Corydoras gladysae can live in strong brackish water!

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Corydoras gladysae can live in strong brackish water!

Post by bekateen »

and

Cruz, R. A., Sánchez, R. O., & Martínez, V. H. (2023). Diversidad celular del epitelio branquial de dos especies endémicas del género Corydoras que habitan ambientes con diferente salinidad. Revista Ciencias Naturales, 1(1), 49-58.
http://eprints.natura.unsa.edu.ar/1293/
PDF: http://eprints.natura.unsa.edu.ar/1293/ ... anchez.pdf
Abtract
The small armored catfish, Corydoras gladysae and Corydoras petracinii, are two endemic species of northwestern Argentina in the province of Salta, which live in wetlands of the Calchaquí River and the San Lorenzo River, respectively. Both environments differ in their saline concentration, being very high in the Calchaquí River. We studied the gills of both species, because these organs are multifunctional since, in addition to carrying out gas exchange, they carry out another series of critical functions such as ion regulation and maintenance of acid-base balance. The organs were processed with routine techniques for histology and scanning electron microscopy. The gill morphology of both species is characteristic for the genus, with wide gill arches, thick filaments, and short respiratory lamellae that respond to air-breathing species. The branchial epithelium presents a great cellular diversity: squamous, chlorid [sic], mucosal and neuroepithelial cells, its distribution is very defined in the gill filaments. The chloride cells responsible for ion regulation are particularly more abundant and larger in Corydoras gladysae, where the waters in which they live register concentrations above 1300 µS [color emphasis added]. The differences in the chloride cells between the species could be an adaptive character to the higher concentration of salts.
Keywords: chloride cells; Corydoras; gills; histology.
Resumen
Los pequeños bagres acorazados, Corydoras gladysae y Corydoras petracinii, son dos especies endémicas del noroeste argentino en la provincia de Salta, que viven en humedales del río Calchaquí y el río San Lorenzo respectivamente. Ambos ambientes difieren por su concentración salina, siendo muy alta en el río Calchaquí. Estudiamos las branquias de ambas especies, debido a que estos órganos son multifuncionales ya que además de realizar el intercambio gaseoso, llevan a cabo otra serie de funciones críticas como la ionorregulación y la mantención del balance ácido-base. Los órganos se procesaron con técnicas de rutina para histología y microscopía electrónica de barrido. La morfología de la branquia de ambas especies es característica para el género, con arcos branquiales anchos, filamentos gruesos y cortas laminillas respiratorias que responden a especies que respiran aire. El epitelio branquial presenta una gran diversidad celular: pavimentosas, clorideas, mucosa y neuroepiteliales; su distribución es muy definida en los filamentos branquiales. Las células clorideas responsables de la ionorregulación son particularmente más abundantes y grandes en C. gladysae, donde las aguas en las que habita registran concentraciones superiores a 1300 µS [Énfasis de color agregado]. Las diferencias en las células clorídeas entre las especies podría ser un carácter adaptativo a la mayor concentración de sales.
Palabras clave: branquias; células clorídeas; Corydoras; histología.

From the methods section of the paper:
Los ejemplares de Corydoras gladysae fueron capturaron en humedales vegetados paralelos al brazo principal del río Calchaquí, a unos 800 metros al sureste del puente de entrada a Cachi; el cuerpo de agua registró al momento de la captura una conductividad de 1279 µS. C. petracinii fue capturada en pozones vegetados del río San Lorenzo, a la altura de Lomas de Medeiros a unos 200 metros al oeste de la Av. Circunvalación Oeste en la Capital de Salta; al momento de la captura se registró una conductividad de 176 µS.
The specimens of Corydoras gladysae were captured in vegetated wetlands parallel to the main branch of the Calchaquí River, about 800 meters southeast of the Cachi entrance bridge; the body of water recorded a conductivity of 1279 µS at the time of capture. C. petracinii was captured in vegetated pools of the San Lorenzo River, at the height of Lomas de Medeiros, about 200 meters west of Circunvalación Oeste Avenue in the Capital of Salta; at the time of capture, a conductivity of 176 µS was recorded.
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Re: Corydoras gladysae can live in strong brackish water!

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Biotope challenge! :-)

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Re: Corydoras gladysae can live in strong brackish water!

Post by bekateen »

Jools wrote: 18 Apr 2023, 20:22Biotope challenge! :-)

Jools
Agreed. I wonder if the fish are spawning at this salinity, or just surviving certain seasons of the year.

Cheers, Eric
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