Jorge Ruiz-Legazpi

• PhD
• Researcher at University of Valladolid

Water temperature and flow velocity directly affect the fish swimming capacity, and thus, both variables influence the fish passage through river barriers. Nonetheless, their effects are usually disregarded in fishway engineering and management. This study aims to evaluate the volitional swimming capacity of the northern straight‐mouth nase (Pseudo...

This study aims to describe pre-reproductive movements of Luciobarbus bocagei and Pseudochondrostoma duriense in a regulated canyon-stretch of the Tormes River (Spain), with high environmental variability, semipermeable barriers, and fishway retrofitting actions. The main objectives were to identify peak migration dates and environmental drivers, t...

Knowing the relationship between size, morphological traits and swimming performance of fish is essential to understand the swimming capacity to successfully surpass these obstacles and the selective pressure that barriers in rivers and streams could exert on fish. Northern straight-mouth nase, an endemic potamodromous cyprinid fish species from th...

Fishways are used worldwide to restore fish migration routes. However, there are few standardized metrics that allow the comparison of their performance in a consistence manner. This paper aims to assess fishway internal passage using two standardized metrics: passage success and transit time. Data from selected 20 field stepped fishways evaluation...

Knowing the relationship between morphological traits and swimming capacity of fish is essential to understand on the one hand, the selective pressure that barriers in rivers and streams can exert on these organisms and, on the other, the swimming capacity of the individuals of this species to successfully surpass these obstacles. Northern straigh...

La gestión de los recursos hídricos precisa de datos fiables del caudal circulante por los ríos. Las estaciones de aforo V-flat proporcionan información de calidad, especialmente para flujos bajos, de ahí su proliferación en España durante este siglo. Sin embargo, en función de sus dimensiones, del salto de agua que provoca y del caudal circulante,...

El grado de alteración antropogénica en los ecosistemas fluviales es elevado, debido, fundamentalmente, a la creación de barreras transversales (presas, azudes, estaciones de aforo, caños de drenaje, etc.), que alteran su conectividad longitudinal, causando, entre otros impactos, la fragmentación del hábitat. Esta problemática afecta a los peces mi...

La construcción de obras transversales en los cursos de agua causa, entre otros aspectos, un gran impacto en la continuidad longitudinal de los ecosistemas fluviales. Para paliarlo y permitir el libre desplazamiento de la fauna (especialmente peces) es frecuente la construcción de pasos piscícolas. Sin embargo, a pesar de haberse construido en gran...

When engineers and ecologists face a fishway design, many issues need to be considered, the type of fishway being the first and foremost. It is an especially complex issue in areas with species whose migratory and swimming behavior are as yet poorly known as Mediterranean barbels. The present study focuses on the fish passage of two of the most com...

El presente trabajo analiza la capacidad voluntaria de nado del barbo ibérico (Luciobarbus bocagei Steindachner, 1864) en un canal abierto durante su época de migración, relacionándola con factores ambientales y biométricos. La temperatura del agua, la velocidad de flujo y la longitud del pez fueron los factores de mayor importancia que condicionar...

Many fish passes have been built across the world in recent years. This study analyses the performance of a modified type of pool and weir fishway with two access branches, using passive integrated transponder telemetry. A circum-Mediterranean barbel, Luciobarbus bocagei (Steindachner, 1864), was chosen as the target species. Both hydraulic values...

Los lagos y lagunas de alta montaña no son un rasgo típico del paisaje de la Península Ibérica, sino más bien una excepción en el medio natural, por ello su estudio y conservación presenta gran interés. Este trabajo surge con objeto de inventariar y caracterizar un conjunto de diecisiete complejos lagunares ubicados en las provincias de Palencia y...

Performance; evaluation; fishway; fish ladder; river continuity

Sprinting behavior of free-ranging fish has long been thought to exceed that of captive fish. Here we present data from wild-caught brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta), volitionally entering and sprinting against high-velocity flows in an open-channel flume. Performance of the two species was nearly identical, with th...

En aplicación de la Directiva Marco del Agua, el estudio pretende establecer una serie de indicadores hidromorfológicos que permitan definir el estado de referencia de los humedales como hábitat, así como determinar los procesos de degradación que hayan podido sufrir en una sucesión temporal definida. Partiendo de una serie de fuentes cartográficas...