Banksia Beach, Australia
Banksia Beach, Australia

Time filter

Source Type

Dennis M.M.,QML Vetnostics | Dennis M.M.,Ross University School of Medicine | Diggles B.K.,DigsFish Services Pty Ltd | Faulder R.,University of Newcastle | And 5 more authors.
Diseases of Aquatic Organisms | Year: 2016

The objective of this study was to assess the extent and describe the nature of a multispecies marine finfish and crustacean disease event that occurred in Gladstone Harbour, Australia, 2011-2012. Finfish were examined for this study in January to April 2012 from sites where diseased animals were previously observed by the public. Gross abnormalities, including excessive skin and gill mucus, erythema, heavy ecto-parasitism, cutaneous ulceration, corneal opacity, and exophthalmos, were higher (25.5%) in finfish from Gladstone Harbour (n = 435) than in those from an undeveloped reference site, 250 km to the north (5.5%, n = 146, p < 0.0001). Microscopic abnormalities, especially non-infectious erosive to ulcerative dermatitis and internal parasitism, were more prevalent in fish from Gladstone Harbour (n = 34 of 36, prevalence = 94.4%) than in fish from the reference site (3 of 23, prevalence = 13.0% p < 0.0001). The prevalence of shell lesions was higher in mud crabs Scylla serrata sampled from Gladstone Harbour (270 of 718, prevalence = 37.5%) than from the reference site (21 of 153, prevalence = 13.7%; p < 0.0001). The significantly higher prevalence of ulcerative skin disease and parasitism in a range of species suggests affected animals were subjected to influences in Gladstone Harbour that were not present in the control sites. The disease epidemic coincided temporally and spatially with water quality changes caused by a harbour development project. The unique hydrology, geology, and industrial history of the harbour, the scope of the development of the project, and the failure of a bund wall built to retain dredge spoil sediment were important factors contributing to this epidemic. © The authors 2016.


Moravec F.,Academy of Sciences of the Czech Republic | Diggles B.,DigsFish Services Pty Ltd. | Barnes L.,Cardno | Macbeth W.,Cardno
Helminthologia (Poland) | Year: 2014

A new nematode species, Buckleyella ornata n. sp. (Philometridae), is described from female specimens found in the abdominal cavity (mesenteries) of the talang queenfish Scomberoides commersonnianus Lacepède (Carangidae, Perciformes) caught in Darwin Harbour, northern Australia. Based on light and scanning electron microscopical examination, the new species mainly differs from the only other congeneric species B. buckleyi Rasheed, 1963 in having a markedly shorter oesophagus (2.04–2.75 mm long), by the absence of a cephalic mound around the mouth aperture, by the presence of four submedian cephalic papillae of the inner circle, and by a somewhat different arrangement of cuticular ornamentations on the body surface. Three protruding oesophageal teeth and large, dome-shaped cephalic papillae of the external circle present in the smallest gravid female of B. ornata are atrophied in larger conspecific gravid females. Buckleyella ornata is the first known nominal species of a philometrid parasitizing carangid fishes in Australian waters. © 2014, Versita Warsaw and Springer-Verlag Wien.


Acanthocercodes n. g. (Diplectanidae) is proposed for Acanthocercodes bullardi n. sp. and three previously described species of Diplectanum all parasites of the gill lamellae of threadfins (Perciformes: Polynemidae). The new genus is characterised by species having peduncular spines composed of an anteriorly directed point and a flattened base from which an anterior root arises. Members of the genus lack auxiliary spinous or sucker-like structures in the haptor. Acanthocercodes bullardi n. sp. is described from the Atlantic threadfin, Polydactylus octonemus (Girard), in the Gulf of Mexico off Louisiana, USA. Diplectanum polynemus Tripathi, 1957 is redescribed and transferred to Acanthocercodes as A. polynemus (Tripathi, 1957) n. comb. based on specimens collected from the fourfinger threadfin, Eleutheronema tetradactylum (Shaw), from the mouth of the River Adelaide, Northern Territory, Australia. Diplectanum spinosum (Maillard & Vala, 1980) (= Pseudodiplectanum spinosum Maillard & Vala, 1980) and Diplectanum megacirrus (Maillard & Vala, 1980) (= Pseudodiplectanum megacirrus Maillard & Vala, 1980) from the lesser African threadfin, Galeoides decadactylus (Bloch), are transferred to Acanthocercodes as A. spinosum (Maillard & Vala, 1980) n. comb. and A. megacirrus (Maillard & Vala, 1980) n. comb., respectively. © 2015, Springer Science+Business Media Dordrecht.


Moravec F.,Academy of Sciences of the Czech Republic | Diggles B.K.,DigsFish Services Pty Ltd.
Parasitology Research | Year: 2015

A new nematode species, Philometra barnesi sp. n. (Philometridae), is described from the ovary of the marine teleost Pomadasys argenteus (Fosskål) (Haemulidae) off the northern coast of Australia (near Darwin). The new species is characterized by short subequal spicules (84 and 87 μm long), a gubernaculum without a dorsal protuberance at its distal tip, the structure of male anterior and posterior body ends, the body lengths of males (1.67 mm) and gravid females (320–597 mm) and the structure of the oesophagus and caudal end of gravid females. Philometra barnesi is the sixth nominal gonad-infecting species of this genus recorded from marine fishes in Australian waters and the third species of philometrids described from fishes of the family Haemulidae. © 2015, Springer-Verlag Berlin Heidelberg.


Cutmore S.C.,University of Queensland | Diggles B.K.,DigsFish Services Pty Ltd | Cribb T.H.,University of Queensland
Systematic Parasitology | Year: 2016

Four transversotrematid trematodes are reported from commercial teleost species in Australian waters. Transversotrema hunterae n. sp. is described from three species of Sillago Cuvier (Sillaginidae) from Moreton Bay, south-east Queensland. Molecular characterisation using ITS2 rDNA confirmed this stenoxenic specificity of Transversotrema hunterae n. sp., with identical sequence data from Sillago maculata Quoy & Gaimard, S. analis Whitley and S. ciliata Cuvier. Phylogenetic analysis, based on 28S rDNA data, demonstrates that T. hunterae n. sp. belongs to the ‘Transversotrema licinum clade’ and is most closely related to Transversotrema licinum Manter, 1970 and T. polynesiae Cribb, Adlard, Bray, Sasal & Cutmore, 2014, with the three species forming a well-supported clade in all analyses. We extend the known host and geographical ranges of three previously described Transversotrema species, T. licinum, T. elegans Hunter, Ingram, Adlard, Bray & Cribb, 2010 and T. espanola Hunter & Cribb, 2012. The new records represent significant range extensions for the three species and permit further examination of the patterns of biogeographical distribution in Australian waters. Host-specificity of Transversotrema species is examined, and the degree to which morphological analysis can inform taxonomic studies of this group is discussed. © 2016, Springer Science+Business Media Dordrecht.


Moravec F.,Academy of Sciences of the Czech Republic | Diggles B.,DigsFish Services Pty Ltd
Parasitology Research | Year: 2015

A new nematode species, Philometra mirabilis sp. n. (Philometridae), is described based on a subgravid female specimen recovered from the ovary of the freshwater perciform fish Cichla mirianae Kullander and Ferreira (Cichlidae) in the Juruena River (Amazon River basin), State of Mato Grosso, Brazil. The new species is morphologically very different from congeners parasitizing fishes in South America, being mainly characterized by the markedly elongate, narrow body 171 mm long (maximum width/body length 1:598), the presence of three small cone-shaped oesophageal teeth protruding out of the mouth and an onion-shaped oesophageal inflation distinctly separated from the posterior part of the oesophagus, the relative length of the oesophagus, and the rounded posterior end of the body without any caudal projections. It is the third known valid species of Philometra Costa, 1845 parasitizing a freshwater fish in South America and the second species of this genus reported from fishes of the family Cichlidae. © 2015, Springer-Verlag Berlin Heidelberg.


PubMed | DigsFish Services Pty Ltd. and Academy of Sciences of the Czech Republic
Type: Journal Article | Journal: Parasitology research | Year: 2015

A new nematode species, Philometra barnesi sp. n. (Philometridae), is described from the ovary of the marine teleost Pomadasys argenteus (Fosskl) (Haemulidae) off the northern coast of Australia (near Darwin). The new species is characterized by short subequal spicules (84 and 87m long), a gubernaculum without a dorsal protuberance at its distal tip, the structure of male anterior and posterior body ends, the body lengths of males (1.67mm) and gravid females (320-597mm) and the structure of the oesophagus and caudal end of gravid females. Philometra barnesi is the sixth nominal gonad-infecting species of this genus recorded from marine fishes in Australian waters and the third species of philometrids described from fishes of the family Haemulidae.


Diggles B.K.,DigsFish Services Pty Ltd
New Zealand Journal of Marine and Freshwater Research | Year: 2013

Sydney rock oysters (Saccostrea glomerata) were historically abundant throughout the intertidal and subtidal zones of the Pumicestone Passage. However, today subtidal oyster reefs are extinct, and loss of around 96% of the vertical zonation suitable for oyster habitation has occurred. European land use practices caused large increases in sediment flux into inshore regions by 1870. This may explain why subtidal oyster reefs declined after major flood events in the late nineteenth century, associated with infestations by spionid polychaete mudworms. Today, mortalities of S. glomerata in the region are associated with QX disease caused by Marteilia sydneyi. Increased virulence of M. sydneyi is likely due to a combination of increased abundance of intermediate hosts in habitat utilised by oysters, together with immunosuppression of the oysters. These processes are all driven by declining water quality derived from anthropogenic catchment development. Recently expanded marine park sanctuary zones fail to protect the ecosystem against continuing water quality decline. Rehabilitation of the ecosystem will require effective catchment management targeting reductions in nutrient and sediment loading, as well as restoration of oyster reefs using QX-resistant oysters. © 2013 The Royal Society of New Zealand.

Loading DigsFish Services Pty Ltd. collaborators
Loading DigsFish Services Pty Ltd. collaborators