Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ... Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
Conditions observed in mullet sampled at each site Phase 1Skin Colour Normal Skin Minor Redness Skin General Redness Ulceration100908070Number of fish6050403020100Fitzroy(n = 2)Calliope(n = 2)Rodds Bay(n = 110)Bundaberg(n = 35)LocationFigure 27. Conditions observed at each site sampled during Phase 1, September 2011 – January 2012.Note, (n) refers to the total number of fish examined at each site. Some fish may have been observed withmultiple conditions.Conditions observed consisted mostly of minor redness on the ventral surface/pin point redmarks, with a single fish from the Calliope River having significant skin discolouration. Onefish captured in Rodds Bay displayed an ulcerative lesion on the caudal peduncle (Figure28).49
Figure 28. (a) Mullet caught in Rodds Bay displaying minor redness/pinpoint marks on the ventral surfaceand caudal peduncle. The redness around the operculum was a result of the capture by net; (b) Mulletcaught in the Calliope River showing general redness; (c) Mullet caught in Rodds Bay with ulcerativelesion on the caudal peduncle.Histopathology and residue testing Phase 1Only two mullet were examined by necropsy and histology during Phase 1 of theinvestigation. They were submitted by a member of the public from the Gladstone area, butno location was provided. Both fish exhibited skin redness with inflammation of the dermisand loss of epidermis. No bacteria or fungi were present in the skin lesions. Some inorganicsediment was found in association with sloughed epidermal cells and mixed with sloughedcells between gill filaments. A range of minor lesions related to parasites were presentinternally, however these are normal.Mullet from the Kolan River (Bundaberg) and Turkey Beach (Gladstone Harbour) were testedfor chemical residues using gill, liver and muscle tissue from two fish from each site. Themetal concentrations for the reference site (Kolan River) exceed those from Gladstone formost metals (i.e. aluminium, iron, copper, zinc, arsenic, selenium, silver and barium). Othermetals, including lead and mercury, showed no obvious difference between the referenceand Gladstone Harbour sites. No organic chemicals were detected.Observational findings Phase 2Mullet sampling during Phase 2 was conducted in April 2012 and was repeated in June/July2012. The results from these sampling events are recorded below, along with a summary forPhase 2.50
- 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 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: Commercial fishing effort for mulle
- 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
- 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
Conditions observed in mullet sampled at each site Phase 1Skin Colour Normal Skin Minor Redness Skin General Redness Ulceration100908070Number of fish6050403020100Fitzroy(n = 2)Calliope(n = 2)Rodds Bay(n = 110)Bundaberg(n = 35)LocationFigure 27. Conditions observed at each site sampled during Phase 1, September <strong>2011</strong> – January <strong>2012</strong>.Note, (n) refers to the total number of fish examined at each site. Some fish may have been observed withmultiple conditions.Conditions observed consisted mostly of minor redness on the ventral surface/pin point redmarks, with a single fish from the Calliope River having significant skin discolouration. Onefish captured in Rodds Bay displayed an ulcerative lesion on the caudal peduncle (Figure28).49
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