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

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Figure J. A definite 'thinning out' of barra body condition became more common place by theend of May and by June it was typical to catch escapee barra that looked nothing like theirprime when in Lake AwoongaFigure K. This image shows a mint conditioned Awoonga barramundi.145
Thes e escapee were now also in aworse condition to that of typicalwild stock saltwater barramundi thathave always been known as a 'slim,fit fish'.The tide was definitely turning withthe barramundi beginning to looktatty and no longer carrying that'prime brilliant look' that barra areknow for.By late June most anglers hadreduced their fishing efforts unableto continue to catch barra, day inand day out, mostly governed bywater temperature- even at theGladstone Power Station warmwater outlet it was easy to see lessanglers and less fish being caught,however they were still in strongnumbers but required moreknowledge to catch. Wesuccessfully captured barra allwinter, in great numbers. Guidesexcel while the average anglerstruggles. In this June period it wasnoted that in the 'best paddocks' inthe harbour where forage food wasabundant, the escapee lake fishwere doing the best by retaining themost condition while in other areaswith far less food it was clear to seethe barra were worse off in healthand condition.Figure L. This image shows a typically fit, slim,saltwater wild stock barramundiOne phenomenon I witnessedduring late May was an intensedensity of barramundi north ofGladstone toward Ramsay'scrossing. Over a distance of 2.4nautical miles, barramundicontinually showed on the sounderscreen, rarely a moment passingwith not a fish on the screen. I jigfished barramundi in this deeperarea- no mistake, they werebarramundi. To date, 14/11/2011 theschool has departed; the nomadicways of the barramundi, along withchanging seasons have moved thefish away.146
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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 159 and 160: 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 and 208: To make note - condition loss was e
Page 209: May/June- FinsMy initial observatio
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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