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

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Barra have been caught on lines for decades, across the country with occassional eyedamage or in worst case- no eyes). Their ability to hunt by using vibration and sound tolocate food source is a key to their survival without any eyes....... in those individual cases,unrelated to this current eye problem in some escapee Awoonga barramundi.Eye damage wasn't common in our line caught specimens, but may have been morecommon than our catch rates dictated. Ill or suffering fish may not have been eating asmuch, if at all. What was again obvious and common was skinny fish, tattered fins and theloss of that glossy gleaming iconic barra glint. The fish were more dull and the body slimeseemed more whitish rather than opaque.Figure P. Barramundi with blemishes on skin and fins described below.Blemishes on the skin and fins were more frequent and many captures of escapee lake fishhad some kind of sign of deteriorating condition/health. At this point in time one of my closefishing companions and I discussed if these fish would ever regain their condition again orcontinue downhill until death. For every story of 'doom and gloom escapee barra caught' wealso had stories of escapee barra from other areas within the harbour that were in way bettercondition. During July and early August I did manage to dive numerous times and film in thelower Boyne River in winter waters ( cleaner) to observe hundreds of barramundi with manyof these fish having hollow stomachs.( concave bellies) At no stage during diving orcharter/personal barra fishing in the lower Boyne ( mouth to 1st bridge) did I notice thepoorer quality fish found from areas like the mid Calliope River, however in the upperreaches of the Boyne River's tidal extremities there were multiple cases of dead barra, sickbarra, and dying barra in August.149
September- Deaths and SicknessFigure Q. Dead barramundiIn September in the upper tidal reaches of the Boyne there were dead barra, dying barra,dead bream, dying bream, dead mullet, dying mullet, dead catfish, dying catfish as well as adying King Threadfin salmon noticed all on the same day. For a succession of days most ofthese species were again seen struggling, or dead. ( King salmon spotted only oncecoveredin a fungus or mucus or something) My observations labelled that section of wateras the warmest in the region, which was warmer than the hot water outlet in the CalliopeRiver. From memory and notes it cloked 80 degrees F which was up to 8 degrees F warmerthan other areas. It was common to see discoloured barramundi from this region, their headsand bodies covered in a white growth as well as green moss/alge growing on their bodies inplaces. I was still guiding clients in the area until the Harbour Closure mid September. I wasglad to stop fishing in there as touching the fish was a great concern to me and for thewelfare of my clients. We never captured a fish in that area that I considered 100% healthynor in good condition. Some were rakey, skinny, tattered, rough looking barramundi.150
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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 163 and 164: 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 and 210: May/June- FinsMy initial observatio
Page 211 and 212: Thes e escapee were now also in awo
Page 213: Figure N. Barramundi showing net ma
Page 217 and 218: There is numerous distinguishing fe
Page 219: Department of Agriculture, Fisherie
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