Ova ageing is the most important factor affecting fish egg quality after ovulation. Long-term storage of fish ova, using cryopreservation and vitrification techniques, has been unsuccessful to date. Instead, short-term in vitro ova storage has been used successfully and optimized in some cultured fish species. In vitro ova storage can drastically improve mass production of larvae and juveniles in the hatcheries by providing the possibility of the synchronous artificial fertilization for different females. To study how long unfertilized eggs of Eurasian perch (Perca fluviatilis L.) can retain their fertilizing ability after stripping, eggs were stored at temperatures of 4°C, 8°C and 12°C for 72 h post-stripping (HPS). The stored eggs of four female perch were separately fertilized at 0 h (i.e. control eggs fertilized before storage) and at 6-hour intervals during the experimental period of 72 h. The embryos reaching the eyed-egg and hatched-larvae stages, eyed-egg mortality and larval malformation rates were recorded as indices of egg quality. The results indicated that the maximum eyed eggs and hatched larvae (86% and 63%, respectively) were observed for eggs fertilized immediately after stripping, whereas the storage of the eggs at 4°C for 48 HPS decreased the eyed-egg and hatched-larvae rates to 46% and 17%, respectively. The use of a higher storage temperature resulted in a more rapid decrease in egg viability: eyed-egg and hatched-larvae rates of 23% and 9%, respectively, were obtained after 48 HPS storage at 8°C and 2% and 1% for eggs stored at 12°C. Eyed-egg mortality and larval malformation rates were not significantly affected by post-stripping ova ageing for at least up to 36 h. Thereafter, both values increased significantly and were measured to be the highest in the most aged ova. The present study demonstrated that stripped Eurasian perch eggs can be stored for at least 12 h at 4°C to 12°C without a significant reduction in their quality.

This paper reflects on the moralization of the sex industry and the implications thereof in a case study of erotic dance in Ontario since the year 2000. It examines how subjects, objects, and practices are discursively formed and moralized in regulatory discussions of stripping and how subjects engage in and resist moralization. This article argues that in spite of the development of a labour discourse, a discourse moralizing stripping as prostitution, which is, in turn, framed as harmful and deviant, continues to inform regulation.

This article showcases a research, dissemination and impact study on the striptease industry that explores why key stakeholders (dancers) are excluded, and ways that inclusion in policy development is achievable. This form of erotic work has undergone increased attention from policy and regulatory officials in recent years with the introduction of a new licensing process as venues are categorised as Sexual Entertainment Venues. The article will demonstrate how community and campaign group voices were heard over that of the dancers themselves, who were not consulted in the process of the legislative change. However, the article shows how small but significant interventions into policy development by direct work with stakeholders (here Licensing Committees and officers) can make steps towards an inclusion of dancer welfare and safety issues. Finally, we propose a set of principles that can ensure dancer and sex worker voices are included in policy consultation and decision making to ensure evidence-based policy making.

Cet article propose une modélisation numérique tridimensionnelle du procédé de décapage par jet d'eau HP. L'exemple traité concerne un dépôt aéronautique : peinture de type polyuréthane déposée sur un métal homogène infini, A2024, de type carlingue d'avion. Le calcul numérique a été effectué en utilisant le code DYNA3D. Les résultats hydrodynamiques montrent l'importance de l'aplatissement du jet sur la cible traitée. Il s'avère qu'un jet d'eau en mouvement par rapport à la cible à décaper génère des contraintes de cisaillement provoquant un enlèvement du revêtement selon un mode d'érosion. En terme de modélisation, ce phénomène a été mis en évidence grâce à un critère seuil qui simule l'enlèvement des mailles lagrangiennes ainsi soumises aux contraintes générées par l'action du jet sur la cible. Cette érosion est accentuée par un autre phénomène qui se traduit par une concentration des contraintes de traction sur la cible selon la ligne médiane de l'empreinte, lieu géométrique du déplacement du centre du jet. Ces contraintes peuvent générer des fissures qui à leur tour peuvent être des sites privilégiés traversés par des micro-jets à vitesses élevées. L'enlèvement du revêtement est ainsi accéléré. Les résultats ont été validés par des essais expérimentaux.

Trois microalgues, Synechocystis (Picocyanobactérie), Chlorella et Micractinium (Chlorophyta) se développant dans le lagunage naturel, ont été mises en culture en milieu axénique et ensemencées dans des microcosmes d'eau usée filtrée, stérilisée ou non. Ceci dans le but d'évaluer les voies d'élimination de NH4, apporté par cette eau usée. L'assimilation algale, la nitrification et le stripping de NH3, se sont révélées les principales voies d'élimination de l'ammonium dans le milieu non stérilisé. Par ailleurs, dans le milieu stérilisé, seuls l'assimilation algale et le stripping sont présents. Les bactéries hétérotrophes aérobies semblent ne pas intervenir dans cette élimination.