observations on the pigmentation of the monogeneans, anoplodiscus spp. (family anoplodiscidae) in different microhabitats on their sparid teleost hosts.the monogeneans anoplodiscus australis and a. cirrusspiralis infect the fins of their respective hosts, the yellowfin bream, acanthopagrus australis, and the snapper, pagrus auratus. in these habitats the adult parasite contains melanin-like pigment deposits within the body. very young parasites lack the pigment but deposits of pigment appear and coalesce into dense deposits within the parasite as it grows. the evidence suggests that the pigment is synthesized within the body of the parasite rat ...19921644520
influence of temperature and host species on the development of cryptocaryon irritans.the course of infection of the parasitic ciliate cryptocaryon irritans was followed on lates calcarifer and macquaria novemaculeata at 20 and 25 c. the parasite was originally isolated from locally caught acanthopagrus australis. at 20 c trophonts stayed on the fish longer, tomonts took longer to excyst, and the resulting theronts were larger than at 25 c. on l. calcarifer at 20 c, trophonts grew slowly at first but eventually became significantly larger (mean tomont diameter 466 x 400 microns) ...19968627500
variation in the development of two isolates of cryptocaryon irritans.two isolates of cryptocaryon irritans obtained from acanthopagrus australis from moreton bay (isolate c1) and gymnocranius audleyi from heron island (isolate c2) were passaged on lates calcarifer and macquaria novemaculeata at 20 and 25 c under identical laboratory conditions. there were significant differences between isolates in the diameter of trophonts and tomonts, the incubation period of tomonts, and the length of theronts. trophonts of c1 were significantly larger on l. calcarifer than on ...19968636840
observations on the seasonal occurrence of two species of transversotrematid digenea parasitising the sparid fish acanthopagrus australis in moreton bay, eastern australia.ectoparasitic prototransversotrema steeri angel infected acanthopagrus australis (günther) in western (w. bay) and southern (s. bay) moreton bay with greatest abundance in winter (june-august), and none in summer (december-february). this confirms previous observations on seasonality of p. steeri from a small estuary in new south wales. transversotrema licinum manter, which is a new host and geographical record, infects a. australis in w. bay but not s. bay, with large abundances in summer and w ...19989805784
spatial analysis of stable isotope data to determine primary sources of nutrition for fish.carbon and nitrogen stable isotopes were used to determine the ultimate autotrophic sources supporting production of three commercially important fish species over unvegetated mudflats in a subtropical estuary. mean isotope values over the whole estuary for fish and autotroph sources were modeled to indicate feasible combinations of sources. variability in isotope values among nine locations (separated by 3-10 km) was then used as a further test of the likelihood that sources were involved in fi ...200312774226
monitoring pahs in the brisbane river and moreton bay, australia, using semipermeable membrane devices and erod activity in yellowfin bream, acanthopagrus australis.two water quality monitoring strategies designed to sample hydrophobic organic contaminants have been applied and evaluated across an expected concentration gradient in pahs in the moreton region. semipermeable membrane devices (spmds) that sequester contaminants via passive diffusion across a membrane were used to evaluate the concentration of pahs at four and five sites in spring and summer 2001/2002, respectively. in addition, induction of hepatic cytochrome p4501, erod activity, in yellowfin ...200415172596
release method and anatomical hook location: effects on short-term mortality of angler-caught acanthopagrus australis and argyrosomus field and 3 aquaria experiments were done to quantify the short-term mortality of yellowfin bream acanthopagrus australis and mulloway argyrosomus japonicus after being angled and subjected to 3 general handling treatments. anglers were supplied with identical j-type hooks and asked to handle hooked fish by either (1) physically removing the hook or (2) cutting the line (5 cm from the mouth of the fish) and leaving the hook in. some hooked a. japonicus were subjected to a third handling trea ...200717425260
[anisakis simplex larvae: infection status in marine fishes for sale in shantou].to investigate the infection status of anisakis simplex larvae in marine fishes for sale in shantou.201425223058
reply to pollock (2014) comments on 'saddleback deformities in yellowfin bream, acanthopagrus australis (günther), from south east queensland' by diggles (2013). 201525594432
comments on 'saddleback deformities in yellowfin bream, acanthopagrus australis (günther), from south-east queensland' by diggles (2013). 201525594243
histological identification of osteocytes in the allegedly acellular bone of the sea breams acanthopagrus australis, pagrus auratus and rhabdosargus sarba (sparidae, perciformes, teleostei).the bone of advanced teleost fishes such as those of the family sparidae is said to lack osteocytes or to be acellular. acellularity has been determined by apparent lack of osteocyte lacunae. this study questions the validity of this criterion. scanning electron and light microscopy of paraffin and resin sections were used to show that the sides of sea bream mandibles consist of laminar parallel-fibred bone that we call tubular bone, because it contains tubules, and localised regions of sharpey ...19947818089
structure and origin of the tooth pedicel (the so-called bone of attachment) and dental-ridge bone in the mandibles of the sea breams acanthopagrus australis, pagrus auratus and rhabdosargus sarba (sparidae, perciformes, teleostei).scanning electron and light microscopy were used to show that the pedicels of fish teeth (the so-called "bones of attachment") consist of three types of dentine that lie concentrically around a pulp cavity lined with typical odontoblasts with cytoplasmic processes in dentinal tubules. circumpulpal canalar dentine forms on a thin layer of orthodentine that is encased in mantle dentine. canalar dentine is a new name given to a dentine that is similar to vasodentine in canal arrangement, but not ap ...19948192237
ingestion and ejection of hooks: effects on long-term health and mortality of angler-caught yellowfin bream acanthopagrus australis.ninety juvenile yellowfin bream acanthopagrus australis were angled from holding tanks, allowed to ingest nickel-plated, carbon-steel j-hooks and released (with their lines cut) into individual experimental tanks during 2 experiments in order to assess their (1) long-term (up to 105 d) health, mortality and rate of hook ejection and (2) short- and medium-term (< 42 d) temporal changes in health during hook ingestion. equal numbers of control fish were scooped from holding tanks and similarly mon ...200717425261
spermatozoal ultrastructure of four sparidae fishes: acanthopagrus berda, acanthopagrus australis, lagodon rhomboids and archosargus probatocephus.the mature spermatozoa of two taiwan protandrous hermaphrodite sparidae acanthopagrus berda and acanthopagrus australis are investigated and compared with those of other two sparidae (lagodon rhomboids and archosargus probatocephus) from the western hemisphere. ultrastructurally the spermatozoon of these four species has a spherical, homogeneously electron-dense nucleus with an axial nuclear fossa. the midpiece contains one to four spherical mitochondria and encircles the basal body of the flage ...200515748737
two new hemiurine species (digenea: hemiuridae) from spratelloides robustus ogilby (clupeiformes: clupeidae) off south-western australia and records of parahemiurus merus (linton, 1910) from australian and new caledonian waters.two new species of hemiurine hemiurid are described from spratelloides robustus off woodman point in southern western australia. hemiurus lignator n. sp. differs from its congeners by a combination of similar-sized suckers, long sinus-sac, tandem testes, relatively elongate shape and unthickened seminal vesicle wall. parahemiurus xylokopos n. sp. differs from its congeners in a combination of its squat form, its distinctly lobed vitellarium and the proximity of the gonads to the ventral sucker. ...200515864457
characteristics of an urban fish assemblage: distribution of fish associated with coastal the marine environment, artificial structures are not, in general, managed for their value as habitat and are often built with no a priori expectation as to the assemblages which may colonise them. it may, however, become increasingly important to consider the value of such structures as habitat when decisions are made with respect to the management of artificial structures. this study investigates the role marinas play as habitat for fish by examining the distribution of fish associated with ...200817884158
unicapsula species (myxosporea: trilosporidae) of australian marine fishes, including the description of unicapsula andersenae n. sp. in five teleost families off queensland, australia.a survey of the myxosporean fauna of australian marine fishes revealed the presence of three previously unreported species of unicapsula (multivalvulida: trilosporidae) from sites off southeast queensland, off lizard island on the great barrier reef, queensland, and from jurien bay in western australia. morphometric data (spore, polar capsule and caudal appendage dimensions) combined with bayesian inference and maximum likelihood analyses of small subunit (ssu) and large subunit (lsu) ribosomal ...201323812600
comparative histopathology of longicollum (acanthocephala: pomphorhynchidae) infection in the alimentary tract and spleen of acanthopagrus australis (pisces: sparidae).the pomphorhynchid acanthocephalan longicollum alemniscus infected the rectum of 16 and the intestine of five of 628 acanthopagrus australis from moreton bay, queensland. the neck and proboscis penetrated the entire gut wall and were surrounded by a layer of compact, rounded fibroblasts inside a layer of elongated fibroblasts and scattered connective tissue fibres. these layers extended across the entire gut wall and into the capsule that enclosed the proboscis outside of the gut. a similar para ...19938359988
observations on the attachment by the monogenean, anoplodiscus australis, to the caudal fin of acanthopagrus australis.the unarmed haptor of anoplodiscus australis erodes the epidermis and attaches to the basal lamina above the stratum compactum in the caudal fin of acanthopagrus australis by an eosinophilic, weakly pas-positive and strongly toluidine blue-positive secretion. ultrastructural evidence shows that the adhesive secretion, in the form of rod-shaped bodies, is produced by subtegumentary cells that connect by ducts to the thin, ventral syncytial tegument of the haptor; these bodies pass into the tegume ...19902358313
the rate of development of polylabroides multispinosus (monogenea: microcotylidae) parasitic on the gills of acanthopagrus australis (pisces: sparidae).experiments were done to determine the rate of development of polylabroides multispinosus. eggs hatch after an average 9, 7 and 6 days at 20, 24 and 28 degrees c, respectively. the ciliated oncomiracidium hatched with one pair of clamps (c.p.). juvenile worms less than 3 days post-infection (p.i.) had 2 c.p. and blood and hematin in the simple, saccular gut. the gut bifurcated at 11 c.p. (6-9 days p.i.) (24 degrees c). the genital atrium, testes, ovary and vitellaria appeared at 16 c.p. (8-11 da ...19938314371
the influence of formalin, benzocaine and hyposalinity on the fecundity and viability of polylabroides multispinosus (monogenea: microcotylidae) parasitic on the gills of acanthopagrus australis (pisces: sparidae).adult polylabroides multispinosus exposed in vivo to formalin (200 p.p.m. in sea water, 30 min) deposited a similar number of eggs in 24 h in vitro as did control parasites (sea water, 35 parts per thousand, p.p.t., salinity) and worms exposed in vivo to benzocaine (40 p.p.m. in sea water, 10 min). worms laid more eggs at 30 p.p.t. salinity in vitro than at 20, 35, 10 and 5 p.p.t. salinity (in decreasing order). formalin (200 p.p.m., 30 min) decreased the viability of recently laid eggs, the sur ...19938314372
microhabitats, attachment of eggs and histopathology by the monogenean allomurraytrema robustum on acanthopagrus australis (pisces: sparidae).allomurraytrema robustum occurs normally in low numbers on the jaws, gill arch or upper palate; juveniles also occur on the lateral margins of the gill filaments. at high levels of infection the parasite occurs in large groups (> 30 worms) on the jaws and gill arches, and extends onto the lateral margins of the gill filaments. large numbers of eggs become entangled among these groups of parasites. ciliated oncomiracidia emerge from the eggs. the parasite attaches to the surface of epithelia by s ...19957601587
rain reverses diel activity rhythms in an estuarine teleost.activity rhythms are ubiquitous in nature, and generally synchronized with the day-night cycle. several taxa have been shown to switch between nocturnal and diurnal activity in response to environmental variability, and these relatively uncommon switches provide a basis for greater understanding of the mechanisms and adaptive significance of circadian (approx. 24 h) rhythms. plasticity of activity rhythms has been identified in association with a variety of factors, from changes in predation pre ...201323173211
fish assemblages on estuarine artificial reefs: natural rocky-reef mimics or discrete assemblages?if the primary goal of artificial reef construction is the creation of additional reef habitat that is comparable to adjacent natural rocky-reef, then performance should be evaluated using simultaneous comparisons with adjacent natural habitats. using baited remote underwater video (bruv) fish assemblages on purpose-built estuarine artificial reefs and adjacent natural rocky-reef and sand-flat were assessed 18 months post-deployment in three south-east australian estuaries. fish abundance, speci ...201423755106
assessment of metals in fish from lake macquarie, new south wales, australia.the concentrations of the metals cadmium, copper, mercury, lead, silver, selenium and zinc were measured in the muscle and gonad tissues of five species of fish, yellowfin bream (acanthopagrus australis), silverbiddy (gerres subfasciatus) and trumpeter whiting (sillago maculata), southern log finned goby (favonigobious lateralis), and the halfbridled goby (arenigobius frenatus) from the contaminated lake macquarie nsw and three relatively uncontaminated reference estuaries, wallis lake, port ste ...200817768590
damage and partitioned mortality of teleosts discarded from two australian penaeid fishing gears.six field experiments were perfromed to (1) quantify the scale loss and partitioned (immediate and short-term) mortality of key teleosts discarded from a penaeid seiner and trawler operating in 2 estuaries in southeastern australia, and (2) assess the utility of modified operational and/or onboard handling procedures for maximising survival. for both gears, several non-target species were caught, handled and discarded according to 2 general categories of treatment ('mild' and 'extreme') represen ...200717803103
characterizing the biological traits and life history of acanthopagrus (sparidae) hybrid complexes: implications for conservation and management.this study examined the spatio-temporal reproductive patterns, population structure, maturity and growth of acanthopagrus hybrid complexes, which comprise mainly black bream acanthopagrus butcheri and the hybrids they form with yellowfin bream acanthopagrus australis, in two australian estuaries (coila and brou lakes, nsw). there were no differences between pure a. butcheri and hybrids in terms of their population structure, growth and maturity, suggesting that these two breeds have similar life ...201223020560
saddleback deformities in yellowfin bream, acanthopagrus australis (günther), from south east queensland. 201323121304
interactive drivers of activity in a free-ranging estuarine predator.animal activity patterns evolve as an optimal balance between energy use, energy acquisition, and predation risk, so understanding how animals partition activity relative to extrinsic environmental fluctuations is central to understanding their ecology, biology and physiology. here we use accelerometry to examine the degree to which activity patterns of an estuarine teleost predator are driven by a series of rhythmic and arrhythmic environmental fluctuations. we implanted free-ranging bream acan ...201324260520
effects of mesh size and escape gaps on discarding in an australian giant mud crab (scylla serrata) trap response to concerns over excessive discarding from australian recreational round traps (with four funnel entrances) used to target giant mud crabs, scylla serrata, an experiment was done to assess the independent and cumulative utility of paired, bottom-located horizontal escape gaps (46×120 mm) and increasing mesh size (from 51 to 101 mm). compared to conventional traps comprising 51-mm mesh throughout, those with the same mesh size and escape gaps caught significantly fewer (by 95%) unders ...201425180770
effects of modified handling on the physiological stress of trawled-and-discarded yellowfin bream (acanthopagrus australis).modified handling is often claimed to reduce (sub-)lethal impacts among organisms caught-and-released in fisheries. improving welfare of discarded fish warrants investigation, when their survival is of both economic and ecological importance. in this study, juvenile yellowfin bream (acanthopagrus australis) were trawled in an australian penaeid fishery and then discarded after on-board sorting in either dry or water-filled (modified) trays and with delays in starting sorting of either 2 or 15 mi ...201526098900
udonella myliobati n. comb. (platyhelminthes:udonellidae) and its occurrence in eastern australia.a total of 2,571 of the copepod caligus epidemicus hewitt from the yellow-fin bream, acanthopagrus australis günther, was examined for udonellids. calinella myliobati guberlet, 1936 was found on 3.3% of male copepods and 10.1% of female copepods. a new combination, udonella myliobati (guberlet, 1936) is proposed and its description emended. it differs from the type species udonella caligorum johnston, 1835 (as described by price [1938]) in having a short egg filament and a median genital apertur ...19968973415
contaminants in water, sediment and fish biomonitor species from natural and artificial estuarine habitats along the urbanized gold coast, queensland.metal and pesticide contaminants were measured in water, sediment and fish species in various gold coast waterways, queensland. with the exception of cu, metal concentrations in water, measured using the diffuse gradients in a thin film (dgt) technique, complied with relevant australian guidelines. cu concentrations in these waterways have been related to recreational vessel activities previously. all sediment metal concentrations measured were below the national guidelines, although cu, zn and ...201122030552
gamete compatibility between marine and estuarine acanthopagrus spp. (sparidae) and their hybrids.on australia's south-east coast, hybridization between estuary-restricted black bream acanthopagrus butcheri munro and its migratory coastal congener yellowfin bream acanthopagrus australis (günther) has led to estuarine populations largely composed of hybrids that are most genetically similar to a. butcheri. the fertilization success achieved when ova of estuary-caught a. butcheri were fertilized with the cryogenically preserved sperm of either ocean-caught a. australis or estuary-caught a. but ...201020646166
marine genetic swamping: hybrids replace an obligately estuarine fish.populations of obligately estuarine taxa are potentially small and isolated and may lack genetic variation and display regional differentiation as a result of drift and inbreeding. hybridization with a wide-ranging marine congener should introduce genetic variation and reduce the effects of inbreeding depression and genetic drift. however, high levels of hybridization can cause demographic and genetic swamping. in southeastern australia hybridization occurs between obligately estuarine black bre ...201020070520
mitigating discard mortality from dusky flathead platycephalus fuscus gillnets.the mortalities and contributing parameters were estimated for key species discarded during commercial gillnetting (80 mm mesh) targeting dusky flathead platycephalus fuscus in a southeastern australian estuary. bycatches (1470 individuals from 16 species over 11 deployments) were assessed for their immediate mortalities onboard the gillnetter, before subsamples (570 individuals from 11 species) were discarded into cages and monitored for their short-term fate over 4 d. appropriate controls were ...200919694175
evolutionary impacts of hybridization and interspecific gene flow on an obligately estuarine fish.for free-spawning estuarine taxa, gene flow among estuaries may occur via hybridization with mobile congeners. this phenomenon has rarely been investigated, but is probably susceptible to anthropogenic disturbance. in eastern australia, the estuarine black bream acanthopagrus butcheri and marine yellowfin bream acanthopagrus australis have overlapping distributions and the potential to hybridize. we used surveys of microsatellite and mtdna variation in 565 adults from 25 estuaries spanning their ...200918800995
mortality of discards from southeastern australian beach seines and gillnets.two experiments were done in an australian estuary to quantify the mortalities and contributing factors for key species discarded during 8 and 9 deployments of commercial beach (or shore) seines and gillnets, respectively. in both experiments, bycatches (2347 individuals comprising 16 species) were handled according to conventional practices and assessed for immediate mortalities before live samples of selected species were discarded into replicate cages along with appropriate controls, and moni ...200818714684
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