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

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Size structure of mud crabs observed at each site during Phase 1.Legal Male Crabs Large Female Crabs Undersize Crabs90%80%70%60%Percentage50%40%30%20%10%0%Fitzroy River(n = 140)Narrows(n = 607)Port DevelopmentArea(n = 150)LocationCalliope River(n = 108)South Trees Inlet(n = 55)Rodds Bay(n = 375)Figure 17. The size structure of mud crabs observed at each site during the Gladstone Fish HealthMonitoring Program Phase 1, December 2011 – January 2012. Note, (n) refers to the total number ofcrabs examined at each site.Phase 2: During Phase 2, mud crab sampling was conducted between April 2012 and July2012. A total of 1599 crabs were caught, with their size and sex recorded. Results show thata large proportion of the crabs caught within the Gladstone region were undersized crabs(43.59%) (Figure 18). The percentage of undersized crabs varied between sites withinGladstone, with numbers of undersized crabs ranging between 35% (Rodds Bay) and 55%(Port Development Area). The percentage of undersized crabs caught in the Fitzroy Riverand Bundaberg were 49% and 78% respectively (Figure 19).90%80%70%Size structure of mud crabs observed in the Gladstone region and reference sitesduring Phase 2.Legal Male Crabs Large Female Crabs Undersize CrabsPercentage60%50%40%30%20%10%0%Fitzroy River(n = 387)Gladstone(n = 959)Bundaberg(n = 253)LocationFigure 18. The size structure of mud crabs observed in the Gladstone region (sites combined) and thereference sites during the Gladstone Fish Health Monitoring Program Phase 2, April 2012 – July 2012.Note, (n) refers to the total number of crabs examined at each site.39
Size structure of mud crabs observed at each site Phase 2.Legal Male Crabs Large Female Crabs Undersize Crabs90%80%70%60%Percentage50%40%30%20%10%0%Fitzroy River(n = 387)Narrows(n = 147)PortDevelopmentArea(n = 161)Hamilton Point(n = 192)LocationCalliope River(n = 94)Rodds Bay(n = 365)Bundaberg(n = 253)Figure 19. The size structure of mud crabs observed at each site during the Gladstone Fish HealthMonitoring Program, Phase 2, April 2012 – July 2012. Note, (n) refers to the total number of crabsexamined at each site.A notable difference in the size structure between Phase 1 and 2 is the higher proportion ofall crabs caught that were legal male crabs during Phase 1 (summer), highlighting theseasonal nature of the mud crab fishery.The percentage of undersize crabs observed during Phases 1 and 2 of the program is verysimilar to information collected from a long-term, fishery-independent sampling programconducted between 2000 and 2009 along the Queensland coastline where 12 280 crabswere caught and their size and sex recorded. The number of crabs caught within theGladstone region during the fishery independent survey was 1492 with 40.48% undersize( see Figure 20).40
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 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: 4,000Commercial effort (days fished
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
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
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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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