Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ... Gladstone Fish Health Investigation 2011 - 2012 - Western Basin ...
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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Observational findings Phase 2April <strong>2012</strong>: 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 <strong>2012</strong>: 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 <strong>Gladstone</strong>. 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
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