Incidencia de la contaminación urbana en la salud y diversidad de los peces del rio

En este trabajo se analizaron las causas que han provocado la perdida de diversidad de peces en un tramo del Rio Caluma, el cual ha sido utilizado por la población como vertedero de desechos y aguas servidas, el trabajo tuvo 3 fases: campo, laboratorio y análisis de datos, en los seis muestreos realizados se tomaron muestras de agua para realizar análisis de amonio, nitritos y pH, además se capturaron peces para su identificación, se seleccionaron peces vivos al azar para realizar patología en fresco. Se encontraron en el agua niveles promedios de amonio 0.55 ppm y nitrito 0.20 ppm, pH ligeramente alcalino 7.9, lo que aumenta la toxicidad de estos compuestos nitrogenados, en los análisis patológicos en fresco se encontraron enfermedades como parasitosis, aletas raídas por bacterias, presencia excesiva de macrofagos en bazo, higado y riñón, asociadas a contaminantes urbanos. En el tramo no contaminado los valores de nitrito y amonio fueron de 0.001 ppm, valores que no causan toxicidad a los organismos acuáticos, el pH tuvo como promedio 7.2, se identificaron un total de 17 especies de peces distribuidas en 3 órdenes y 9 familias.In this work there were analyzed the reasons that have provoked the loss of diversity of fish in a section of the Rio Caluma, which has been used by the population as dump of waste and served waters, the work had 3 phases: Field, laboratory and analysis of information, in six realized samplings water samples took to realize analysis of ammonium, nitrites and pH, in addition fish were captured for his identification, alive fish were selected at random to realize pathology in fresh air. 0.55 were in the water average levels of ammonium ppm and nitrite 0.20 ppm, pH lightly alkalinly 7.9, which increases the toxicity of these nitrogenous compounds, in the pathological analyses in fresh air they found diseases as parasitosis, fins scraped by bacteria, excessive presence of macrophages in spleen, liver and kidney, associated with urban pollutants. In the not contaminated section the values of nitrite and ammonium were of 0.001 ppm, values that do not cause toxicity to the aquatic organisms, the pH took 7.2 as an average, there wereidentified a total of 17 species of fish distributed in 3 orders and 9 familiesFacultad de Ciencias Naturales, Universidad de Guayaqui

ESTRATEGIAS METODOLÓGICAS BASADAS EN EL USO DE LAS REDES SOCIALES.

LAS ESTRATEGIAS METODOLÓGICAS BASADAS EN EL USO DE LAS REDES SOCIALES SON UNA GRAN VENTAJA PARA QUE LOS ESTUDIANTES DEL NIVEL BACHILLERATO PUEDAN DESARROLLAR SUS COMPETENCIAS ACADÉMICAS; SIN EMBARGO, EL USO EXCESIVO E INADECUADO QUE DAN A ESTAS, MUCHAS VECES REPERCUTEN DIRECTAMENTE EN EL DESEMPEÑO Y RENDIMIENTO ACADÉMICO DE LOS ESTUDIANTES...EL PRESENTE PROYECTO DE INVESTIGACIÓN TIENE COMO OBJETIVO: ELABORAR ESTRATEGIAS METODOLÓGICAS BASADAS EN EL USO DE LAS REDES SOCIALES PARA EL DESARROLLO DE LAS COMPETENCIAS ACADÉMICAS DE LOS ESTUDIANTES DE BACHILLERATO. EN LO ESPECÍFICO: ANALIZAR EL ESTADO DEL ARTE DEL USO DE LAS REDES SOCIALES Y EL DESARROLLO DE LAS COMPETENCIAS ACADÉMICAS..

Jellyfish fisheries in the Americas: origin, state of the art, and perspectives on new fishing grounds

Jellyfish (primarily scyphomedusae) fisheries have a long history in Asia, where jellyfish have been caught and processed as food for centuries. More recently, jellyfish fisheries have expanded to the Western Hemisphere, often driven by demand from Asian buyers and collapses of more traditional local fish stocks. Jellyfish fisheries have been attempted in numerous countries in North, Central, and South America, with varying degrees of success. Here, we chronicle the arrival of jellyfish fisheries in the Americas and summarize relevant information on jellyfish fishing, processing, and management. Processing technology for edible jellyfish has not advanced, and presents major concerns for environmental and human health. The development of alternative processing technologies would help to eliminate these concerns and may open up new opportunities for markets and species. We also examine the biodiversity of jellyfish species that are targeted for fisheries in the Americas. Establishment of new jellyfish fisheries appears possible, but requires a specific combination of factors including high abundances of particular species, processing knowledge dictated by the target market, and either inexpensive labor or industrialized processing facilities. More often than not, these factors are not altogether evaluated prior to attempting a new jellyfish fishery. As such, jellyfish fisheries are currently expanding much more rapidly than research on the subject, thereby putting ecosystems and stakeholders’ livelihoods at risk.Fil: Brotz, Lucas. University of British Columbia; CanadáFil: Schiariti, Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: López Martínez, Juana. Centro de Investigaciones Biológicas del Noroeste; MéxicoFil: Álvarez Tello, Javier. Centro de Investigaciones Biológicas del Noroeste; MéxicoFil: Peggy Hsieh, Y.-H.. Florida State University; Estados UnidosFil: Jones, Robert P.. Southeastern Fisheries Association; Estados UnidosFil: Quiñones, Javier. Instituto del Mar del Perú; PerúFil: Dong, Zhijun. Chinese Academy of Sciences; República de ChinaFil: Morandini, André C.. Universidade de Sao Paulo; BrasilFil: Preciado, Mercy. Instituto Nacional de Pesca; EcuadorFil: Laaz, Enrique. Instituto Nacional de Pesca; EcuadorFil: Mianzan, Hermes Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentin

Jellyfish fisheries in the Americas: origin, state of the art, and perspectives on new fishing grounds

Jellyfish (primarily scyphomedusae) fisheries have a long history in Asia, where jellyfish have been caught and processed as food for centuries. More recently, jellyfish fisheries have expanded to the Western Hemisphere, often driven by demand from Asian buyers and collapses of more traditional local fish stocks. Jellyfish fisheries have been attempted in numerous countries in North, Central, and South America, with varying degrees of success. Here, we chronicle the arrival of jellyfish fisheries in the Americas and summarize relevant information on jellyfish fishing, processing, and management. Processing technology for edible jellyfish has not advanced, and presents major concerns for environmental and human health. The development of alternative processing technologies would help to eliminate these concerns and may open up new opportunities for markets and species. We also examine the biodiversity of jellyfish species that are targeted for fisheries in the Americas. Establishment of new jellyfish fisheries appears possible, but requires a specific combination of factors including high abundances of particular species, processing knowledge dictated by the target market, and either inexpensive labor or industrialized processing facilities. More often than not, these factors are not altogether evaluated prior to attempting a new jellyfish fishery. As such, jellyfish fisheries are currently expanding much more rapidly than research on the subject, thereby putting ecosystems and stakeholders' livelihoods at risk