Absent 0 0 0 2 3Mild 0 4 8 4 2Moderate 5 2 0 4 2Marked 0 4 2 0 3Summarising by regionsThe means for the locations can be combined into ‘Gladstone’ (Hamilton Point and Upper Boyne River;notably does not include Lake Awoonga) vs. ‘Reference’ (Bundaberg and Fitzroy River), as listed in Table2.5.Table 2.5. Regiona l m eans for the histology ratings. Within trips, significant (P < 0.05) differences arebolded.Trip 1 – T rip 2 –ReferenceGladstoneSig. levelReferenceGladstoneSig.levelCumulative score 8.47 6.39 0.08 6.99 8.19 0.16Gill hyperplasia 2.56 1.99 0.04 2.40 2.80 0.15Gill parasites 2.03 1.57 0.28 2.03 2.55 0.24Liver MMCs 1.66 1.87 0.12 1.52 1.82 0.03Skin lesions 1.25 0.61 0.30 0.69 0.45 0.58Muscle lesions 0.34 0.18 0.48 0.22 0.54 0.163. RESULTS – BULL SHARKSAll 10 sharks were from trip 1, so no trip contrast exists. The single shark from Bundaberg and the fivefrom the Fitzroy River were pooled as the sample for the reference region, and similarly the Gladstoneregion sample consists of the single one from Hamilton Point with the three from the Calliope River.Tables 3.1 and 3.2 list the histology ratings for disease status and regions, respectively. These contrastswereall non‐significant (P > 0.05).132