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

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Observational findings Phase 2April 2012: It was difficult to collect large numbers of the candidate species (queenfish) fromall sites during the April sampling period. Consequently, other pelagic species capturedduring sampling were also observed and selected for necropsy examination. Examples ofother pelagic species included grey mackerel, oxeye herring and giant trevally.All fish were observed to have normal skin appearance (no redness). A blue threadfin wasalso caught at the Spoil Ground. Although it might not be considered a pelagic species, itwas observed to have a laceration and was retained for necropsy examination.Four of the five queenfish caught at the Spoil Ground had two to three copepod parasiteseach. Copepods were also present on the queenfish caught offshore from the Fitzroy River.One queenfish caught at Bundaberg had a minor lesion consisting of a small area of scalesmissing.June/July 2012: Queenfish were observed at both the offshore Fitzroy River and Bundabergsites, but were not captured at the Spoil Grounds during the June/July sampling event.Queenfish were captured during netting activities in both the Calliope and Boyne Rivers.Observations of these fish were recorded and included in the results.A gold spot grouper, slate sweetlip and brown sweetlip were caught while sampling the spoilgrounds. These species are all demersal species and were assessed for external signs of illhealth according to the same protocols as all other species. The grouper and sweetlipsappeared to be in good health with no signs of skin discolouration or lesions observed.Queenfish with copepod parasites were observed from all areas except the Calliope River.The single queenfish caught in the Calliope River did have an injury thought to havehappened during the netting process and was classified as a physical injury. While theprevalence of copepods observed on fish from two of the four sites was as high as 100%,most fish only had a few visible copepods present. Other than the presence of the copepodparasites, all fish appeared to be in good condition.Phase 2 summary: Of the 83 pelagic fish observed during Phase 2, only two fish wereobserved with abnormalities including one queenfish with a small area of scales detachedand one queenfish with a physical injury thought to have occurred during capture. Numerousqueenfish were observed to be infected with calanoid copepods both from the reference sitesand Gladstone. It is thought the copepod is a normal parasite for this host, however thenormal parasite prevalence is not known. Results of observations made for pelagic speciesduring Phase 2 are illustrated in Figure 47.69
Conditions observed in pelagic fish species at each site during Phase 2Skin Colour Normal Small area of detached scales Physical damage Copepod parasites observed403530Number of Fish2520151050GreyMackerel(n = 1)Queenfish(n = 12)OxeyeHerring(n = 1)Queenfish(n = 14)Queenfish(n = 4)GiantTrevally(n = 5)Bonito(n = 1)GreyMackerel(n = 4)Queenfish(n = 5)Queenfish(n = 36)Fitzroy RiverCalliopeRiverlower BoyneRiverSpoil GroundsBundabergSpecies and LocationFigure 47. Conditions observed in queenfish and other pelagic species at each site during Phase 2. Note,(n) refers to the total number of fish examined at each site. Some fish may have been observed withmultiple conditions.Histopathology and residue testing Phase 2Tissue samples collected for histopathology and residue testing have been held in archive forfurther investigation if required.Other speciesDuring Phase 1 of the sampling program, a large number of other species were observed, assummarised in Table 2. This included finfish, crustaceans and molluscs. These observationswere made during routine observer trips aboard commercial fishing vessels, as well asduring sampling trips targeting other species using net, trawl and pot fishing apparatus. Theresults of observations and associated pathology on other species is summarised below.ScallopsObservational findingsTargeted sampling of scallops was conducted offshore from Gladstone with a commercialfisher on 29-30 October 2011. Sampling sites included areas adjacent to the Spoil Grounds.Some scallops identified by the fisher as appearing abnormal were preserved forhistopatholgy. Signs of abnormalities included discoloured digestive glands and brittle shells.A sample of scallops was also retained frozen for residue testing.In November 2011, scallops caught in waters offshore of Bundaberg by a commercial fisherwere collected and forwarded to Biosecurity Queensland. These scallops were apparentlyhealthy and were transported fresh for histopathology and residue testing.70
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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
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 and 36: Conditions observed in barramundi s
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: four displayed signs of redness. Th
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
Page 91 and 92: Herring/grinner/Australian threadfi
Page 93 and 94: For example: the third specimen, re
Page 95 and 96: oooGonad - present/absentHepatopanc
Page 97 and 98: Cloudy eye,swollen,redness orhemorr
Page 99 and 100: Red pin pointmarks - nogeneral redn
Page 101 and 102: Lesion photos Description GradeThis
Page 103 and 104: L4continuedoperculumgrazing;cuts or
Page 105 and 106: Appendix A-3: Fish health assessmen
Page 107 and 108: Appendix B - Statistical report: Gl
Page 109 and 110: analyses, but this was not done for
Page 111 and 112: was a significant (P < 0.05) locati
Page 113 and 114: Percentage with fin condition > 015
Page 115 and 116: Table 3.6b. Effects of locations an
Page 117 and 118: Table 3.7d. Spleen categories - cou
Page 119 and 120: 32Bundy2Bundy1UpBoyne1UpBoyne2LwBoy
Page 121 and 122: Table 3.9c. Regional group means an
Page 123 and 124: 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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