The glochidium larvae of freshwater mussels of the family Unionidae need to find suitable hosts to attach themselves and metamorphose into free-living juveniles. The specificity of the host-parasite relationship was investigated for the Iberian Unio tumidiformis Castro, 1885 by means of experimental infections and also by analyzing naturally infected fish. The process of encapsulation of glochi...

Population structure can significantly affect genetic-based demographic inferences, generating spurious bottleneck-like signals. Previous studies have typically assumed island or stepping-stone models, which are characterized by symmetric gene flow. However, many organisms are characterized by asymmetric gene flow. Here, we combined simulated and empirical data to test whether asymmetric gene f...

Hydrologic alteration is a major threat to freshwater biota, and particularly fish, in many river courses around the world. We analyzed and compared the effects of water abstraction on two threatened cyprinid fishes of contrasting ecology (the Mediterranean barbel Barbus meridionalis and the Catalan chub Squalius laietanus) in a Mediterranean stream. We compared abundance, size-structure, growt...

The FishProtector, an Electric Flexible Fish Fence is investigated in ethohydraulic experiments. protection potential tested using outdoor, experimental channel. To find optimum parameter settings, cable clearance, approach flow angle, and the size of electric field vary within predefined limits. Due to combination both, physical barrier (tensioned steel cables) behavioral (pulsed low voltage r...

Bar racks are commonly installed to divert fish away from water intakes, such as those at hydropower stations or other abstraction points. In temperate regions their effectiveness has predominantly been assessed in relation diadromous species, salmon and eel. This study compared the efficacy of horizontally vertically oriented (5 mm diameter 10 spacing) guide downstream moving groups five chub ...

In the context of River Rhône restoration programme, objective this study was to assess dispersal and population connectivity European chub, Squalius cephalus (Linnaeus, 1758) in a section natural, free-flowing part lower Rhône. The elemental water signatures for Sr:Ca Ba:Ca were measured at seven stations within river section, including its tributaries backwaters, determine whether they could ...