Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
1
artículo
Publicado 2011
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This paper describes the methodology used to predict the behavior presented by a displacement boat when it sails in certain sea conditions. It is important that the naval engineer determines this behavior in the design phase of the boat, because this way you can evaluate the adverse performance, such as the rise of the propellant, shipping water on deck, slamming and excessive accelerations vertical. The harmful effects described above are predicted by the response spectra of the vessel for a given sea condition and for a given movement. The procedure used for obtaining Response Spectra consists of overlapping Unitary Operator Response in regular waves for a given vessel movement (RAO) and the energy spectrum of Pierson-Moskowitz, used to represent the sea in a certain condition. The operator of the boat united response was determined using a Dynamic Vessel program based on the Th...
2
artículo
Publicado 2011
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This paper describes the methodology used to predict the behavior presented by a displacement boat when it sails in certain sea conditions. It is important that the naval engineer determines this behavior in the design phase of the boat, because this way you can evaluate the adverse performance, such as the rise of the propellant, shipping water on deck, slamming and excessive accelerations vertical. The harmful effects described above are predicted by the response spectra of the vessel for a given sea condition and for a given movement. The procedure used for obtaining Response Spectra consists of overlapping Unitary Operator Response in regular waves for a given vessel movement (RAO) and the energy spectrum of Pierson-Moskowitz, used to represent the sea in a certain condition. The operator of the boat united response was determined using a Dynamic Vessel program based on the Th...
3
artículo
Publicado 2022
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This study determined the operational capacity of the freezing tunnel of a fishing services company. The operation of the equipment was inspected, the theoretical operational parameters were collected, and in 40 selected points, the speed (1,8 – 4,4 m/s) and temperature (–25 °C and –11 °C) of the air, and the initial and final freezing temperatures of whole gutted mahi-mahi (Coryphaena hippurus) were evaluated. The real operating capacity of the equipment (77,2 kW) was calculated by applying mathematical expressions that allowed to determine the thermal loads, and later it was compared with the design capacity (75 kW). The speed and temperature of the air inside the equipment and the temperature distribution of the product were not uniform. They depended on the location of the fans and the measurement points. These variations affected the thermal loads generated by the product an...
4
artículo
Publicado 2022
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This study determined the operational capacity of the freezing tunnel of a fishing services company. The operation of the equipment was inspected, the theoretical operational parameters were collected, and in 40 selected points, the speed (1,8 – 4,4 m/s) and temperature (–25 °C and –11 °C) of the air, and the initial and final freezing temperatures of whole gutted mahi-mahi (Coryphaena hippurus) were evaluated. The real operating capacity of the equipment (77,2 kW) was calculated by applying mathematical expressions that allowed to determine the thermal loads, and later it was compared with the design capacity (75 kW). The speed and temperature of the air inside the equipment and the temperature distribution of the product were not uniform. They depended on the location of the fans and the measurement points. These variations affected the thermal loads generated by the product an...
5
artículo
We present a case of distal ileum perforation after the ingestion of a fish bone. This case report includes the symptomatology, studies conducted for reaching a concise diagnosis, abdominal ultrasound results, and description of the operative technique. In addition, a discussion of the topic and information gathered from the literature is carried out.
6
artículo
Publicado 2018
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The parasitic copepod Neoergasilus japonicus (Harada, 1930), native to eastern Asia, was collected from Colossoma macropomum (Cuvier, 1818) cultivated in a fish pound in the department of San Martin, Peru in July 2017. The parasite specimens were found attached to the base of the dorsal fin. Neoergasilus japonicus is widespread in different fish species across the world, being in this study recorded for the first time parasitizing a fish in South America. It is probably that exotic fish hosts associated with the fish-culture industry, such us the tilapia, is the responsible for the transportation and introduction into this part of the world.
7
artículo
Publicado 2013
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The objective of the study was to determine the frequency of hepatic lipidosis in rainbow trout (Oncorhynchus mykiss) of juvenile phase based on anatomical and histopathological lesions in the liver. The specimens (n=58) were obtained from a commercial fish farm in the central highlands of Peru. The fish were classified as healthy (n=23) and ill (n=35) according to the darkening of the skin and fin erosion. Liver samples were collected, fixed in 10% formalin, and stained with hematoxylin eosin. Results showed that 70.6% (41/58) of the fish had lesions compatible with hepatic lipidosis, where grade 3 had the largest incidence (27.6%). The highest frequency of hepatic lipidosis in grade 3 and 4 was observed in healthy animals.
8
artículo
Publicado 2018
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The parasitic copepod Neoergasilus japonicus (Harada, 1930), native to eastern Asia, was collected from Colossoma macropomum (Cuvier, 1818) cultivated in a fish pound in the department of San Martin, Peru in July 2017. The parasite specimens were found attached to the base of the dorsal fin. Neoergasilus japonicus is widespread in different fish species across the world, being in this study recorded for the first time parasitizing a fish in South America. It is probably that exotic fish hosts associated with the fish-culture industry, such us the tilapia, is the responsible for the transportation and introduction into this part of the world.
9
artículo
Publicado 2015
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In this paper we formulate and apply the Exergy Analysis the set heat energy consumption elements of a typical plant of fishmeal, estimating experimentally the specific heat of the solid- liquid-vapor mixtures that form the raw material and steam, in order to optimize energy consumption by changes in the original installation and thus achieving the reduction in operating costs. Usually in these plants conventional energy balance and the premise that the specific heats are physical single phase flows is used; however, when solid-fat-water-steam mixture flows are presented, as is the case, these simple energy balances in each heating element become weak and lead to a high error margin in energy system assessment. In the methodology, the specific heats of mixture flows fat-water-vapor-solid is estimated by measurement of indicators in the industrial plant, contrasted with laboratory standar...
10
artículo
Publicado 2017
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Branchiurans are parasites from the buccal cavity, gills, skin, and fins of various fish species. The Neotropical region has one of the highest diversity of branchiurans. On Arapaima gigas, only four species of branchiurans have been reported. The present study improves the knowledge on host and geographical range of Dolops striata. Fish were collected from a fish farm in the State of Pará, Brazil. All A. gigas were parasitized by Dolops striata, which were collected from the fins and body surface. This is the first record of D. striata in A. gigas. The high prevalence detected warns the possibility of an increase in the number of D. striata infesting A. gigas, which may cause some problems for fish-farmers.
11
artículo
Publicado 2016
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The presence of Plesiomonas shigelloides causing enteric disease in tilapia Oreochromis niloticus in a fish farm in Lima region, Peru is reported. The bacteria were isolated and identified as Plesiomonas shigelloides by conventional biochemical techniques and confirmed by the API 20NE system (numerical profile 7162744 that ratifies 99.3% P. shigelloides). Strains evaluated (n=4) had a fermentative metabolism of glucose, test positive to cytochrome oxidase, indole, Voges-Proskauer and methyl red. The most frequent external signs were erythema in abdomen and pectoral fins, and prominent and reddened anus with bloody discharge. Internally, ascites in visceral cavity and gut inflammation were detected. Histopathology studies revealed edema of the lamina propia and epithelial necrosis of gastric and intestinal tissue, and necrosis in anterior kidney and gonad.
12
artículo
Publicado 2017
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Branchiurans are parasites from the buccal cavity, gills, skin, and fins of various fish species. The Neotropical region has one of the highest diversity of branchiurans. On Arapaima gigas, only four species of branchiurans have been reported. The present study improves the knowledge on host and geographical range of Dolops striata. Fish were collected from a fish farm in the State of Pará, Brazil. All A. gigas were parasitized by Dolops striata, which were collected from the fins and body surface. This is the first record of D. striata in A. gigas. The high prevalence detected warns the possibility of an increase in the number of D. striata infesting A. gigas, which may cause some problems for fish-farmers.
13
artículo
Publicado 2016
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En el presente trabajo se reporta la presencia de Plesiomonas shigelloides causando un cuadro patológico entérico en tilapia Oreochromis niloticus en una piscigranja de la región Lima, Perú. Las bacterias fueron aisladas e identificadas por técnicas bioquímicas convencionales y confirmadas por el sistema API 20NE (perfil numérico 7162744 que ratifica a P. shigelloides al 99.3%). Las cepas evaluadas (n=4) presentaron un metabolismo fermentativo de glucosa, positividad en las pruebas de citocromo oxidasa, indol, Voges-Proskauer y rojo de metilo. Los signos externos más frecuentes de la enfermedad fueron eritema en el vientre y las aletas pectorales, ano prominente y enrojecido con descarga sanguinolenta. Internamente se observó el intestino inflamado y la presencia de líquido ascítico en la cavidad visceral. El estudio histopatológico reveló edema de la lámina propia y necros...
14
artículo
The data used in this work was provided by the Ecosac fish farm. The authors wish to express their appreciation for this and for all the support throughout the investigation, especially to the production engineer Grover Cedillo. This research has received financial support from the government of Peru, under contract 49-2018 of the project Proyecto de Mejoramiento y Ampliacion de los Servicios del Sistema Nacional de Ciencia, Tecnologia e Innovacion Tecnologica 8682PE, of the CON-CYTEC/FONDECYT/World Bank Group.
15
artículo
Publicado 2021
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The authors thank to Universidad Nacional de Tumbes, Universidad Nacional de Ingenieria and Fondo Nacional de Desarrollo Cientifico, Tecnologico y de Innovacion Tecnologica (Contrato No 02-2018-FONDECYT-BM-IADT-MU).
16
tesis de grado
Publicado 2012
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El objetivo de este trabajo fue determinar el incremento de la precipitación pluvial sobre la prevalencia de Renibacterium salmoninarum detectado a partir de muestras de tejido (riñón y bazo) de truchas arcoíris en una piscigranja ubicada en la cuenca del valle del Mantaro. El trabajo se realizó en una piscigranja del departamento de Junín, en la provincias de Huancayo, en los meses de agosto, setiembre noviembre y febrero, durante el periodo de ciclo de lluvias 2011-2012. La fuente hídrica de la piscigranja es el rio Chiapuquio, perteneciente a la cuenca del Valle del Mantaro. Las truchas fueron colectadas al azar y provenían de ovas nacionales y americanas. Se colectaron 60 animales por muestreo, 240 truchas en total por piscigranja, considerando una prevalencia de 5%. Los peces se recolectaron en relación al ciclo de lluvias en el valle del Mantaro. Agosto (Temporada seca), S...
17
artículo
Publicado 2022
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Argulus yawewitus n. sp. is described from pirarucu, Arapaima gigas (Shinz, 1822) from a fish farm in Northeast Brazil. The characteristics that distinguish it from other species are shape of the carapace, abdomen, respiratory areas, the ornamentation and morphology of the antena and antennule, the sexual dimorphism that distinguishes female from male, and the flag-like protrusions on the male’s second and third pair of legs.
18
artículo
Publicado 2021
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Essential oils are products from aromatic plants, which, due to their biological, allelopathic, antioxidant and antimicrobial effects, are important for food preservation. Kajikia audax is a fish of great commercial importance, however, it is highly perishable, requiring strategies to extend its shelf life. In vitro antimicrobial activity of Bursera graveolens essential oil was determined against microorganisms isolated from K. audax. Essential oil was extracted by steam distillation, obtaining a yield of 1.25%, a density of 0.83 g/ml and a refractive index of 1.473°, in addition, it was determined by GC-MS that D-limonene (77.6%) is the majority compound. Antimicrobial tests showed that the minimum inhibitory concentration (MIC) for Aeromonas salmonicida and Pichia kudriavzevii was 1.62 mg/ml and 6.48 mg/ml respectively, and the minimum bactericidal concentration (MBC) was 25.92 mg/ml ...
19
artículo
Publicado 2018
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La gamitana es un pez originario de las cuencas de los ríos Amazonas y Orinoco, con una demanda creciente en el Perú, especialmente en los supermercados y restaurantes de comida típica de la selva, con una demanda aproximada de 600 kilos/semana, debido a la calidad del producto, por sus propiedades organolépticas homogéneas, su estricto control de calidad, sus certificaciones y auditoria del producto.Los objetivos de este estudio son redefinir la estrategia y rediseñar la cadena de suministro de Puñizas SAC, empresa familiar ubicada en Junín dedicada a la producción y distribución de la gamitana a los supermercados y restaurantes de comida de la selva en Lima, para añadir valor a los clientes enfocado en el flujo del producto (la gamitana).
20
artículo
Publicado 2018
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The gamitana is a fish native to the Amazon and Orinoco River basin, with a growing demand in Peru, especially in supermarkets and restaurants specializing in traditional Amazonian jungle cuisine, with an estimated demand of approximately 600 kilos per week, due to the product’s quality, homogeneous organoleptic properties, strict quality control, certifications and product auditing.The objectives of this study are to redefine the strategy and redesign the supply chain of Puñizas SAC, a familyrun company located in Junín dedicated to gamitana production and distribution to supermarkets and Amazonian restaurants in Lima, in order to add value to clients focused on product (gamitana) flow.
