Many fish that are exposed to a threat release disturbance cues, which are chemicals that alert conspecifics to the presence of the threat. The release of disturbance cues has been well demonstrated in various species of laboratory-reared fish. Migratory fish species often exhibit increased cortisol levels and are exposed to numerous stressors during their migrations, which could trigger the re...

Atlantic salmon populations are reported to be declining throughout its range, raising major management concerns. Variation in adult fish abundance may be due to variation in survival, growth, and timing of life history decisions. Given the complex life history, utilizing highly divergent habitats, the reasons for declines may be multiple and difficult to disentangle. Using recreational angling...

Harvesting wild populations may contrast or reinforce natural agents of selection and potentially cause evolutionary changes in life-history traits such as growth and maturation. Harvest selection may also act on behavioral traits, although this field of research has so far received less attention. We used acoustic tags and a network of receivers to monitor the behavior and fate of individual A...

Rivinoja, P. 2005. Migration Problems of Atlantic Salmon (Salmo salar L.) in Flow Regulated Rivers. Doctor’s dissertation. ISSS: 1652-6880. ISBN: 91-576-6913-9. Migration patterns of adult Atlantic salmon (Salmo salar) and smolts of salmon and brown trout (Salmo trutta) were studied in the flow controlled areas of two northern Swedish rivers. Fish behaviour and migration success at passages of ...

Changes in the levels of pituitary mRNAs encoding GH, prolactin (PRL) and somatolactin (SL) were determined in pre-spawning chum salmon (Oncorhynchus keta) caught at a few key points along their homing pathway in 1994 and 1995. Furthermore, we analyzed relationships between expression of pituitary-specific POU homeodomain transcription factor (Pit-1/GHF-1) and GH/PRL/SL family genes. In 1994, s...

Close examination of the methods, assumptions, and results of Rechisky et al. (1) indicate that their results are confounded by nonrepresentative tagging, rearing, and release factors, and that critical assumptions are inconsistent with available data. Thus, the authors’ conclusions regarding hydrosystem-related delayed mortality are overreaching and unsupportable. Nonrepresentative fish with a...

UNLABELLED THE AIM of the present study was the comparative investigation of action of widely applied anticancer preparations: cisplatin (cis-DDP) and bleomycin (BLM) on total DNA and telomeres damage in human blood cells. METHODS The "Comet-FISH technique" -- single cell gel electrophoresis ("comet assay") in combination with fluorescent in situ hybridization (FISH) was used for this purpose...

Research on the postnatal development of behavior involving olfaction is reviewed. Included are investigations of olfactory responses of human neonates and young children, the development of preferences in various mammals, the ontogeny of the fright reaction in fish and amphibia, and the attraction of maternal odors for small mammals. The effects of early exposure and conditioning to olfactory ...

Ecological divergence may result when populations experience different selection regimes, but there is considerable discussion about the role of migration at the beginning stages of divergence before reproductive isolating mechanisms have evolved. However, detection of past migration is difficult in current populations and tools to differentiate genetic similarities due to migration versus rece...