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

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During late March escapee fish captured in the harbour that were kept for the table hadstarted roe development for a possible late spawning due to high water temperatures inMarch. Barramundi frames including these roe developments were handed to Bill Sawynokfor further analysis. The weather cooled immediately after these findings and no further roedevelopments were found. (The coming three months Nov, Dec, 2010 and Jan, <strong>2011</strong> willoffer better information on escapee barra spawn possibilities).April- BoomingBy the 1st April I had personally caught tagged barramundi over 51km from the AwoongaDam wall (south to Bird Island, Rodd's Bay) Tag data showed place of origin was from LakeAwoonga. (See image A 1).Charter and personal trips produced numerous saltwatercaught, tagged barra, originally from Awoonga. Vastschools of barra had moved away from the Boyne and welure caught hundreds of fish in this 50km southern zone andmy predictions had some of these fish ending up in theGreat Sandy Straights, well to the south. ( currently14/11/<strong>2011</strong> there has been recorded tag data fromAwoonga barramundi captured in the Burnett River,Bundaberg, approximately 174 km south) so the trend forwide spread movement is frimly documented.Figure G Nice BarraAt this stage (late April) during the time line it was lookingfine, barramundi were being caught from the freshwaterreaches of the Boyne, the harbour and now in numerousreaches of estuary systems over big areas. Somesensational lure fishing was still being had in the lowerBoyne River whilst commercial netters still worked outsidethe mouth. By mid April it was obvious that barramundiwere scattered over large distances of coast line creatingimpressive fisheries for both rec and commercial anglers.I joined Dr Ben Diggles and Kurt Hutchbyfrom GAWB on a science trip below the damwall to catch by line as many barra aspossible and check each one for health anddisease.Figure H. There were numerous issuesnoted by Dr Ben Diggles143
May/June- FinsMy initial observations were of anal fins andthe tips of barra tails eroding away or beingeaten away during the month of May.Photographs of this occurrence wereimmediately sent to both Bill Sawynok andDr Ben Diggles for comment.Also a few barra with caligid copepods aswell as a form of mucus or a monogeneanparasites were captured- photos also sent toDr B. Diggles for identification.Figure I. Tail Fins of Barramundi and barramundi caligid copepods144
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Department of Agriculture, Fisherie
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ContentsTable of tables 1Table of f
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Mullet (Mugilidae) 80Banana prawn (
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Figure 7. Barramundi caught in the
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Figure 38. Sharks caught in the Cal
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Phase 1 (August 2011-February 2012)
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The results in this study support t
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ecognised expertise and research pu
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Mr Mitchell reported high catches u
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Figure 2. Sampling sites within the
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Phase 2: Expanded Gladstone Fish He
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Mud crab (Scylla serrata): Mud crab
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For mud crabs, hepatopancreas, gill
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Table 2. The number of fish, crusta
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Significant findings and discussion
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Commercial barramundi catch and cat
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Figure 6. Eye condition observed in
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Conditions observed in barramundi s
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Figure 12. A barramundi caught in t
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provided another environmental stre
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was somewhat reduced because post-m
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4,000Commercial effort (days fished
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Size structure of mud crabs observe
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Figure 21. Examples of shell abnorm
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Of the 58 crabs observed to have sh
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HistopathologyLipid storage vacuola
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Commercial fishing effort for mulle
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Figure 28. (a) Mullet caught in Rod
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June/July: Mullet samples were coll
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Sharks and raysThe monitoring progr
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Observational findings Phase 1Phase
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Encysted larval parasites were foun
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in particular bull sharks, have bee
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Commercial banana prawn catch for t
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Observational findings Phase 2April
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Laboratory testing Phase 1Seven riv
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four displayed signs of redness. Th
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Conditions observed in pelagic fish
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FinfishObservational findingsDuring
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ConclusionsIn 2011, a wide range of
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Mud crabsFisheries Queensland did n
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Owens, L. 1983. Bopyrid isopod Epip
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Candidate speciesThe monitoring pro
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Table 1: Candidate species for each
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Sample processingSample processing
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Herring/grinner/Australian threadfi
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For example: the third specimen, re
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oooGonad - present/absentHepatopanc
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Cloudy eye,swollen,redness orhemorr
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Red pin pointmarks - nogeneral redn
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Lesion photos Description GradeThis
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L4continuedoperculumgrazing;cuts or
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Appendix A-3: Fish health assessmen
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Appendix B - Statistical report: Gl
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analyses, but this was not done for
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was a significant (P < 0.05) locati
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Percentage with fin condition > 015
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Table 3.6b. Effects of locations an
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Table 3.7d. Spleen categories - cou
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32Bundy2Bundy1UpBoyne1UpBoyne2LwBoy
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Table 3.9c. Regional group means an
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Table 4.2c. Effects of locations an
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4.5 Summarising by regionsThe means
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Ta ble 5.2a. Effects of locations a
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5.5 Summarising by regionsThe means
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6.3 ResultsThere was no significant
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Table 6.5 lists the mean values whe
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Standardized residualsStandardized
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Table 2.3f. Muscle lesions.Lake Fit
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Table 4. 1f. Muscle lesions.Fitzroy
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Table 5.6. Regiona l m eans for the
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Contaminants in Tissue ofFish and C
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Contaminants in Tissue of Fish and
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Department of Science, Information
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Page 157 and 158: Department of Science, Information
Page 203 and 204: Appendix E - Time line BarraBy John
Page 205 and 206: friends. Rapidly rising flood water
Page 207: To make note - condition loss was e
Page 211 and 212: Thes e escapee were now also in awo
Page 213 and 214: Figure N. Barramundi showing net ma
Page 215 and 216: September- Deaths and SicknessFigur
Page 217 and 218: There is numerous distinguishing fe
Page 219: Department of Agriculture, Fisherie
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Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...

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