Dear colleagues, On behalf of the animal pathology laboratory of the Institute of Animal Health and Food Safety of the Univeristy of Las Palmas de Gran Canaria, we are please to announce the publication of the article “Fat embolism and sperm whale ship strikes”, in which the presence of lung fat emboli was proven a reliable diagnostic tool of ante-mortem ship-strikes. Unfortunately, the number of ship strikes in the Canaries have increased in the last months, coincidentally with an increase in the number of fast ferry routes. It is paramount to have an accurate diagnosis of these cases, so further action can be taken by the corresponding authorities. The article is freely available from: <https://doi.org/10.3389/fmars.2019.00379> https://www.frontiersin.org/articles/10.3389/fmars.2019.00379/full Abstract: Strikes between vessels and cetaceans have significantly increased worldwide in the last decades. The Canary Islands archipelago is a geographical area with an important overlap of high cetacean diversity and maritime traffic, including high-speed ferries. Sperm whales (Physeter macrocephalus), currently listed as a vulnerable species, are severely impacted by ship strikes. Nearly 60% of sperm whales’ deaths are due to ship strikes in the Canary Islands. In such cases, subcutaneous, muscular and visceral extensive hemorrhages and hematomas, indicate unequivocal antemortem trauma. However, when carcasses are highly autolysed, it is challenging to distinguish whether the trauma occurred ante- or postmortem. The presence of fat emboli within the lung microvasculature is used to determine a severe “in vivo” trauma in other species. We hypothesized fat emboli detection could be a feasible, reliable and accurate forensic tool to determine ante-mortem ship strikes in stranded sperm whales, even in decomposed carcasses. In this study, we evaluated the presence of fat emboli by using an osmium tetroxide (OsO4) based histochemical technique in lung tissue of 24 sperm whales, 16 of them with evidence of ship strike, stranded and necropsied in the Canaries between 2000 and 2017. About 70% of them presented an advanced autolysis. Histological examination revealed the presence of OsO4-positive fat emboli in 13 out of the 16 sperm whales with signs of ship strike, and two out of eight of the ‘control’ group, with varying degrees of abundance and distribution. A classification and regression tree was developed to assess the cut off of fat emboli area determining the high or low probability for diagnosing ship-strikes, with a sensitivity of 89% and a specifity of 100%. The results demonstrated: 1) the usefulness of fat detection as a diagnostic tool for “in vivo” trauma, even in decomposed tissues kept in formaldehyde for long periods of time; and 2) that, during this 18-year period, at least, 81% of the sperm whales with signs of ship strike were alive at the moment of the strike and died subsequently. This information is highly valuable in order to implement proper mitigation measures in this area. Best regards, Marina Arregui Antonio Fernández Marina Arregui Gil PhD Student Centro Atlántico de Investigación de Cetáceos, Instituto Universitario de Sanidad Animal y Seguridad Alimentaria, Facultad de Veterinaria. Universidad de Las Palmas de Gran Canaria. Campus Universitario Cardones de Arucas, 35413 Arucas, Gran Canaria España Email: marina.arregui@ulpgc.es Antes de imprimir este correo electrónico, piense bien si es necesario hacerlo: el medio ambiente es una cuestión de todos. Please consider the environment before printing this email.