Efectos de prebióticos sobre el crecimiento y la supervivencia de juveniles de Rhamdia quelen

Recientemente se han obtenido evidencias que demuestran las ventajas de la utilización de microorganismos benéficos o aditivos orgánicos como promotores del crecimiento en reemplazo de agentes quimioterapéuticos y antimicrobianos. El objetivo del presente trabajo fue evaluar el efecto de un alimento suplementado con un reparador metabólico a base de flavonoides (FLAVOXIN®) y otro con una combinación de ácidos orgánicos y pared de levadura (UNIWALL MOS 50®), sobre parámetros de crecimiento y supervivencia en juveniles de Rhamdia quelen, contrastados con un alimento control. Se utilizaron tres tratamientos alimentarios: control consistente en dieta comercial con 280g de proteínas/kg y 120g de lípidos/kg, dieta comercial suplementada con FLAVOXIN® (FL), y dieta comercial suplementada con UNIWALL MOS® (MOS), ambos productos adicionados a razón de 2g/kg. Nueve lotes de 42 ejemplares distribuidos en estanques de mampostería a cielo abierto de 16m3 fueron asignados de acuerdo a un diseño en cuadrado latino 3×3. La experiencia tuvo una duración total de 60 días, verificándose un incremento de peso en todos los tratamientos alimentarios, aunque sin diferencias estadísticamente significativas entre los mismos (p>0,05). El porcentaje de supervivencia fue de 89% en la dieta control y de 97 y 95% para FL y MOS, respectivamente, resultando ambos tratamientos estadísticamente superiores al control (p0.05). The survival rate was 89% for the control diet and 97 and 95% for FL and MOS, respectively. Both FL and MOS treatments resulted superior and statistically different to the control diet (p<0.05). The results show that the use of FLAVOXIN® and UNIWALL MOS 50® at the dose employed for this study has a positive effect on survival of R. quelen juveniles, without modifying growth parameters.Fil: Hernandez, David Roque. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; ArgentinaFil: Santinón, Juan José. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Sánchez, Sebastián. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; ArgentinaFil: Domitrovic, Hugo Alberto. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Localization and distribution of CCK-8‑, NPY‑, Leu-ENK-, and Ghrelin- in the digestive tract of prochilodus lineatus (Valenciennes, 1836)

This study describes the histological characteristics and distribution of gastrointestinal tract endocrine cells (ECs) of Prochilodus lineatus (detritivorous fish) using immunohistochemical procedures. The digestive tract of P. lineatus was divided into seven portions: stomach (cardial and pyloric), pyloric caeca, and intestine (anterior, glandular, middle and posterior). A pool of specific antisera against cholecystokinin (CCK-8), -neuropeptide Y (NPY), -ghrelin (Ghre) and -leu-enkephalin (Leu-ENK) to identify ECs were used. According to the morphological characteristics of ECs, two different types were identified and classified as open or closed-type. The number of ECs varied throughout the gastrointestinal tract, though a high abundance was found in the anterior intestine and pyloric caeca. A large number of ECs immunoreactive to CCK-8 and NPY were recorded in the anterior, glandular and middle intestine. ECs immunopositive to Leu-ENK were distributed in the stomach and pyloric caeca. For Ghre, immunopositive ECs were restricted to the glandular intestine. The results of the present study indicate that P. lineatus presents an ECs distribution pattern with species-specific particularities. However, CCK showed a distribution similar to that of omnivores, which is possibly related to local signaling functions in order to achieve the correct digestion of the various organisms found in the detritus.Fil: Barrios, Carlos Eduardo. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Santinón, Juan José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Domitrovic, Hugo Alberto. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Sánchez, Sebastián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Hernandez, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentin

Neutralizing capacity of antisera obtained by immunization with Bothrops alternatus venom blocked in its metalloproteinases

Specific treatment for snake bite accidents with antivenoms, obtained from immunized animals, is the only recommended therapy. Bothropic intoxication is characterized by proteolytic, coagulant and hemorrhagic effects that induce local tissue damage and systemic alterations that could lead to death. Snake venom metalloproteinases, zinc- dependent, play a relevant role in the pathogenesis of intoxication. They provoke a disruption of the hemostatic system, restricting their use as immunogen in high doses. In previous work, it was demonstrated that is it possible to immunize mice with high doses of Bothrops alternatus venom (BaV) neutralized with disodium salt of ethylenediaminetetraacetic acid (Na2EDTA) avoid of hemorrhagic lesions and then animals reported higher antibodies titer. The present study was performed to test the neutralizing ability of sera obtained from animals treated whit venom-Na2EDTA, and evaluate the effect of this immunogen on pulmonary parenchyma. Groups of 5 Balb/c mice were immunized subcutaneously with BaV, or BaV/Na2EDTA emulsified with Freund?s Adjuvant (complete first and incomplete-booster). On day 50 serums were collected for neutralization assays: proteolytic activity on azocasein, phospholipase activity on erythrocytes and thrombine-like activity on citrated plasma. Animals were sacrificed and lungs removed for histological analysis (hematoxylin-eosin). The results showed that the capacity of neutralize each of one of the three enzyme activities assayed was significantly higher (p <0.05) by the serum obtained from animals immunized with BaV/Na2EDTA. Histological analysis showed that the pulmonary parenchyma from immunized mice with BaV was significantly affected (pneumonitis, p <0.05), in respect to those were BaV/Na2EDTA treated. Results demonstrated that the BaV/Na2EDTA immunogen has a lower organic impact with respect to BaV and, at the same time, providing a serum with high neutralizing capacity.Fil: López, Gisela Lumila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Química Básica y Aplicada del Nordeste Argentino. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Química Básica y Aplicada del Nordeste Argentino; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Departamento de Bioquímica. Laboratorio de Investigación en Proteínas; ArgentinaFil: Hernandez, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Leiva, Laura Cristina Ana. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Departamento de Bioquímica. Laboratorio de Investigación en Proteínas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Química Básica y Aplicada del Nordeste Argentino. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Química Básica y Aplicada del Nordeste Argentino; ArgentinaFil: Fusco, Luciano Sebastian. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Departamento de Bioquímica. Laboratorio de Investigación en Proteínas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Química Básica y Aplicada del Nordeste Argentino. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Química Básica y Aplicada del Nordeste Argentino; ArgentinaFil: Van de Velde, Andrea Carolina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Departamento de Bioquímica. Laboratorio de Investigación en Proteínas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Química Básica y Aplicada del Nordeste Argentino. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura. Instituto de Química Básica y Aplicada del Nordeste Argentino; ArgentinaLXIV Reunión Anual de la Sociedad Argentina de Investigación Clínica; LI Reunión Anual de la Asociación Argentina de Farmacología Experimental; XXI Reunión Anual de la Sociedad Argentina de Biología; XXXI Reunión Anual de la Sociedad Argentina de Protozoología; IX Reunión Anual de ka Asociación Argentina de Nanomedicinas y VI Reunión Científica Regional de la Asociación Argentina de Ciencia y Tecnología de Animales de LaboratorioMar del PlataArgentinaSociedad Argentina de Investigación ClínicaAsociación Argentina de Farmacología ExperimentalSociedad Argentina de BiologíaAsociación Argentina de NanomedicinasAsociación Argentina de Ciencia y Tecnología de Animales de LaboratorioSociedad Argentina de Protozoologí

Variação espaço-temporal do ictioplâncton em um trecho do río Paraná

El objetivo del estudio fue determinar la ocurrencia de desoves y su variación espacio-temporal a partir de la abundancia de ictioplancton en un tramo del río Paraná aguas abajo de la represa de Yacyretá, provincia de Corrientes, Argentina. Se tomaron muestras con frecuencia quincenal con una red cilindro-cónica de 500μm de apertura de malla durante tres ciclos anuales consecutivos (septiembre a abril). En todos los ciclos se observaron picos de abundancia de ictioplancton, evidenciándose una correlación positiva entre los diferentes sitios de muestreo. Los resultados indicarían que los desoves se producen aproximadamente en el mismo período y estrechamente relacionados a los aumentos de los regímenes hidrológicos. La presencia de ictioplancton en tres ciclos anuales consecutivos permite determinar la existencia de buena actividad reproductiva, aunque las variaciones temporales de la densidad ictioplanctónica reflejan la ocurrencia de mecanismos desencadenantes de los desoves fuertemente relacionados al régimen hidrológico.The aim of this study was to determine the occurrence of spawning and its spatial-temporal variation, from the ichthyoplankton abundance in a section of the Paraná River downstream of the Yacyretá dam, Corrientes province, Argentina. Samples were collected every two weeks with a 500µm mesh cylindro-conical net during three consecutive annual cycles (September to April). In all cycles, ichthyoplankton abundance peaks were observed, showing a positive correlation between the different sampled sites. The results indicate that spawning occurs at approximately the same period and is closely related to the flood period. The presence of ichthyoplankton in three consecutive annual cycles determines the existence of important reproductive activity, although the temporal variation of ichthyoplankton density reflects the occurrence of spawning trigger mechanisms closely related to the hydrological regime.O objetivo do estudo foi determinar a ocorrência de desovas do ictioplâncton e sua variação espaço-temporal a partir da abundância de ovos e larvas de peixes, em um trecho do rio Paraná abaixo da represa de Yacyretá, província de Corriente, Argentina. Recolheram-se amostras com frequência quincenal utilizando uma rede cilindro-cônica de 500μm de abertura da malha durante três ciclos anuais consecutivos (setembro até abril). En todos los ciclos foram observados picos de abundância de ictioplâncton, evidenciando-se una correlação positiva entre os diferentes locais de amostragem. Os resultados poderiam indicar que as desovas acontecem aproximadamente no mesmo período e estão fortemente relacionadas ao aumento dos regimes hidrológicos. A presença de ictioplâncton em três ciclos anuais consecutivos permite determinar a existência de uma boa atividade reprodutiva, embora as variações temporais da densidade ictioplanctônica revelem a ocorrência de mecanismos desencadeantes de desovas fortemente relacionadas ao regime hidrológico.Fil: González, Alfredo Oscar. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Roux, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Hernandez, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Sánchez, Sebastián. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentin

Fattening of ramdiá (Rhamdia quelen) in intensive culture system by separated sexes

El bagre sudamericano (ramdiá o jundiá) se caracteriza por rápido crecimiento en los primeros meses de vida e importante diferencia de desarrollo entre ambos sexos. La madurez sexual del macho es precoz, por lo cual la hembra alcanza un peso vivo 30% mayor que el del macho. El presente trabajo tuvo por objetivo analizar el engorde de especimenes de Rhamdia quelen separados por sexos en un sistema intensivo. Se llevaron a cabo tres tratamientos: TA- hembra, TB- mixto y TC- macho. El engorde se realizó en cajas plásticas de 30 litros de capacidad. Se utilizaron 81 ejemplares, cuyos pesos medios fueron de 49,30 y 42,90 g para hembras y machos respectivamente. Los peces se distribuyeron a razón de 9 ejemplares por caja, con una densidad de 300 individuos/m3. El ensayo tuvo una duración de 60 días. Las variables analizadas fueron: coeficiente de crecimiento específico, consumo diario, tasa de conversión alimenticia, tasa de supervivencia, biomasa total producida, porcentaje de cabeza, rendimiento de carcasa (RC) e índice gonadosomático (IGS). No se observaron diferencias significativas entre los tratamientos para las variables estudiadas (p>0,05), pero cuando se compararon las variables de las hembras se encontró que RC e IGS resultaron significativamente diferentes entre los tratamientos A y B, con valores medios de 89,47 y 2,35% frente a 88,01 y 3,79%, respectivamente. Los valores de RC fueron similares a los reportados por otros autores, pero los de IGS fueron menores, en particular para las hembras. Las hembras TA tuvieron valores más bajos de IGS y más altos de RC que las hembras TB. Estos resultados indicarían que el engorde de R. quelen por sexos separados produce mejor rendimiento de carcasa en las hembras debido al menor índice gonadosomático. En contraste, no se encontraron estos cambios en los machos.The South American catfish (ramdiá or jundiá) is characterized by a fast growth during the first months of life, and an important difference of development between sexes. Female reaches 30% more living weight than males, because the latter become sexually mature faster. The aim of this study was to analyze the fattening of Rhamdia quelen by separated sexes in an intensive system. Three treatments were made: TA- female, TB- mix and TC- male. Fattening was carried out in 30 l plastics boxes. Eighty one specimens were used, with an average weight of 49.30 g for female and 42.90 g for male. Nine fishes per box were distributed at a density of 300 fishes/m3 . The essay lasted 60 days. Analyzed variables were: specific growth coefficient, daily food intake, feed conversion rate, survival rate, total biomass produced, head percentage, carcass performance (RC), and gonadosomatic index (IGS). No significant differences were found among treatments for the studied variables (p>0.05). By comparing the variables between sexes, it was found that RC and IGS from TA had significant differences compared to TB, with average values of 89.47 and 2.35% versus 88.01 and 3.79% respectively. RC values were similar to those of other authors, but IGS were lower, particularly in females. Females from TA had lower values of IGS and better performance values of RC than the females from TB. These results may suggest that better RC values due to lower IGS can be obtained when females and males are grown separately. Physical sex separation of R. quelen during the fattening stage produces a better carcass performance in females because of their decreased gonadosomatic index. In contrast, these changes were not found in malesFil: Comolli, Javier Alejandro. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Roux, Juan Pablo. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Nordeste; ArgentinaFil: Sánchez, Sebastián. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; ArgentinaFil: Hernandez, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiologia del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Nordeste; Argentin

Impact of COVID-19 on cardiovascular testing in the United States versus the rest of the world

Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-US institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic. Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Methods: Data were submitted to the INCAPS-COVID (International Atomic Energy Agency Non-Invasive Cardiology Protocols Study of COVID-19), a multinational registry comprising 909 institutions in 108 countries (including 155 facilities in 40 U.S. states), assessing the impact of the COVID-19 pandemic on volumes of diagnostic cardiovascular procedures. Data were obtained for April 2020 and compared with volumes of baseline procedures from March 2019. We compared laboratory characteristics, practices, and procedure volumes between U.S. and non-U.S. facilities and between U.S. geographic regions and identified factors associated with volume reduction in the United States. Results: Reductions in the volumes of procedures in the United States were similar to those in non-U.S. facilities (68% vs. 63%, respectively; p = 0.237), although U.S. facilities reported greater reductions in invasive coronary angiography (69% vs. 53%, respectively; p < 0.001). Significantly more U.S. facilities reported increased use of telehealth and patient screening measures than non-U.S. facilities, such as temperature checks, symptom screenings, and COVID-19 testing. Reductions in volumes of procedures differed between U.S. regions, with larger declines observed in the Northeast (76%) and Midwest (74%) than in the South (62%) and West (44%). Prevalence of COVID-19, staff redeployments, outpatient centers, and urban centers were associated with greater reductions in volume in U.S. facilities in a multivariable analysis. Conclusions: We observed marked reductions in U.S. cardiovascular testing in the early phase of the pandemic and significant variability between U.S. regions. The association between reductions of volumes and COVID-19 prevalence in the United States highlighted the need for proactive efforts to maintain access to cardiovascular testing in areas most affected by outbreaks of COVID-19 infection

Design and baseline characteristics of the finerenone in reducing cardiovascular mortality and morbidity in diabetic kidney disease trial

Background: Among people with diabetes, those with kidney disease have exceptionally high rates of cardiovascular (CV) morbidity and mortality and progression of their underlying kidney disease. Finerenone is a novel, nonsteroidal, selective mineralocorticoid receptor antagonist that has shown to reduce albuminuria in type 2 diabetes (T2D) patients with chronic kidney disease (CKD) while revealing only a low risk of hyperkalemia. However, the effect of finerenone on CV and renal outcomes has not yet been investigated in long-term trials. Patients and Methods: The Finerenone in Reducing CV Mortality and Morbidity in Diabetic Kidney Disease (FIGARO-DKD) trial aims to assess the efficacy and safety of finerenone compared to placebo at reducing clinically important CV and renal outcomes in T2D patients with CKD. FIGARO-DKD is a randomized, double-blind, placebo-controlled, parallel-group, event-driven trial running in 47 countries with an expected duration of approximately 6 years. FIGARO-DKD randomized 7,437 patients with an estimated glomerular filtration rate >= 25 mL/min/1.73 m(2) and albuminuria (urinary albumin-to-creatinine ratio >= 30 to <= 5,000 mg/g). The study has at least 90% power to detect a 20% reduction in the risk of the primary outcome (overall two-sided significance level alpha = 0.05), the composite of time to first occurrence of CV death, nonfatal myocardial infarction, nonfatal stroke, or hospitalization for heart failure. Conclusions: FIGARO-DKD will determine whether an optimally treated cohort of T2D patients with CKD at high risk of CV and renal events will experience cardiorenal benefits with the addition of finerenone to their treatment regimen. Trial Registration: EudraCT number: 2015-000950-39; ClinicalTrials.gov identifier: NCT02545049

Educación ambiental y sociedad. Saberes locales para el desarrollo y la sustentabilidad

EL LIBRO PERMITE REFLEXIONAR SOBRE LA IMPORTANCIA DE FOMENTAL LA EDUCACIÓN AMBIENTAL PARA RESOLVER LA PROBLEMÁTICA AMBIENTALEL LIBRO PRESENTA DIFERENTES TRABAJOS QUE ESTUDIAN EL TEMA D ELA SUSTENTABILIDAD, ENFATIZANDO LA IMPORTANCIA DE LA EDUCACIÓN AMBIENTAL Y LA TRANSDISCIPLINANINGUN

Morfología, Histología e Histoquímica del Tubo Digestivo del Bagre Sudamericano (Rhamdia quelen)

The purpose of the present work was the anatomical, histological and histochemical description of Rhamdia quelen juvenile digestive system. Samples of gut were fixed, dehydrated and included in paraffin and then stained with haematoxylin and eosin. For the identification and differentiation of mucosubstances the preparations were treated with Periodic Acid Schiff, Alcian Blue pH 0,4 and 2,5 and PAS/AB pH 2,5. Anatomical details of the oesophagus were like a short tube with primary and secondary mucous folds. The stratified epithelium is composed of three cellular types: small cells, abundant goblet cells with acid and neutral mucosubstances (MS) and large acid cells. The stomach is J-shaped and its mucosa presents broad and deep folds in relaxing state. Histologically, the stomach shows three different regions: cardiac, fundic and pyloric region. The luminal surface of the epithelium consists of a layer of secretory columnar cells of neutral MS. Tubuloacinar glands were surrounded by connective and muscular smooth fibers bundle. The intestine extends from the stomach until the anus, and four different sections can be distinguished: ascending, descending, convoluta and terminal straight. It was identified a simple columnar epithelium mainly composed by two cellular types: absorptive cell and goblet cell neutral MS secretory. On the basis of the anatomical and histological study carried out, we conclude that R. quelen presents an alimentary canal compatible with species that possess omnivorous nutritious habits.Fil: Hernandez, David Roque. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Perez Gianiselli, Mónica. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Domitrovic, Hugo Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentin

Hatchery duration influence on posterior performance of jundiá fingerlings, Rhamdia quelen, reared in cages

Realizou-se um experimento fatorial 3x2, com três repetições (n=18), a fim de avaliar o crescimento e a sobrevivência de juvenis de jundiá (Rhamdia quelen) recriados em tanques-rede e dispostos em tanques externos até os 65 dias de vida. Os peixes utilizados provêm de um sistema de larvicultura intensiva, em que foram alimentados em laboratório com três rações diferentes até os 10 e 15 dias de vida, antes de serem transferidos para os tanques-rede. Uma vez nos tanques-rede, os peixes foram alimentados até a saciedade com ração balanceada comercial contendo 28% de proteína bruta. Ao final do ensaio, não foram observadas diferenças significativas entre os tratamentos para nenhum dos parâmetros estimados (P>0,05). Da mesma maneira, os valores de crescimento e sobrevivência obtidos foram similares entre os grupos de peixes transferidos aos 10 e 15 dias de vida. Os resultados demonstram que a passagem das larvas de jundiá para os tanques-rede de recria aos 10 dias de vida seria o manejo mais recomendável, diminuindo os custos da alimentação e operativos que implicam o estágio de larvicultura sob condições controladas de laboratório.A 3x2 factorial trial with three replicates (n=18) was carried out aiming to evaluate Rhamdia quelen fingerling growth and survival rates, stocked in cages, in external ponds until attain 65 days of life. Fish used come from an intensive hatchery system, where were fed in laboratory with three different diets until attain 10 and 15 days old, before being transferred to cages. Once in cages, fishes were fed until satiation with commercial balanced diet containing 28% crude protein. At the end of the experience, there were no significant differences between treatments for any of the estimated parameters (P>0.05). Similarly, the values of growth and survival obtained were similar between the groups of fish transferred with 10 and 15 days old. The results show that transference of 10 days old catfish larvae to the cages would be the more appropriate management, reducing feeding and operating costs that involves the larviculture under controlled laboratory conditions.Fil: Santinón, Juan José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Hernandez, David Roque. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Sánchez, Sebastián. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; ArgentinaFil: Domitrovic, Hugo Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias. Instituto de Ictiología del Nordeste; Argentin