Effects of dietary astaxanthin concentration and feeding period on the skin pigmentation of Australian snapper Pagrus auratus (Bloch & Schneider, 1801)

A single-factor experiment was conducted to investigate the effects of dietary astaxanthin concentration on the skin colour of snapper. Snapper (mean weight=129 g) were held in white cages and fed one of seven dietary levels of unesterified astaxanthin (0, 13, 26, 39, 52, 65 or 78 mg astaxanthin kg⁻¹) for 63 days. Treatments comprised four replicate cages, each containing five fish. The skin colour of all fish was quantified using the CIE L^*, a^*, b^* colour scale after 21, 42 and 63 days. In addition, total carotenoid concentrations of the skin of two fish cage−1 were determined after 63 days. Supplementing diets with astaxanthin strongly affected redness (a^*) and yellowness (b^*) values of the skin at all sampling times. After 21 days, the a^* values increased linearly as the dietary astaxanthin concentration was increased before a plateau was attained between 39 and 78 mg kg⁻¹. The b^* values similarly increased above basal levels in all astaxanthin diets. By 42 days, a^* and b^* values increased in magnitude while a plateau remained between 39 and 78 mg kg⁻¹. After 63 days, there were no further increases in measured colour values, suggesting that maximum pigmentation was imparted in the skin of snapper fed diets >39 mg kg⁻¹ after 42 days. Similarly, there were no differences in total carotenoid concentrations of the skin of snapper fed diets >39 mg kg⁻¹ after 63 days. The plateaus that occurred in a^* and b^* values, while still increasing in magnitude between 21 and 42 days, indicate that the rate of astaxanthin deposition in snapper is limited and astaxanthin in diets containing >39 mg astaxanthin kg⁻¹ is not efficiently utilized. Astaxanthin retention after 63 days was greatest from the 13 mg kg⁻¹ diet; however, skin pigmentation was not adequate. An astaxanthin concentration of 39 mg kg⁻¹ provided the second greatest retention in the skin while obtaining maximum pigmentation. To efficiently maximize skin pigmentation, snapper growers should commence feeding diets containing a minimum of 39 mg unesterified astaxanthin kg⁻¹ at least 42 days before sale.

Changes in skin colour and cortisol response of Australian snapper Pagrus auratus (Bloch & Schneider, 1801) to different background colours

A two-factor experiment was carried out to investigate the change in skin colour and plasma cortisol response of cultured Australian snapper Pagrus auratus to a change in background colour. Snapper (mean weight=437 g) were held in black or white tanks and fed diets containing 39 mg unesterified astaxanthin kg⁻¹ for 49 days before being transferred from white tanks to black cages (WB) or black tanks to white cages (BW). Skin colour values [L^* (lightness), a^* (redness) and b^* (yellowness)] of all snapper were measured at stocking (t=0 days) and from cages of fish randomly assigned to each sampling time at 0.25, 0.5, 1, 2, 3, 5 and 7 days. Plasma cortisol was measured in anaesthetized snapper following colour measurements at 0, 1 and 7 days. Fish from additional black-to-black (BB) and white-to-white (WW) control treatments were also sampled for colour and cortisol at those times. Rapid changes occurred in skin lightness (L^* values) after altering background colour with maximum change in L^* values for BW and WB treatments occurring within 1 day. Skin redness (a*) of BW snapper continued to steadily decrease over the 7 days (a*=7.93 × e^{−0.051 × time}). Plasma cortisol concentrations were highest at stocking when fish were held at greater densities and were not affected by cage colour. The results of this study suggest that transferring dark coloured snapper to white cages for 1 day is sufficient to affect the greatest benefit in terms of producing light coloured fish while minimizing the reduction in favourable red skin colouration.

Stimulating vertical integration in coastal management in a federated nation: The case of Australian coastal policy reform.

Four decades ago Australia was credited as being an early leader in  implementing integrated coastal management (ICM). Nevertheless, as a  federation of states and territories Australia has since struggled to fully  implement vertical integration of its coastal governance arrangements. In particular the federal government has historically possessed only a minor role in coastal management despite the recommendations of several major inquires suggesting that this role needed to be enhanced. This article examines a series of circumstances and events over the past two years in Australia that has created the opportunity for the federal government to adopt a more significant and prominent role in coastal management and hence to substantially complete the vertical integration of ICM in Australia. These stimuli for coastal policy reform could also play a role in enhancing ICM in other federated nations.

Where and when does a ring start and end? Testing the ring-species hypothesis in a species complex of Australian parrots

Speciation, despite ongoing gene flow can be studied directly in nature in ring species that comprise two reproductively isolated populations connected by a chain or ring of intergrading populations. We applied three tiers of spatio-temporal analysis (phylogeny/historical biogeography, phylogeography and landscape/population genetics) to the data from mitochondrial and nuclear genomes of eastern Australian parrots of the Crimson Rosella Platycercus elegans complex to understand the history and present genetic structure of the ring they have long been considered to form. A ring speciation hypothesis does not explain the patterns we have observed in our data (e.g. multiple genetic discontinuities, discordance in genotypic and phenotypic assignments where terminal differentiates meet). However, we cannot reject that a continuous circular distribution has been involved in the group's history or indeed that one was formed through secondary contact at the 'ring's' east and west; however, we reject a simple ring-species hypothesis as traditionally applied, with secondary contact only at its east. We discuss alternative models involving historical allopatry of populations. We suggest that population expansion shown by population genetics parameters in one of these isolates was accompanied by geographical range expansion, secondary contact and hybridization on the eastern and western sides of the ring. Pleistocene landscape and sea-level and habitat changes then established the birds' current distributions and range disjunctions. Populations now show idiosyncratic patterns of selection and drift. We suggest that selection and drift now drive evolution in different populations within what has been considered the ring.

Science education in early childhood : a snapshot of Australian settings

In Australia, reform is occurring in the area of early childhood. It is in this time of reform, that a research project was instigated which studied the amount of science being undertaken in early childhood settings as well as how it was implemented. This highlighted some interesting differences across settings. This presentation will describe case studies of four pre-school settings and some of the activities undertaken by the children - both as part of the formal program and through incidental play. It will consider these through a socio-cultural framework, noting how teachers used their understandings of play and play theory, to enhance children’s understandings.

Double disability : lived experience of Australian tertiary students with ME/CFS

This research is the exploration of the lived experience of tertiary students in Australia with the medical condition usually known as ME/CFS (Myalgic Encephalomyelitis /Chronic Fatigue Syndrome) seeking to explore issues of equity and human rights from the perspective of the Disability Discrimination Act 1992. Students feel that their difficulties are not caused just by the illness itself but by the failure of the tertiary institutions to understand the effects of this illness on them, the student, especially within the areas of accommodations and assessments. Their lived experiences are studied to ascertain if their experiences differ from those of other tertiary students. Forty participants came from every state and territory of Australia and twenty -four of Australia's universities as well as eight Technical and Further Education/Open Training Education Network (TAFE/OTEN) colleges are represented. The selection of the chosen methodology, Critical Ethnography from a Habermasian perspective, has been circumscribed by the medical condition which placed limitations on methodology and also data gathering methods. Non-structured stories, in which the participants wrote of their lived experience as students, were considered the most appropriate source of data. These were transmitted by electronic mail (with some by postal mail) to the researcher. A short questionnaire provided a participant background to the stories and was also collated for a composite overview of the participants. The stories are analysed in a number of ways: six selected stories are retold and the issues arising from these stories have been weighed against the remainder of the stories. Four intertwined themes were constructed from the issues raised in each story. Apparent infringements of the Disability Discrimination Act (1992) which impact on quality of life, human rights and equity are found. No accommodations are being made by the academic institutions for the cognitive dysfunctions and learning difficulties. Students are stigmatised and lack credibility to negotiate appropriate academic accommodations. A possible means of improving the ability of students to negotiate appropriate accommodations is explored. Finally the researcher reflects on her own involvement in the research as an 'insider' researcher.

At the limits : postcolonial and hyperreal translations of Australian poetry

This dissertation employs the methodologies of postcolonial theory and hyperreal theory (following Baudrillard), in order to investigate articulations of identity, nation and representation in contemporary Australian poetry. Informed by a comparative analysis of contemporary Latin American poetry and cultural theory (in translation), as a means of re-examining the Australian context, this dissertation develops a new transnational model of Australian poetics. The central thesis of this dissertation is that contemporary Australian poetry engages with the postcolonial at its limits. That is, at those sites of postcoloniality that are already mapped by theory, but also at those that occur beyond postcolonial theory. The hyperreal is understood as one such limit, traceable within the poetry but silenced in conventional postcolonial theory. As another limit to the postcolonial, this dissertation reads Latin American poetry and theory, in whose texts postcolonial theory is actively resisted, but where postcolonial and hyperreal poetics nevertheless intersect. The original critical context constructed by this dissertation enables a new set of readings of Australian identity through its poetry. Within this new interpretative context, the readings of contemporary Australian poetry articulate a psycho-social postcoloniality; offer a template for future transactions between national poetry and global politics; and develop a model of the postcolonial hyperreal.

Firms as adaptive organizations : the case of Australian trading banks

The conventional accounting notion of ‘going concern’ — that a firm will continue its business operations in the same manner indefinitely — has underpinned accounting practice for over one hundred years. This idea has provided a rationale for spreading costs over accounting periods and for deferring costs as assets in balance sheets. An alternative idea that is widely regarded as reliable in the literatures of economics and deliberate action is that firms continually adapt to changes in market and economic conditions. That is economic behaviour. The implications of that view of a firm for accounting have been systematically explored by Chambers (1966). While not examining those particular implications, many other accounting theorists have been critical of the conventional accounting idea of 'going concern' and of its impact on accounting practice. The two notions of ‘going concern’ - as static or adaptive enterprises - are examined by referring to the business operations of the four major Australian trading banks over the period 1983-1991. Banks were selected because they are commonly thought to be particularly ‘conservative’ organizations. The period 1983—1991 was chosen because it covers the era of deregulation of the Australian financial system. The evidence adduced by this study indicates that the Australian trading banks have continually adapted their organizational structures and business operations in the light of changes in technology, markets for financial services, government policies and domestic and global economic conditions. Illustrations of adaptive behaviour by banks ate drawn from their normal operating procedures such as the provision of products and services, loan services, acquisitions, sale of property, non-core banking operations and international banking. It is argued on analytical grounds that the cost basis of accounting does not yield financial statements that provide factual and up-to-date information about the financial capacity of firms to pay their debts and to continue trading generally; that is, to be going concerns. At any time, those financial capacities are determined by the amount of money commanded by a firm, including the money's worth of its assets, and by its level of debt. It is concluded on empirical grounds that the Australian trading banks, at least, are adaptive entities.

Descriptive epidemiology of Australian football injuries presenting to sports medicine clinics

Sports injury prevention has been the focus of a number of recent public health initiatives due to the acknowledgement that sports injuries are a significant public health problem in Australia Whilst Australian football is one of the most popular participation sports in the country, only very limited data is available about football injuries The majority of sports injury data available for this sport is from hospital emergency departments and elite-level injury surveillance Overall there is a paucity of data from treatment settings other than hospitals In particular, there is a lack of information about the injuries sustained by community-level, junior and recreational Australian football participants. One good potential source of football injury data is sports medicine clinics. Analysis of injury presentations to sports medicine clinics was undertaken to provide a detailed description of the epidemiology of Australian football injuries that present to this treatment setting and to determine the implications for injury prevention in this sport. In addition, the data from sports medicine clinics was compared with existing sources of Australian football injury data to determine how representative sports medicine clinic data is of other football injury data sources and to provide recommendations for future injury surveillance n Australian football. The results contained in this thesis show that Australian football is the sport most associated with injury presentation at sports medicine clinics. The majority of injured Australian football players presenting to sports medicine clinics are community-level or junior participants which suggests that sports medicine clinics are a good source of information on the injuries sustained by sub-elite football participants. Competition is the most common context in which Australian football players presenting to sports medicine clinics are injured. The major causes of injuries to Australian football players are being struck by another player, collisions and overuse. Injuries to Australian football players predominantly involve the lower limb. Adult players, players who stopped participating immediately after noticing their injury and players with overuse injuries are the most likely to sustain a more severe injury (i.e. more than four weeks before a full return to football participation and a moderate/significant amount of treatment expected). The least experienced players (five or less years of participation) are more likely to require a significant amount of treatment than the more experienced players. The prevention of lower limb injuries, injuries caused by body contact and injuries caused by overuse should be a priority for injury prevention research in Australian football due to the predominance of these injury types in the pattern of Australian football injuries Additionally, adult players, as a group, should be a focus of injury prevention activities in Australian football due to the association between age and injury severity. Overall, the pattern of Australian football injuries presenting to sports medicine clinics appears to be different than reported by club-based and hospital emergency department injury surveillance activities. However, detailed comparison of sports medicine clinic Australian football data with other sources of Australian football injury data is difficult due to the variable methods of collecting and reporting injury information used by hospital emergency department and club-based injury surveillance activities. The development of a standardised method for collecting and reporting injury data in Australian football is strongly recommended to overcome the existing limitations of data collection in this sport. In summary, sports medicine clinics provide a rich source of Australian football injury data, especially from the community and junior levels of participation. The inclusion of sports medicine clinic data provides a broader epidemiological picture of Australian football injuries. This broader understanding of the pattern of Australian football injuries provides a better basis for the development of injury prevention measures in this sport.

Evaluation of Australian undergraduate engineering management education for flexible delivery

This thesis examines issues in Australian undergraduate engineering management studies in the context of flexible learning delivery. It is proposed that, within an Australian context: a) the management skills and competencies required by graduate engineers can be determined and classified on a rational basis, permitting an educational focus on those elements most appropriate for graduates; and b) on-line and other computer-based technologies are a practical and effective method for the support of undergraduate engineering management studies. The doctoral project incorporates: • an examination of the nature of engineering management; • a review of the relevant literature establishing the importance of management studies in undergraduate engineering courses; • a review of historical and recent developments in Australian undergraduate engineering management studies; • an investigation of the management skills and competencies required by graduate engineers - based on original research; • an examination of flexible delivery of engineering education - based on professional practice experience; and • an evaluation of case studies of flexible delivery of engineering management education - based on original research and professional practice experience. A framework of ranked classified management skills is developed. Broadly, the ranking framework is generic professional skills, followed by general management skills and technical discipline specific management skills, followed by other professional discipline skills and theoretical skills. This framework provides a rational basis for design of undergraduate engineering management studies. This is supplemented by consideration of the management skills required for the future of engineering practice. It is concluded that undergraduate engineering management education is well suited to delivery and support by on-line and computer-based technology. Recent developments in improved access to the Internet, software systems for on-line collaboration and changes in copyright legislation to create a broad-based right to communication via on-line media have contributed to the facilitation of on-line delivery of teaching and learning. It is noted that though many on-line infrastructure issues have been satisfactorily resolved, higher level issues will emerge as being crucial, including the academic staff development and reward for operating in an online teaching environment and the financial sustainability of on-line development and delivery of courses.

Crisis in Clio's family : a study of the discipline of Australian economic history 1918-1965

This thesis presents an intellectual history of the historiography of Australian Economic History between 1918 and 1965. More specifically, it is a contribution to a relatively novel area of research into 'disciplinary history’. It takes as its basic analytical material the four books widely used for significant lengths of time for undergraduate teaching during the period of the study. The thesis consists of five main chapters, plus an appendix which surveys the institutional development of Australian Economic History and provides the empirical basis for the selection of the works named above. After a brief introduction and overview, the next four chapters consist of a detailed study of one of these works, the historical context in which each was written, and an intellectual biography. The fifth chapter is largely theoretical and conceptual. It analyses the epistemological bases of History and Economics and explores the implications of different models of knowledge for the relationship between Economic History and its two antecedent disciplines, History and Economics. Current perceptions of the state of the discipline in Australia and overseas are also examined. There are three main propositions advanced and their implications explored in the fifth chapter. First, that changes which occurred in Australian Economic History during the period 1918-1965 shifted the discipline from the broad area of History to the broad area of Economics. Second, that the inherent tension and fundamental differences between the two disciplinary areas of History and Economics have profound and complex implications for Australian Economic History at a number of levels and in a number of areas. The third proposition posits that the paradigm shift of the 1950s/1960s in Australian Economic History, and the paradigm shift of the 1960s/1970s in Economic History respectively have resulted in crisis. The final part of the chapter summarises the contents of the preceding chapters, and draws some conclusions based on those detailed studies.

An empirical analysis of Australian and Portuguese consumers within the context of CSR and environmentalism

This cross country study examines the potential environmental predictors of consumers' green behaviour. It uses consumer’s self reported environmental behavioural intentions and examines its potential influence on corporate practice of social responsibility (CSR). A conceptual model was developed and was subjected to empirical verification using survey research design. It was hypothesised that CSR improves green behavioural purchase intension. PLS was used to estimate the measure of respondents’ overall perception of green products and their intention to purchase. It was found that in both countries, Australia and Portugal, CSR influenced purchase intentions. In both cases there was evidence of association between CSR and the consumers’ intention to purchase environmentally safe products.

The moral reasoning abilities of Australian and Malaysian accounting students : a comparative analysis

If national culture is a significant determinant of ethical attitudes, it is not unreasonable to expect ethical decision-making to be influenced by one's culture. However, problems arise when the notion of right differs from one culture to another. The question addressed in this paper is whether the moral reasoning abilities of Australian and Malaysian accounting students in their final year of study differ because of their cultural upbringing. This study uses primary data collected from 34 final year accounting students (12 Australian and 22 Malaysian) enrolled in an Australian degree program. The test scores collected at the beginning and end of the academic year indicate that culture and other explanatory variables do not have an affect on students' moral judgment. The findings in this study suggest that culture as an independent variable does not influence the way accounting students analyse and resolve ethical dilemmas.