RT Dissertation/Thesis
T1 Avaliação do comportamento de espécies piscícolas Ibéricas de água doce perante estímulos acústicos e luminosos e o seu contributo para o desenvolvimento de uma barreira comportamental para peixes
T2 Evaluación del comportamiento de especies piscícolas Ibéricas de agua dulce, ante estímulos acústicos y luminosos, y su contribución al desarrollo de una barrera comportamental para peces
A1 Jesus, Joaquim José Barreira de
K1 3105.04 Protección de los Peces
K1 3305.15 Ingeniería Hidráulica
K1 3105 Peces y Fauna Silvestre
AB Freshwater ecosystems of Iberia (Portugal and Spain) suffered, in recent years, substantial modifications promoted by several new large dams, built mainly for hydropower purposes, but also for irrigation, water supply and flood prevention. This factor enhances the risk and vulnerability of native freshwater fishes, in particular migratory species, which are among the most threatened species in Portugal.Despite the increasing vulnerability of the Iberian fish species, scientific studies of a behavioral nature with these fish species are unknown, allowing the development of a system that works effectively as a behavioral barrier for fish.It is known the repulsive effect that some induced primary stimuli, such as sound or light, provoke in fish. The development of Behavioral Barriers for Fish intends to use these effects to promote selective behavioral responses, in the sense of their protection, especially the species potamódromas, either reducing, by dissuasive effect, their mortality in the hydraulic structures of the dams, or as increasing the effectiveness of the passages for fish.The innovative researches developed within the present thesis aim to establish a relationship between the sensorial sensitivities of the three Iberian target species and the frequencies tested, either by acoustic stimuli or by luminous stimuli. In laboratory conditions, the effects of two stroboscopic light frequencies were tested: 350 flashes / minute and 600 flashes / minute and two acoustic frequencies: 140Hz and Sweep-up: <2000Hz in the species: Salmo trutta, Pseudochondrostoma duriense and Luciobarbus bocagei. In a complementary way it’s evaluated the simultaneous effect of the various stimulis.The behavioral assessment of the target species referred above will be complemented with work in the field of Ecology of fish populations, including the behavioral analysis of fish breeding migratory flows (habitat preferences and spawning grounds), in heavily modified environments by the construction of transverse structures in water courses (eg dams)
YR 2021
FD 2021-10-28
LK http://hdl.handle.net/11093/2621
UL http://hdl.handle.net/11093/2621
LA por
DS Investigo
RD 10-dic-2023