Migrating silver eels return from the sea to the river of origin after a false start.

The European eel's singular spawning migration from European waters towards the Sargasso Sea remains elusive, including the early phase of migration at sea. During spawning migration, the movement of freshwater resident eels from river to sea has been thought to be irreversible. We report the first recorded incidents of eels returning to the river of origin after spending up to a year in the marine environment.

Disparate movement behavior and feeding ecology in sympatric ecotypes of Atlantic cod.

Coexistence of ecotypes, genetically divergent population units, is a widespread phenomenon, potentially affecting ecosystem functioning and local food web stability. In coastal Skagerrak, Atlantic cod () occur as two such coexisting ecotypes. We applied a combination of acoustic telemetry, genotyping, and stable isotope analysis to 72 individuals to investigate movement ecology and food niche of putative local "Fjord" and putative oceanic "North Sea" ecotypes-thus named based on previous molecular studies.

Non-greeting rituals in clinical placements.

Background: This study aims to generate knowledge about how clinical placements contribute to the creation of sustainable nursing education in Denmark. The article discusses how nursing students feel socially excluded when registered nurses do not recognise them through deviating from culturally appropriate greeting rituals.

Method: A constructivist grounded theory study of (n = 15) individual semi-structured interviews with nursing students in their first and third years of study.

Cortisol predicts migration timing and success in both Atlantic salmon and sea trout kelts.

Kelts - individuals of anadromous fish species which have successfully spawned and may return to sea to repeat the cycle - are perhaps the least studied life stage of iteroparous fish species. To date, our understanding of what makes them successful in their return migration to sea is limited. We investigated the relationship between three physiological parameters (baseline cortisol, baseline glucose and low molecular weight antioxidants) and the timing and success of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) kelt migration.