Ricardo Jimenez-Montealegre

National University of Costa Rica | UNA

Sciaenidae is the family of marine fish that has the highest aquaculture growth and production in the world. In this study, the global production, historical characteristics, biological aspects, and aquaculture technologies used for the Sciaenid species with the highest aquaculture production were compiled and analyzed to determine the success fact...

AQUACULTURE OF THE SCIAENIDAE FAMILY: MAIN SPECIES CULTIVATED WORLDWIDE AND EMERGING SPECIES IN LATIN AMERICA

Con el objetivo de evaluar la posible afectación del emisario submarino en la ciudad de Limón, sobre el medio marino circundante, se establecieron 6 estaciones de muestreo, 4 de ellas cercanas a la zona de desfogue y 2 controles; en cada una se tomaron muestras de agua a 0 m y 10 m durante el 2012-2013 para medir nutrimentos, parámetros fisicoquími...

Currently, nitrogen has become the main element of water pollution, causing riverine, lacustrine and coastal eutrophication. The continuous contamination of aquifers and the absence of planned water resource utilization, boost its scarcity, and has been the only way in which our societies become aware of the urgent need to process the generated was...

Se evaluó el efecto del flujo de agua sobre la eficiencia de tapetes microbianos para remover nitrógeno amoniacal total (NAT, N-NH4+ + N-NH3), nitritos (N-NO2-), nitratos (N-NO3-) y ortofosfatos (P-PO4-3) en un sistema de recirculación piloto para el cultivo de camarón blanco del Pacífico, Litopenaeus vannamei. Se evaluaron cuatro flujos de agua du...

La sobreexplotación pesquera y la búsqueda de alternativas ante la pobreza crónica han llevado a explorar el campo de la maricultura por medio de un enfoque ecosistémico se abrieron dos procesos paralelos: una estrategia e; investigación en laboratorio para el levantamiento larval de peces marinos tropicales y una estrategia de comanejo para desarr...

Using a participatory process and management strategy, Parque Marino del Pacífico and the Universidad Nacional created a pilot laboratory juvenile production program. Lack of expertise and finance were avoided by joining efforts with ther public agencies. Cooperation from ICDF helped support the critical phases, including the creation of a marine p...

A great variety of species of snappers are cul-tivated in Asia, and others recently studied inMexico, Australia and the United States. In CostaRica, the Marine Park of the Pacific has increasedthe production of juveniles from 10,000 in 2005,to 30,000 by july 2007. The goal is to reach the100,000 juveniles by the end of 2008 (PDF) Rose snapper mar...

Water samples were collected at several points along the Pacific coast of Costa Rica (10°00'N, 84°15'E) fortnightly from January 2003 to June 2004. During this period, dense red-ochre discolourations dominated by Cochlodinium polykrikoides were observed, particularly over the dry season. In 2003, the highest cell density of 1.75 × 108 cells l−1 was...

Abstract In aquaculture, ponds with high loads of organic inputs, organic matter accumulates at the bottom over time. Uneaten feed, senescent phytoplankton and faeces are the principal sources of accumulated material, but quantifications are scarce. The sedimented organic matter develops into a flocculent layer in which different processes transfor...

Three experiments were conducted to analyze the effect of the probiotic Bacillus subtilis on the growth of juvenile tilapia (Oreochromis niloticus) and freshwater prawn (Macrobrachium rosenbergii). The experiments were conducted under laboratory conditions, minimizing the indirect effects of the probiotic on the water quality and leaving only the p...

Effect of the probiotic Bacillus subtilis on the growth and food utilization of tilapia (Oreochromis niloticus) and prawn (Macrobrachium rosenbergii) under laboratory conditions. Three experiments were conducted to analyze the effect of the probiotic Bacillus subtilis on the growth of juvenile tilapia (Oreochromis niloticus) and freshwater prawn (M...

This study quantified the accumulation of nitrogen (N) in the water column, sediments, fish and seepage water during a production cycle of Colossoma macropomum. By combining estimates of the deposition rates of uneaten feed, faeces and dead phytoplankton with measurements of N accumulation in the sediment, the rate of decomposition of organic matte...

The rates of sedimentation and resuspension of organic carbon and total nitrogen were measured in earthen fishponds, based on nutrient input, water quality parameters and fish size and biomass. Material collected in sediment traps and soil samples were analyzed for organic carbon, total nitrogen, iron and aluminum concentrations. A dilution analysi...

Nitrogen is a key element in aquatic environments and an important pond management variable. In aquaculture systems, nitrogen accumulation eventually leads to a deterioration of the system. The interactions between various N-species are complex and difficult to integrate. Modelling can improve our ability to evaluate this complex system. This paper...

The rates of sedimentation and resuspension of organic carbon and total nitrogen were measured in earthen fishponds, based on nutrient input, water quality parameters and fish size and biomass. Material collected in sediment traps and soil samples were analyzed for organic carbon, total nitrogen, iron and aluminum concentrations. A dilution analysi...

Nitrogen is a key element in aquatic environments, and in Aquaculture it is an important pond management variable. In current aquaculture research two important goals are to maintain the water quality within the system, and to improve the retention of nutrients applied to the system in order to minimize the discharge. The principal objectives of th...

The occurrence of phytoplankton blooms is a common problem in water bodies. The quantitative description of the algal population growth is of primary importance to understand the mechanisms which lead to these phytoplankton blooms, hence also for the development of a successful water-quality management. Due to the high degree of complexity of phyto...