Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ... Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
eference sites, 22 mullet (46.81%) displayed external signs of abnormalities and these wereseen during both trips. The conditions observed are summarised in Figure 33.Conditions observed in mullet sampled at each site Phase 225Skin Colour Normal Skin pale pink areas ventrally Skin Minor RednessSkin General redness Cloudy Eye Areas of detached scalesUlceration20Number of fish151050Fitzroy River(n = 21)Calliope River(n = 18)lower Boyne River(n = 20)upper Boyne River(n = 20)Rodds Bay(n = 20)Bundaberg(n = 26)LocationFigure 33. The combined results for conditions observed in mullet at all sites sampled during Phase 2,2012. Note, (n) refers to the total number of fish examined at each site. Some fish may have beenobserved with multiple conditions.In mullet, skin lesions were far less prevalent than barramundi, with only two lesionsrecorded.Laboratory findings Phase 2Collectively, Gladstone sites appeared to contain healthier mullet than the reference sites inApril 2012, but in June/July 2012 the trend was reversed.In April, the only significant differences (P < 0.05) between Gladstone and reference siteswere that Gladstone mullet had significantly lower incidence of skin redness than thereference sites. The cause of the difference is not known. In June/July, fin and kidneyabnormalities were significantly more prevalent in Gladstone sites than reference sites (P
Sharks and raysThe monitoring program collected information on shark species, size, sex, presence andseverity of observed signs of ill health, as well as commercial catch information supplied byfishers via commercial logbooks.During Phase 1, no candidate species of shark had been identified, therefore all sharks andrays encountered during routine, at sea observing or targeted sampling events wereobserved for signs of ill health. During Phase 2, the sampling identified bull sharks as thecandidate species given they were the dominant species in the catch during Phase 1 (Figure34).Figure 34. Bull sharkSampling sites for shark during Phase 1 included the Calliope River, Rodds Bay, SpoilGround and nearby offshore waters, the Narrows, Hamilton Point, the upper and lowerreaches of the Boyne River, as well as the Fitzroy River and Bundaberg (reference sites).Sampling sites for shark during Phase 2 included the Calliope River, Boyne River (upper andlower reaches), Rodds Bay, as well as the Fitzroy River and Bundaberg (reference sites).Commercial catchThe commercial catch of shark species in the Gladstone region (CFish grid S30, as reportedin commercial logbooks for both line and net combined) between 2000 and 2011 peaked in2008 at 157.40 t. The recorded catch then declined sharply to 44.55 t in 2009 and hascontinued to fall to 26.32 t in 2011 (Figure 35). In 2012, minimal catch was reported (0.44 t).54
- 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 and 54: Commercial fishing effort for mulle
- Page 55 and 56: Figure 28. (a) Mullet caught in Rod
- Page 57: June/July: Mullet samples were coll
- 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
- Page 105 and 106: Appendix A-3: Fish health assessmen
- Page 107 and 108: Appendix B - Statistical report: Gl
eference sites, 22 mullet (46.81%) displayed external signs of abnormalities and these wereseen during both trips. The conditions observed are summarised in Figure 33.Conditions observed in mullet sampled at each site Phase 225Skin Colour Normal Skin pale pink areas ventrally Skin Minor RednessSkin General redness Cloudy Eye Areas of detached scalesUlceration20Number of fish151050Fitzroy River(n = 21)Calliope River(n = 18)lower Boyne River(n = 20)upper Boyne River(n = 20)Rodds Bay(n = 20)Bundaberg(n = 26)LocationFigure 33. The combined results for conditions observed in mullet at all sites sampled during Phase 2,<strong>2012</strong>. Note, (n) refers to the total number of fish examined at each site. Some fish may have beenobserved with multiple conditions.In mullet, skin lesions were far less prevalent than barramundi, with only two lesionsrecorded.Laboratory findings Phase 2Collectively, <strong>Gladstone</strong> sites appeared to contain healthier mullet than the reference sites inApril <strong>2012</strong>, but in June/July <strong>2012</strong> the trend was reversed.In April, the only significant differences (P < 0.05) between <strong>Gladstone</strong> and reference siteswere that <strong>Gladstone</strong> mullet had significantly lower incidence of skin redness than thereference sites. The cause of the difference is not known. In June/July, fin and kidneyabnormalities were significantly more prevalent in <strong>Gladstone</strong> sites than reference sites (P
Change language