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

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Samples were tested for more than 160 organic chemicals. Only two organic chemicals weredetected in the fish samples analysed. These were p’p’-DDE and DEET. p’p’-DDE is adegradation product of the organochlorine pesticide DDT, which was a commonly usedpesticide in the agricultural sector, but has not been permitted in Australia for more than 20years. The samples were from barramundi from China Bay and Turkey Beach in Gladstone.DEET is a very commonly used ingredient in personal insect repellents. Given that it wasfound in only one sample, it is possible that this fish sample may have been contaminated.Concentration of metals, aluminium, barium, copper and zinc were slightly higher in the fishtissue from the reference sites than Gladstone Harbour sites. Cadmium, nickel, selenium andsilver were very similar among sites. Iron and arsenic were present at higher levels in theGladstone barramundi population. Further details can be found atwww.qld.gov.au/gladstoneharbourObservational findings Phase 2April 2012: A total of 111 barramundi were collected from all planned netting sites. NoNeobenedenia sp. or eye abnormalities were observed on fish collected from any of thesampling locations. In the Boyne River, a high prevalence (50-75%) of physical damage wasobserved on the barramundi caught. Conditions described as physical damage appeared asgraze–type injuries and included large areas of scale loss often on one side of the body,operculum damage and some mandible fractures. Physical damage (Figure 7) was attributedto fish passing over the Awoonga spillway earlier this year (Awoonga overtopped in lateJanuary to early February and late March 2012). The observed damage is consistent withinjuries seen in fish after being washed over spillways of other impoundments, andconsistent with observations made by recreational anglers following the 2011 overtopping ofAwoonga Dam.Seven barramundi caught at the reference sites and six barramundi caught in the Gladstonearea (Hamilton Point and Rodds Bay) showed varying levels of redness on the skin. Thisranged from pinpoint marks to more general redness over areas of the body and fins. Noother signs of ill health were observed, with most fish considered to be in good condition.Observations are summarised in Figure 8.Seven barramundi were caught incidentally during trawl sampling in Gladstone Harbour(Figure 9). The commercial fisher involved in the sampling identified this as an unusualcapture, which may indicate a larger number of barramundi than normal being present inGladstone Harbour. No significant signs of ill health were observed on these barramundi.Figure 7. Barramundi caught in the Boyne River showing physical damage consistent with beingwashed over the Awoonga spillway.29
Conditions observed in barramundi sampled at each site during April, Phase 2Skin Colour Normal Skin Minor Redness Skin General rednessSkin Extensive Redness Minor Lesion Physical Damage3530Number of Fish2520151050Fitzroy(n = 33)Hamilton Point(n = 11)Calliope(n = 10)lower Boyne River(n = 22)upper Boyne River(n = 15)Rodds Bay(n = 7)Bundaberg(n = 13)LocationFigure 8. Conditions observed (skin colour and lesions) in barramundi sampled at each site during April2012, Phase 2. Note, (n) refers to the total number of fish examined at each site. Some fish may have beenobserved with multiple conditions.Figure 9. Barramundi caught while trawling in the Gladstone Harbour.June/July 2012: A total of 93 barramundi were collected from all planned netting sites. NoNeobenedenia or eye conditions were observed on barramundi at any of the samplinglocations.Most notable in the barramundi samples collected was the presence of two fish from theupper Boyne River showing recovering lesions. The lesions were well infiltrated withconnective tissue, indicating recovery from injuries that have occurred at least one monthago, as described by the attending veterinarian. The recovering injuries observed in thesefish were consistent with the fresh injuries observed on fish during the April/May samplingevent in the Boyne River, which were attributed to fish passing over the Awoonga Damspillway in late January to early April 2012 (see Figure 10).Barramundi were also caught in the Calliope and Burnett Rivers with injuries in advancedstages of healing. New skin had completely covered the old injuries and new scales wereforming over the affected areas (see Figures 11 and 12). Given the advanced stage of thehealing, it is believed these injuries did not happen during 2012.30
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: Figure 6. Eye condition observed in
Page 37 and 38: Figure 12. A barramundi caught in t
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
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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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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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