Relevant bibliographies by topics / Maccullochella macquariensis

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  2. Dissertations / Theses

Academic literature on the topic 'Maccullochella macquariensis'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Maccullochella macquariensis"

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Douglas, JW, GJ Gooley, BA Ingram, ND Murray, and LD Brown. "Natural hybridization between Murray cod, Maccullochella peelii peelii (Mitchell) and trout cod, Maccullochella macquariensis (Cuvier) (Percichthyidae) in the Murray River, Australia." Marine and Freshwater Research 46, no. 4 (1995): 729. http://dx.doi.org/10.1071/mf9950729.

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Hybridization is confirmed between two wild, naturally sympatric populations of Murray cod, Maccullochella peelii peelii, and trout cod, M. macquariensis, from the Murray River, Australia. Electrophoretic comparisons of proteins in muscle and liver tissues from trout cod, Murray cod, an artificially produced hybrid of Murray cod and trout cod, and putative wild hybrids from the Murray River indicated that the last group were first-generation interspecific hybrids. This is the first record of hybridization between naturally occumng populations of these two species. Naturally occurring wild populations of both trout cod and Murray cod are nonetheless genetically distinct and there is no evidence of introgression between the species. These findings have some implications for management policies and practices in relation to both species, and these are discussed.
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Nicol, Simon J., Richard J. Barker, John D. Koehn, and Mark A. Burgman. "Structural habitat selection by the critically endangered trout cod, Maccullochella macquariensis, Cuvier." Biological Conservation 138, no. 1-2 (August 2007): 30–37. http://dx.doi.org/10.1016/j.biocon.2007.03.022.

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Lyon, Jarod P., Charles Todd, Simon J. Nicol, Alasdair MacDonald, Daniel Stoessel, Brett A. Ingram, Richard J. Barker, and Corey J. A. Bradshaw. "Reintroduction success of threatened Australian trout cod (Maccullochella macquariensis) based on growth and reproduction." Marine and Freshwater Research 63, no. 7 (2012): 598. http://dx.doi.org/10.1071/mf12034.

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Internationally, re-introductions of endangered species into their former ranges have largely failed. Here we assess a successful reintroduction program of the endangered trout cod (Maccullochella macquariensis) and examine factors contributing to this success. Stocking of marked fish (all stocked fish were marked) occurred between 1997 and 2006 in the Ovens River, south-eastern Australia, where trout cod were historically abundant but locally extinct by the 1980s. We found no natural recruits (i.e. from spawnings of stocked fish in the wild) over the age of six, indicating that natural recruitment started at most five years after stocking began. Of the 83 fish we examined for sexual maturity, 12 were immature, 20 were male, and 51 were female. The body length at which 50% of the population can be considered mature was 325 and 250 mm for females and males, respectively. The length at which 90% of the population was mature was 394 and 318 mm for females and males, respectively. The smallest mature female was 245 mm. Average relative fertility was 9 eggs g–1 fish weight. The results we obtained provide valuable insights into the aspects contributing to the success of reintroduction programs for endangered freshwater species.
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Growns, Ivor, Ian Wooden, and Craig Schiller. "Use of instream wood habitat by Trout Cod Maccullochella macquariensis (Cuvier) in the Murrumbidgee River." Pacific Conservation Biology 10, no. 4 (2004): 261. http://dx.doi.org/10.1071/pc040261.

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Microhabitat use of instream wood habitat by Trout Cod Maccullochella macquariensis (Cuvier), a critically endangered species with a restricted distribution, was examined in the Murrumbidgee River in New South Wales, Australia. Habitat variables were scored or measured at 100 m intervals along the river or wherever Trout Cod were captured using electrofishing. The occurrence of Trout Cod was significantly dependent on the presence of instream woody habitat and 95% of samples where trout cod were caught were associated with the presence of woody habitat. Trout Cod were more likely to be found on simply-structured woody habitats, away from the river-bank and their abundance showed no relationship with water velocity. The low abundance of other fish species at the sampling sites suggests that the relationships demonstrated are not due to inter-species interactions. The results will assist with specific management actions to restore and protect populations of this endangered species.
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Ebner, B. C., L. Johnston, and M. Lintermans. "Radio-tagging and tracking of translocated trout cod (Maccullochella macquariensis: Percichthyidae) in an upland river." Marine and Freshwater Research 60, no. 4 (2009): 346. http://dx.doi.org/10.1071/mf08257.

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Radio-tracking provides an effective means of studying the spatial ecology of threatened fishes where almost inaccessible habitats and species rarity render conventional mark–recapture methods impractical. Initially, validation of an effective radio-tagging method is required; in the present study, an aquaria trial based on nine hatchery-reared, adult male Maccullochella maquariensis (Percichthyidae) was conducted. Fish resumed feeding within days of being internally implanted with a radio-tag, and tag rejection was not observed (0%, n = 9) based on a 2-month observational period. Following release into an upland stream, individual-specific movements resulted in upstream (n = 1) and downstream (n = 6) dispersal as well as fidelity to the release site (n = 2) at the completion of the study. Individuals established small home-ranges (mean length of river used by an individual per diel period ranged from 47 to 292 m) and were most active in the early morning and evening (n = 6). Complete survivorship of individuals bearing active radio-transmitters (n = 8) was recorded up until 4 months after release. However, an estimated zero or one individual was alive when the last active radio-tag expired 11 months after release (n = 8). The present study highlights the use of radio-tracking in monitoring the dispersal and survivorship of small numbers of hatchery-reared threatened fish released into natural habitats as part of species re-introduction programs.
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Todd, Charles R., Simon J. Nicol, and John D. Koehn. "Density-dependence uncertainty in population models for the conservation management of trout cod, Maccullochella macquariensis." Ecological Modelling 171, no. 4 (February 2004): 359–80. http://dx.doi.org/10.1016/j.ecolmodel.2003.06.002.

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Lyon, Jarod P., Tomas Bird, Simon Nicol, Joanne Kearns, Justin O’Mahony, Charles R. Todd, Ian G. Cowx, and Corey J. A. Bradshaw. "Efficiency of electrofishing in turbid lowland rivers: implications for measuring temporal change in fish populations." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 6 (June 2014): 878–86. http://dx.doi.org/10.1139/cjfas-2013-0287.

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To quantify how electrofishing capture probability varies over time and across physiochemical and disturbance gradients in a turbid lowland river, we tagged between 68 and 95 fish·year−1 with radio transmitters and up to 424 fish·year−1 with external and passive integrated transponder (PIT) tags. We surveyed the site noninvasively using radiotelemetry to determine which of the radio-tagged fish were present (effectively closing the radio-tagged population to emigration) and then electrofished to estimate the proportion of available fish that were captured based on both this and standard mark–recapture methods. We replicated the electrofishing surveys three times over a minimum of 12 days each year, for 7 years. Electrofishing capture probability varied between 0.020 and 0.310 over the 7 years and between four different large-bodied species (Murray cod (Maccullochella peelii), trout cod (Maccullochella macquariensis), golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus)). River turbidity associated with increased river discharge negatively influenced capture probability. Increasing fish length increased detection of fish up to 500 mm for Murray cod, after which capture probability decreased. Variation in capture probability in large lowland rivers results in additional uncertainty when estimating population size or relative abundance. Research and monitoring programs using fish as an indicator should incorporate strategies to lessen potential error that might result from changes in capture probabilities.
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Gunasekera, R. "The amino acid profiles in developing eggs and larvae of the freshwater Percichthyid fishes, trout cod, Maccullochella macquariensis and Murray cod, Maccullochella peelii peelii." Aquatic Living Resources 12, no. 4 (August 1999): 255–61. http://dx.doi.org/10.1016/s0990-7440(00)86636-x.

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Gunasekera, R. "Early ontogeny-related changes of the fatty acid composition in the Percichthyid fishes trout cod, Maccullochella macquariensis and Murray cod, M. peelii peeliiModification de la composition en acides gras durant le développement ontogénique (œufs et larves) chez les poissons Percichthyidés, Maccullochella macquariensis et Maccullochella peelii peelii." Aquatic Living Resources 12, no. 3 (June 1999): 219–27. http://dx.doi.org/10.1016/s0990-7440(00)88472-7.

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Koehn, John D., Mark Lintermans, Jarod P. Lyon, Brett A. Ingram, Dean M. Gilligan, Charles R. Todd, and John W. Douglas. "Recovery of the endangered trout cod, Maccullochella macquariensis: what have we achieved in more than 25 years?" Marine and Freshwater Research 64, no. 9 (2013): 822. http://dx.doi.org/10.1071/mf12262.

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Recovery of threatened species is often necessarily a long-term process. The present paper details the progress towards the recovery of trout cod, Maccullochella macquariensis, an iconic, long-lived fish species first listed as threatened in the 1980s. The objectives, actions and progress over three successive national recovery plans (spanning 18 years) are assessed, documenting changes to population distribution and abundance and updating ecological knowledge. Increased knowledge (especially breeding biology and hatchery techniques, movements, habitats and genetics) has greatly influenced recovery actions and the use of a population model was developed to assist with management options and stocking regimes. Key recovery actions include stocking of hatchery-produced fish to establish new populations, regulations on angling (including closures), education (particularly identification from the closely related Murray cod, M. peelii) and habitat rehabilitation (especially re-instatement of structural woody habitats). In particular, the establishment of new populations using hatchery stocking has been a successful action. The importance of a coordinated long-term approach is emphasised and, although there is uncertainty in ongoing resourcing of the recovery program, much has been achieved and there is cautious optimism for the future of this species.
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Dissertations / Theses on the topic "Maccullochella macquariensis"

1

Chotipuntu, Piyapong, and n/a. "Salinity sensitivity in early life stages of an Australian freshwater fish, Murray cod (Maccullochella peelii peelii Mitchell 1838)." University of Canberra. Resource, Environmental & Heritage Sciences, 2003. http://erl.canberra.edu.au./public/adt-AUC20060331.115030.

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The Murray cod (Maccullochella peelii peelii Mitchell 1838) is Australia�s largest freshwater fish. Once highly abundant in the Murray-Darling river system, populations have drastically declined in recent decades. Many causes for this decline have been proposed, including over-fishing, habitat loss and altered river flow regimes. This study hypothesised that elevated salinities have led to selective mortality in some developmental stages, which have in turn depleted stock recruitment and adult populations. The objectives of this study were to determine the optimal, threshold, upper sublethal and lethal salinities for development of eggs, yolk-sac larvae, fry and fingerlings of M. peelii peelii. Investigation the impact of salinity on fertilisation utilised gametes of trout cod (M. macquariensis, Cuvier 1829) instead of M. peelii peelii. Studies were carried out in a controlled laboratory environment using test media prepared from commercial sea salt. The results showed that the eggs of the trout cod hatched only when fertilised and incubated in freshwater, and only larvae hatched in freshwater survived through the yolk absorption period of 12 days. Yolk utilisation efficiencies were not significantly different among the salinities of 0-0.30 g/L. There was no effect of pre- or post- fertilising processes on the salinity tolerances of yolk-sac larvae. No larvae survived at salinities higher than 0.30 g/L during the yolk utilisation period. Lethal salinity concentration in Trout cod and Murray cod larvae was exposure time dependent. The 1 day LC50 of the larvae was 1.97 and 2.33 g/L respectively, compared with the 12 day LC50 values of 0.50 and 0.35 g/L respectively. The threshold (no effect level) salinities of larvae of Trout cod and Murray cod were 0.46 and 0.34 g/L respectively at 12 days exposure. The salinity sensitivities of fry of Murray cod were moderated by increasing pH between pH 6.2 and 8.8, and stimulated by increasing temperatures from 15 to 30°C. The optimal salinity was only slightly affected by temperature. The threshold and upper sublethal salinities varied slightly depending on feeding regime. The salinity sensitivities of fingerlings of Murray cod were: LC50 = 13.7 g/L; optimal salinity from 4.6 to 5.0 g/L ; threshold salinity from 5.9 to 7.4 g/L, and upper sub-lethal salinity from 9.2 to 9.9 g/L � with the range in all cases affected by acclimation period salinity. The blood osmolality at LC50 of the fingerlings was 444 mOsmol/kgH2O or equivalent to 14.2 g/L, and the dehydration rate was 4.8%. The osmolality increased significantly in salinities higher than 9.0 and 6.0 g/L when fish were exposed for a period of 1 day and 41 days respectively. The oxygen consumption increased significantly in salinities higher than 8.0 g/L. Distortion of the notochord and corrosive skin syndrome were major symptoms describing sub-lethal effects found in the embryos, and fry and fingerlings of Murray cod respectively. Noting the risks of extrapolating directly from laboratory to field conditions, it is predicted that when salinity in natural habitats increases above 0.34 g/L a significant impact on Murray cod recruitment will result.
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