Tomás Maiztegui

Instituto de Limnología "Dr. Raúl A. Ringuelet" | ILPLA · Fish Ecology

The Steelhead ecotype (Oncorhynchus mykiss) and chinook salmon (Oncorhynchus tshawytscha) have promoted a recreational fishery in the Santa Cruz river, the last large free flowing river of Patagonia. However, two dams are being built upstream in the middle course, potentially affecting the life cycle of these anadromous salmonids. The study describ...

The study focuses on understanding the influence of the environment on the relative yields of a gill net fishery operating in San Antonio Cape, Argentina. The research was conducted during five austral warm periods covering spring to summer from 2008 to 2013, aiming to assess the potential impacts of climate change on smallscale fisheries. The hier...

in the Session "Invasive Aquatic Species" of the XI FIRMA 2022, specialists from four countries (Argentina, Chile, España and Venezuela) presented five examples of invasive aquatic species 1- Non-native bivalves of South America. 2- Expansion of the Cyprinus carpio fish in Argentina. 3- Invasive macroalgae on the coast of Chile. 4- Impact and manag...

Few studies have addressed the composition of fish assemblages of the freshwater Río de la Plata (RdlP) and have only been limited to species lists gathered over the last two centuries. As such inventories have never been reviewed or validated by fish sampling, the richness and structure of RdlP fish assemblage are poorly known. Hence, we conducted...

The Patagonian steppe is a vast territory with a diverse array of aquatic environments with low fish richness, including several exotic species which are mostly salmonids. Unlike the Andean region, knowledge of the ichthyofauna and fisheries of the Patagonian plateau is comparatively scarce. The characteristics of the ichthyofauna and their assembl...

Headwater streams play an essential role in catchment ecosystem processes and are particularly vulnerable to land use degradation and anthropic hydrological alterations. Considering that fish assemblages are reliable indicators of the ecological integrity of streams, we evaluated the ichthyofauna structure in four headwater Pampean streams located...

Riparian areas of riverine plains develop extensive floodable areas named riverine wetlands, which are essential to the water cycle balance and ecosystem dynamics. In this study, we contrasted the hydrological and physicochemical variables of riverine wetlands of both peri-urban areas impacted by intensive farming and those of rural areas with the...

The Matanza Riachuelo Basin is one of the most polluted watersheds in the world. We assessed the relationships between land use, stream-water quality, and the structure of the fish assemblages on a subbasin scale from data obtained in 44 sampling sites. A gradient of change from the rural upper sector to the urbanized and industrialized lower basin...

In recent years, the evolutionary history of the catfish genus Hypostomus has attracted much interest (Cardoso et al. 2021; Jardim de Queiroz et al. 2020; Silva et al. 2016). However, the identification of species of this genus is challenging, given the complex taxonomy of the group and the scarce morphological information available for many taxa....

Las actividades humanas en los sistemas naturales promueven cambios que ponen en peligro a las comunidades acuáticas por pérdida de nichos ecológicos generando disminución de la riqueza y diversidad. El objetivo de esta investigación fue analizar los ensambles de aves y peces asociados a cuatro bañados de arroyos pampeanos con usos del suelo periur...

The present study reported the effect of natural and anthropic environmental variables on the fish assemblages in the pampean streams, in the coastal strip along the Río de la Plata, Buenos Aires province, Argentina. Five streams were sampled at 12 sites surrounded by land devoted to different uses. A correspondence analysis sorted the streams into...

In South America, the order Atheriniformes includes the monophyletic genus Odontesthes with 20 species that inhabit freshwater, estuarine and coastal environments. Pejerrey Odontesthes argentinensis is widely distributed in coastal and estuarine areas of the Atlantic Ocean and is known to foray into estuaries of river systems, particularly in condi...

El Río de la Plata (RdlP) se caracteriza por su elevada inestabilidad ambiental, fuertemente influenciada por los vientos y las mareas. Esta situación ha condicionado históricamente desde lo logístico y económico a los estudios ictiológicos en este ambiente tan extenso. Con el objetivo de encontrar una alternativa para superar estas limitaciones y...

Common carp ( Cyprinuscarpio ) is a global invader that exhibits a wide distribution in Argentina, particularly in shallow lakes and wetlands of the Pampean region. The hydrological conditions of these environments are driven by variations in annual precipitation that determine inter annual changes in water levels leading to flood-drought cycles. T...

Exploracuátic@s es un proyecto de extensión que nació en el año 2015 y que se ha instalado como un espacio educativo y recreativo donde niños y adolescentes de El Retiro y Ringuelet (La Plata) interactúan con un paisaje tan cotidiano para ellos como lo es el arroyo “El Gato”. Desde un enfoque interactivo y lúdico los integrantes del proyecto buscan...

The presence of microplastics (MPs) in gut contents of coastal freshwater fish of the Rio de la Plata estuary was studied. Samples were taken in six sites where 87 fish belonging to 11 species and four feeding habits were captured. Presence of MPs was verified in the 100% of fish. The fibres represented the 96% of MPs found. The number of MPs in gu...

Ecological aquaculture systems consider the natural and social environments in which they are situated in the search to contribute to environmental sustainability. In South America, the aquaculture of the native zooplanktivorous fish Odontesthes bonariensis (“pejerrey”) has some constraints that could be overcome by applying extensive culture syste...

The La Plata River system can be defined as a funnel coastal plain tidal river with a semi-closed shelf at the mouth. La Plata River is both the world’s widest freshwater system and an estuary that drains the second largest basin in South America and the fifth largest in the world. The Rio de la Plata system is shared by Argentina and Uruguay and h...

Hydrological ecosystem services involve the regulation of water flows, the reduction of the flooding impact, the soil erosion and the sediment accumulation in the watercourses, also including the maintenance and improvement of the water quality, the aquiferous recharge and the aquatic habitats. The impermeability of the soil due to urbanization, th...

This study documents the presence of Cyprinus carpio in 119 natural environments and 49 artificial habitats in Argentina, showing an exponential increment of invaded locations over time since it was introduced in the nineteenth century. Geographic expansion patterns revealed that since its initial introduction, species records demonstrate an increm...

The lengthí weight relationships (LWR) of 29 teleost fish species from the shallow estuarine environments of the Samborombón Bay wetland (Rí­­o de la Plata, Argentina) were estimated. A total of 6,376 individuals belonging to 19 families were measured and weighed. The best represented family was Sciaenidae with 6 species, followed by Clupeidae (n =...

The main objective of this study was to know about the biology and the population ecology of the common carp (Cyprinus carpio) in Ajó Wetlands, to provide useful information for developing management strategies for this exotic species within this protected area. The field work covered a two years period, from April 2009 to March 2011, with 24 month...

The length–weight relationships (LWR) of 29 teleost fish species from the shallow estuarine environments of the Samborombón Bay wetland (Río de la Plata, Argentina) were estimated. A total of 6,376 individuals belonging to 19 families were measured and weighed. The best represented family was Sciaenidae with 6 species, followed by Clupeidae (n = 3)...

La Cuenca Matanza-Riachuelo se localiza al noreste de la provincia de Buenos Aires. El uso del suelo en la cuenca alta y media es predominantemente agrícola-ganadero con escasa urbanización, mientras que en la baja se encuentra la mayor urbanización e industrialización del país. El objetivo de este trabajo es describir y analizar la estructura de l...

El pejerrey es la especie de mayor importancia deportiva en lagos someros templados y embalses de Argentina y el desarrollo de su acuicultura data de cien años atrás. Un impedimento común para el desarrollo de la acuicultura del pejerrey es el pobre crecimiento que manifiesta bajo cultivo intensivo. El objetivo de este estudio fue evaluar la posibi...

Pampean lakes are characterised by the alteration of flood and drought periods which, in turn, influence the biotic communities; however, little is known about its effects on fish assemblage in an extended temporal scale. The aim of this work was to analyse the temporal variability of the fish assemblage in Chascomús Lake, the most studied shallow...

An experiment was conducted for 80 days at La Salada de Monasterio Lake (Buenos Aires, Argentina) to assess the effect of stocking density and natural food availability on the growth and production of zooplanktivorous juveniles of pejerrey (Odontesthes bonariensis) in extensive cage culture. Ten cages were installed and stocked with 33-day-old fish...

This study assesses for the first time the relationship between annual cycles of different biological indices with growth patterns of a marine pejerrey Odontesthes argentinensis population near its southern-distribution boundary in North Patagonia. The reproductive period is between September and November evidenced by an increase in the gonado-soma...

The use of Cheirodon interruptus as a sport fishing bait puts under serious pressure the pampean shallow lakes ecosystems, because it is mostly obtained from natural environments. This project aims to evaluate the possibility of developing the technological and biological know-how for a production system in captivity for sustainable use of the reso...