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

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Weight (tonnes)180160140120100806040200Commercial shark catch for the Gladstone region2000-20122000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012YearFigure 35. The annual catch of shark from the Gladstone region (CFish grid S30), as reported incommercial fisher logbooks (calendar years 2000 – 2011). Data includes both line and net catch for theregion combined.Commercial fishing effort for sharks in the Gladstone region (days fished with shark catchrecorded) has varied since 2000 and follows a similar trend to catch with a peak of 706 daysin 2008. In recent years, there has been a decline in the number of fishers recording sharkcatch from a peak in 2004 (34 fishers) to 2011 (14 fishers) (Figure 36). Effort recorded vialogbooks for 2012 is very low, with only five fishers recording shark catch for a total of 11days fishing.800Commercial effort (days fished) for shark in Gladstone region2000-2012700600500Days40030020010002000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012YearFigure 36. The number of days fishing where commercial fishers have reported shark catch from theGladstone region (CFish grid S30), as reported in commercial fisher logbooks (calendar years 2000 –2011). Data includes both line and net effort for the region combined.55
Observational findings Phase 1Phase 1 sampling of sharks included observations made between September 2011 andFebruary 2012 across a range of species (227 sharks and rays). Table 9 lists the number ofeach species encountered during targeted sampling events or during routine, at-seaobserving trips.Table 9. The sharks and rays observed during Phase 1.SpeciesNumberBlacktip whaler complex (Carcharhinus limbatus & Carcharhinus tilstoni) 45Bull shark (Carcharhinus leucas) 65Creek whaler (Carcharhinus fitzroyensis) 5Eagle ray (Myliobatidae sp.) 3Giant shovelnose (Rhinobatos typus) 1Graceful shark (Carcharhinus amblyrhynchoides) 3Grey carpet shark (Chiloscyllium punctatum) 2Lemon shark (Negaprion acutidens) 18Milk shark (Rhizoprionodon acutus) 22Narrow sawfish (Anoxypristis cuspidatus) 2Pigeye shark (Carcharhinus amboinenis) 5Scalloped hammerhead (Sphyrna lewini) 7Sharks unidentifed in field (Carcharhinus spp.) 31Spinner shark (Carcharhinus brevipinna) 2Spot-tail shark (Carcharhinus sorrah) 1Stingrays (Dasyatis spp.) 2Weasle shark (Hemigaleus australiensis) 2Whitecheek shark (Carcharhinus coatesi) 1Whitespotted guitarfish (Rhynchobatus australiae) 9Zebra shark (Stegostoma fasciatum) 1Total 227During September 2011, nine sharks caught in the Fitzroy River by a commercial fisher wereobserved to be in good health. The sharks comprised a number of species, including bullsharks (2), creek whalers (3), pigeye sharks (3) and a blacktip whaler.A total of 87 sharks and rays were sampled in October and November 2011 from a range ofsites including the Fitzroy River (5), Narrows (1), Calliope River (16), Gladstone Harbour(21), Rodds Bay (43) and Bundaberg (1). Sharks showed a range of abnormal conditionsthroughout the study area, including the reference sites. A number of sharks showed varyingdegrees of skin redness generally on the flanks and underside of the body. Although thecause of the redness is unknown, sharks can display varying levels of red, discoloured skindepending on the length of time in the net and post-harvest handling. One stingray wascaught during a trawl survey that had an injured, shortened tail with the barb missing.A number of sharks also had areas of lighter skin discolouration, particularly between the firstand second dorsal fins. Closer examination revealed the placoid scales (tough modifiedscales found on sharks and rays) were absent, exposing the underlying layers of skin(epidermis and dermis). Some of these areas were bleeding and appeared to haveassociated scratch marks. Many of these sharks were observed to have numerous flatworm56
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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
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 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: Sharks and raysThe monitoring progr
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
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
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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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