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

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Most barramundi sampled in Gladstone in June/July were considered to be in goodcondition. The majority of skin discolouration or lesion conditions observed during June/Julywere from barramundi caught in the Fitzroy River and were represented by red pin pointmarks, individual scales detached or those attributed to physical injuries (Figure 13).Figure 10. A barramundi caught in the Boyne River during the June/July 2012 sampling event withrecovering injuries to the jaw and body.Figure 11. A barramundi caught in the Burnett River, Bundaberg, during the June/July 2012 samplingevent with an old injury in an advanced stage of healing. Note the new skin completely covering the oldinjury with new scales forming over the affected area.31
Figure 12. A barramundi caught in the Calliope River during the June/July 2012 sampling event with anold injury in an advanced stage of healing. Note the new skin completely covering the old injury.Conditions observed in barramundi sampled at each site during June/July, Phase 2Skin Colour Normal Skin Pale Pink Areas Ventrally Skin Minor Redness Skin General rednessSkin Extensive Redness Minor Lesion Areas of detached scales Physical Damage3025Number of Fish20151050Fitzroy River(n = 35)Hamilton Point(n = 20)Calliope River(n = 13)lower Boyne River(n = 10)upper Boyne River(n = 6)Rodds Bay(n = 2)Bundaberg(n = 7)LocationFigure 13. Conditions observed (skin colour and lesions) in barramundi sampled at each site duringJune/July, Phase 2. Note, (n) refers to the total number of fish examined at each site. Some fish may havebeen observed with multiple conditions.Targeted barramundi surveys to examine Neobenedenia sp. infectionTargeted barramundi surveys in the Boyne River were undertaken by Fisheries Queenslandin October 2011 and September 2012 to investigate parasitism by the monogeneanNeobenedenia sp. Neobenedenia had been implicated as a causative agent for some of theobserved conditions affecting barramundi during Phase 1 of the fish health investigation.Neobenedenia is known to exist naturally in the marine environment in the Gladstone areagiven previous occurrences of Neobenedenia on barramundi broodstock in the GladstoneArea Water Board fish hatchery (pers. comm. Kirt Hutchby, Hatchery Manager).Neobenedenia does not survive in freshwater.Neobenedenia are known to cause disease and mortalities in aquaculture. Deveney et al.(2001) documented an outbreak of Neobenedenia that occurred in the Hinchinbrook Channelon barramundi cultured in sea cages where parasite burdens exceeded 400 specimens perfish, however these parasites have not previously been associated with documented fishhealth issues in wild populations.32
Page 1 and 2: Department of Agriculture, Fisherie
Page 3 and 4: ContentsTable of tables 1Table of f
Page 5 and 6: Mullet (Mugilidae) 80Banana prawn (
Page 7 and 8: Figure 7. Barramundi caught in the
Page 9 and 10: Figure 38. Sharks caught in the Cal
Page 11 and 12: Phase 1 (August 2011-February 2012)
Page 13 and 14: The results in this study support t
Page 15 and 16: ecognised expertise and research pu
Page 17 and 18: Mr Mitchell reported high catches u
Page 19 and 20: Figure 2. Sampling sites within the
Page 21 and 22: Phase 2: Expanded Gladstone Fish He
Page 23 and 24: Mud crab (Scylla serrata): Mud crab
Page 25 and 26: For mud crabs, hepatopancreas, gill
Page 27 and 28: Table 2. The number of fish, crusta
Page 29 and 30: Significant findings and discussion
Page 31 and 32: Commercial barramundi catch and cat
Page 33 and 34: Figure 6. Eye condition observed in
Page 35: Conditions observed in barramundi s
Page 39 and 40: provided another environmental stre
Page 41 and 42: was somewhat reduced because post-m
Page 43 and 44: 4,000Commercial effort (days fished
Page 45 and 46: Size structure of mud crabs observe
Page 47 and 48: Figure 21. Examples of shell abnorm
Page 49 and 50: Of the 58 crabs observed to have sh
Page 51 and 52: HistopathologyLipid storage vacuola
Page 53 and 54: Commercial fishing effort for mulle
Page 55 and 56: Figure 28. (a) Mullet caught in Rod
Page 57 and 58: June/July: Mullet samples were coll
Page 59 and 60: Sharks and raysThe monitoring progr
Page 61 and 62: Observational findings Phase 1Phase
Page 63 and 64: Encysted larval parasites were foun
Page 65 and 66: in particular bull sharks, have bee
Page 67 and 68: Commercial banana prawn catch for t
Page 69 and 70: Observational findings Phase 2April
Page 71 and 72: Laboratory testing Phase 1Seven riv
Page 73 and 74: four displayed signs of redness. Th
Page 75 and 76: Conditions observed in pelagic fish
Page 77 and 78: FinfishObservational findingsDuring
Page 79 and 80: ConclusionsIn 2011, a wide range of
Page 81 and 82: Mud crabsFisheries Queensland did n
Page 83 and 84: Owens, L. 1983. Bopyrid isopod Epip
Page 85 and 86: Candidate speciesThe monitoring pro
Page 87 and 88:
Table 1: Candidate species for each
Page 89 and 90:
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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Appendix E - Time line BarraBy John
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friends. Rapidly rising flood water
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To make note - condition loss was e
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May/June- FinsMy initial observatio
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Thes e escapee were now also in awo
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Figure N. Barramundi showing net ma
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September- Deaths and SicknessFigur
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There is numerous distinguishing fe
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Department of Agriculture, Fisherie
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Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...

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