Abstract
This research aimed to estimate the length-weight ratio (LWR) of the stingray Potamotrygon wallacei, known locally as the cururu, which was caught in streams and lakes in the middle Negro River region, Amazonas, Brazil. The stingrays were captured during the night (from 11 pm to 1 am) near the shores of streams and lakes, through active search using wooden canoes, head lanterns and scoop nets. The samplings were carried out in November 2017 (5 days), February (8 days), March (3 days) and April (2 days) of 2018, totaling 18 days of sampling. The total fresh weight was measured to 0.1 g of accuracy and the disc width to 0.1 cm accuracy. The parameters a and b of the equation W=a.DWb were estimated. This study provides new maximum length data for the cururu stingray.
Highlights
The Neotropical freshwater stingrays belong to the subfamily Potamotrygoninae and are the only group of elasmobranchs that are exclusive to freshwater (Carvalho et al, 2016b)
The present study describes the length-weight ratio (LWR) of the cururu stingray (Potamotrygon wallacei) caught in streams and lakes in the middle Negro River region, Amazonas, Brazil, where so far, no studies have yet been published on the subject
The length-weight relationships calculated for cururu stingray (P. wallacei) (Table 1), showed the coefficient of determination (r2) ranged from 0.981 to 0.996, a values ranged from 0.0586 to 0.0409, and b values ranged from 2.9285 to 3.0323
Summary
The Neotropical freshwater stingrays belong to the subfamily Potamotrygoninae and are the only group of elasmobranchs that are exclusive to freshwater (Carvalho et al, 2016b). Composed of 38 species distributed in four genera (Silva and Loboda, 2019), Potamotrygoninae are found in almost all major river basins in South America (Carvalho, 2016), with maximum species diversity in the Amazon (28 species) Their fascinating and varied dorsal colors make them desirable highly to aquarists and a target species in the international trade of ornamental fish (Fontenelle and Carvalho, 2016). The cururu stingray (Potamotrygon wallacei Carvalho, Rosa and Araújo, 2016) is a small species, which is endemic to the middle Negro River and can be found mainly in the areas of shoreline of the flooded forests (igapós); this being its preferred habitat (Duncan et al, 2016; Araújo, 2021)
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