Effects of trawling on the diets of common demersal fish by-catch of a tropical prawn trawl fishery.

The ecological effect of prawn trawling on the benthos of the Gulf of Carpentaria, northern Australia, was investigated by examining stomach contents of common demersal fishes incidentally caught as by-catch in the fishery. Fishes were collected from high and low fishing intensity sites in three regions based on vessel monitoring system data. The diets of eight species of benthic fish predators were compared between regions and fishing intensities. A regional effect on diet was evident for seven species. Only one generalist species had no significant difference in diet among the three regions. For the comparisons within each region, five predator species had significantly different diet between high and low fishing intensities in at least one region. Across the three regions, high fishing intensity sites had predators that consumed a greater biomass of crustaceans, molluscs and echinoderms. At low fishing intensity sites, predators had diets comprising a greater biomass of cnidarians and teleosts, and a different assemblage of molluscs, crustaceans and fishes. These changes in diet suggest that there may have been a shift in the structure of the benthic community following intensive fishing. Analysis of predator diets is a useful tool to help identify changes in the benthic community composition after exposure to fishing. This study also provided valuable diet information on a range of abundant generalist benthic predators to improve the ecosystem modelling tools needed to support ecosystem-based fisheries management.

In situ stress testing to identify Australian black tiger prawns (Penaeus monodon) free of gill-associated virus and Mourilyan virus.

OBJECTIVE: To identify whether black tiger prawns (Penaeus monodon) in the Weipa region of the Gulf of Carpentaria, Queensland, are free of gill-associated virus (GAV) and Mourilyan virus (MoV), which are endemic in P. monodon along the east coast of Queensland. PROCEDURE: Preliminary screening suggested that Weipa might be a source of P. monodon that are free of GAV and MoV. To assess this, more than 150 prawns captured near Weipa were maintained locally in tanks for 2 weeks and bled three times as a stressor to promote higher-level infections. The existence of GAV and MoV in lymphoid organ tissue was then determined using real-time quantitative reverse transcription-polymerase chain reaction (qRT-PCR). Some prawns were maintained in tanks for an additional 75 days before being tested. RESULTS: Real-time qRT-PCR did not detect GAV in any of 33 pools of RNA isolated from the 166 prawns tested. MoV was detected in five pools of RNA at extremely low viral RNA copy numbers close to the sensitivity threshold of the test. MoV was also detected at a similar low copy number in one of nine pearl-oyster mantle samples used as negative controls. CONCLUSIONS: GAV infection is either absent or, like MoV, potentially present at a very low prevalence in juvenile P. monodon inhabiting the inshore waters at Weipa. This region can thus be recommended as a good source of P. monodon certifiable as specific pathogen-free for GAV and MoV, which is desirable for domestication and selective breeding programs in Australia.

The stress of metropolitan general practice.

OBJECTIVE: To identify the work-related stressors of Australian metropolitan general practitioners (GPs). DESIGN AND SETTING: A descriptive postal survey of metropolitan GPs from all States and Territories selected at random from the Health Insurance Commission database. PARTICIPANTS: 296 of 464 GPs (64%) surveyed in June 1996; 67% were male; 87% worked full-time (more than 6 sessions per week). MAIN OUTCOME MEASURES: Frequency and severity of work stressors in general practice; overall feelings of stress at work in the past 12 months; effects of the stressors on work satisfaction; contribution of work stress to overall life stress; responses to the 12-item General Health Questionnaire (GHQ) as potential correlates of occupational stress. RESULTS: "Time pressure to see patients" was the most frequently reported stressor. Threat of litigation was perceived as the most severe stressor. Of the top 10 severe stressors, seven were also in the top 10 for stressor frequency. Work was the major stressor in GPs' lives. The GHQ scores did not correlate significantly with major stress outcome measures, but 12.8% of GPs had scores indicative of severe psychiatric disturbance. Fifty per cent of respondents had considered leaving their current workplace and 53% had considered abandoning general practice because of occupational stress. GPs working 6 or more sessions per week were more likely to be moderately or severely stressed than those working part-time (P< 0.02, Fisher's exact test). Those who had considered leaving their current workplace or careers were also more likely to be moderately or severely stressed (P< 0.0001, Fisher's exact test). CONCLUSIONS: The most frequent and relatively severe stressful events in general practice involved time pressures. There are implications for government, which, through remuneration policies, might influence GPs to work at a rate beyond their capacity to cope. Strategies are required to manage or prevent stress in metropolitan GPs.

Consulting skills training and medical students' interviewing efficiency.

In more traditional medical education, medical students took a patient's medical history by asking a series of sequenced, routine questions, covering presenting medical problem(s); medical history; social and personal history; systems review; and physical examination. Following this process, the student then attempted to derive the patient's medical problems. This inductive problem-solving paradigm may not assist students to prepare for their future interviewing needs, given doctors use a hypothetico-deductive, problem-solving approach when interviewing patients and numerous researchers have developed specialized communication skills training programmes designed to enhance students' interviewing skills. Students given specific consulting skills training have tended to show significantly greater interpersonal effectiveness and improved interview behaviours compared with students who experience traditional patient clerking training. These improvements in interviewing tend to persist over the period of students' medical training. The aim of the present study was to determine whether specialized communication skills training helped students elicit greater quantity and quality of information from patients and if so, whether such information assisted students in improving their diagnostic skills. Videotaped history-taking interviews conducted by students trained in communication skills and untrained (control) students were rated for their interview efficiency. A comparison of ratings given by experimentally naive, independent observers revealed that trained students were more efficient, but took no longer than their control group counterparts to elicit fuller, more relevant information. However, the student groups did not differ in the accuracy or scope of their medical diagnoses. It is argued that students' lack of medical knowledge in this early phase of their clinical training militated against their being able to use their interviewing competence to derive more potentially accurate medical diagnoses.

Behavioural assessment of the effectiveness of a communication programme for medical students.

This study evaluated the effectiveness of a communication programme taught to medical students at the University of Melbourne in their preclinical years. The effectiveness of the programme was assessed by comparing videotaped history-taking interviews completed by a cohort of first-year clinical students in 1986, who had not undertaken the communication programme, with a similar cohort of first-year clinical students in 1992 who had undertaken the programme. The students from the 1986 cohort who had not undertaken communication training in their preclinical course completed their videotaped interviews as part of the experimental evaluation of a consulting skills training programme carried out in 1986-87. A comparison of ratings given by two experimentally naive, independent observers revealed that the 1992 student cohort demonstrated some significantly better skills at questioning and facilitating communication with patients. By contrast, the 1986 student cohort showed significantly greater skills at maintaining relevance in their interviews and greater capacity to explore patients' psychosocial concerns. These data suggest that students acquire the most effective interview skills when interacting with patients during their clinical training.

Psychological tests to measure the effects of medical education on students' interpersonal skills.

The consulting skills required of medical students and practitioners have been categorized into a number of specific skills, two of which are: students' ability to empathize with the patient; and ability to decode non-verbal cues given by the patient in the interview. Training programmes to improve students' consulting skills are usually evaluated using analysis of students' actual interview behaviours with patients. Broad psychological and personality tests have also been used to measure changes in students' interviewing skills, but have generally not been successful. The hypothesis is advanced that more specific tests of the skills of interviewing, such as non-verbal sensitivity and empathy, would detect changes in students' ability to display these skills. As part evaluation of a consulting skills training programme, clinical students completed psychological tests of empathy and non-verbal sensitivity. Subsequent comparisons between trained and control student groups revealed no clear pattern in test results. These data suggest that specific psychological tests of empathy and non-verbal sensitivity may be no more effective in detecting changes in students' interpersonal skills than global personality measures.