Description of embryonic development of Atka mackerel (Pleurogrammus monopterygius)

Atka mackerel (Pleurogrammus monopterygius) is hexagrammid fish that inhabits the temperate and subarctic North Pacific Ocean and neighboring seas (Fig. 1). This highly abundant fish is a critically important prey species (Sinclair and Zeppelin, 2002; Zenger, 2004) that supports a directed commercial trawl fishery (Lowe et al., 2006). Atka mackerel is a demersal spawner and males provide parental care to eggs (Zolotov, 1993). During breeding periods, sexually mature males aggregate on the bottom at nesting sites where they establish territories (Lauth et al., in press). Sexually mature females periodically visit male nesting territories from July to October to spawn batches of demersal egg masses (McDermott and Lowe, 1997; McDermott et al., 2007). Individual nests may consist of multiple egg masses deposited by different females, and males defend nesting territories for a protracted period lasting from the time territories are being established until all eggs within the territory are completely hatched (Lauth et al., 2007). Knowledge about the timing of the reproductive cycle and the use of spawning habitat are important for understanding population structure and the dynamics of stock recruitment, which in turn are important factors in the management of Atka mackerel populations

The effects of temperature on hatching and survival of northern rock sole larvae (Lepidopsetta polyxystra)

Northern rock sole (Lepidopsetta polyxystra) is a commercially important flatfish in Alaska and was recently classified as a distinct species from southern rock sole (L. bilineata). Taxonomic and vital rate data for northern rock sole are still not fully described, notably at early egg and larval stages. In this study, we provide new taxonomic descriptions of late-stage eggs and newly hatched larvae, as well as temperature-response models of hatching (timing, duration, success), and larval size-at-hatch and posthatch survival at four temperatures (2°, 5°, 9°, and 12°C). Time-to-first-hatch, hatch cycle duration, and overall hatching success showed a negative relationship with temperature. Early hatching larvae within each temperature treatment were smaller and had larger yolk sacs, but larvae incubated at higher temperatures (9° and 12°C) had the largest yolk reserves overall. Despite having smaller yolks, size-at-hatch and the maximum size achieved during the hatching cycle was highest for larvae reared at cold temperatures (2° and 5°C), indicating that endogenous reserves are more efficiently used for growth at these temperatures. In addition, larvae reared at high temperatures died more rapidly in the absence of food despite having more yolk reserves than cold-incubated larvae. Overall, northern rock sole eggs and larvae display early life history traits consistent with coldwater adaptation for winter spawning in the North Pacific

Italy in the Australian news media, 2005-2012

Presents a systematic analysis of the coverage of Italian matters in the Australian news media in the period 2005-2012. Executive summary The study presents a systematic analysis of the coverage of Italian matters in the Australian news media in the period 2005-2012. As far as the authors are aware it is largest study of the representation of Italy in the news media of a foreign country ever undertaken.   The study was undertaken by the University of Canberra’s News and Media Research Centre (N&MRC) in association with the On. Marco Fedi, who commissioned research on coverage of Italian politics in selected Australian newspapers.   During the period covered by the study there was more than usual interest in Italian political developments in Australia, both because of their inherent newsworthiness and because of the newly-acquired right of direct participation of expatriate Italians in Australia in the 2006 and 2008 Italian general elections.   To obtain as wide a view of Italy in the Australian news as practicable both the press and television were included in the study.   Three well -known and respected newspapers, namely The Australian, the major national newspaper, The Sydney Morning Herald (SMH) published in Sydney and The Age published in Melbourne were selected for the study. All editorial matter in all issues of these newspapers for the years 2005-2012 was searched using ‘Factiva’– a business information and research tool owned by Dow Jones & Company. The initial search for relevant news in the press generated a very large number of items (around 10,000) which were then assessed individually for relevance and eligibility for inclusion in the analysis. This process generated a data set of 5325 news items