Levantamento da velocidade prolongada de peixes: um estudo de caso com o Mandi (Pimelodus maculatus)

• Ano de defesa: 2005
• Autor(a) principal: Giuseppe Campos Vicentini
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Pimelodus maculatus; Velocidade prolongada; Engenharia hidraulica; Pimelodus maculatus Velocidade; Peixe Velocidade Nova York Periódicos; Recursos hídricos Desenvolvimento; Engenharia sanitária; Engenharia ambiental
• Link de acesso: http://hdl.handle.net/1843/REPA-6HPNTW

This Work shows an experimental investigation upon the swimming velocities for neotropical fish, with emphasis to the brazilian catfish mandi (Pimelodus maculatus, Lacepède, 1803). With this fish were made two kinds of tests. The tests made with fixed velocities and the critical velocity tests will allow a powerful increase in the knowledge about our fishswimming capacity, and therefore will be possible the continuous improvement of fish passes constructive parameters, now and in the future. In order to study the swimming capability an experiment apparatus was developed in Centro de Pesquisas Hidráulicas da UFMG. It is a water tunnel where fish is forced to swim against current water that is generated by a pump. For visualization, a fish is confined by screens in atest section, which is made of acrylic. Improvments were made in this apparatus in order to allow a better thermic and hydraulic control of the operation. Then, in order to obtain a graphic diagram which can be compared with that of the cold weather fish, were made tests for determination of the prolonged and critical velocities of the Pimelodus maculatus. The prolonged swimming speeds are measured by taking the time of swimming for a fixed velocity. Before the test is necessary to make an adaptation session in which the fish is forced to swim in a flow with increasing velocity. If the time of swimming in fixed velocity takesover 200 minutes, this velocity is considered sustained and we stop the process. Critical swimming speed, maintained for t minutes, is determined increasing the flow of water with a change of the pump rotation every t minutes until the fish is fatigued. During this test, allfish developed the burst speed, which was determined by filming. The first fish chosen to be tested was Pimelodus maculatus, one of the most common fish in Brazilian rivers. During the tests the fish behavior and characteristics, such as weight and length, were observed and the water characteristics (temperature, dissolute oxygen, pH) were also determined. The results allowed the analysis of the relation between the measured variables by multiple regressions. Then, this relation was compared with the results found in researched biographies. Finally, to validate the methodology, the measured uncertainties and the velocityprofile were verified.