1999
DOI: 10.1590/s0034-71081999000300007
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Abstract: We provide morphological and morphometric descriptions of the developmental stages of Parauchenipterus galeatus, from the floodplain of the Upper Paraná River. Specimens were obtained by induced spawning. The species has large adhesive eggs with a double membrane. The incubation period is long, 65 hours at 27°C. The larvae are well developed at hatching, with relatively rapid larval development. Analysis of the morphometric data showed that the body parts of P. galeatus grow proportionately. Este trabalho teve… Show more

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Cited by 40 publications
(44 citation statements)
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“…Interestingly, even though S. parahybae migrate to mate, their progeny do not develop quickly. The embryonic development time showed by S. parahybae is similar to or even faster than non-migratory fish species, such as Hoplias malabaricus and Parauchenipterus galeatus, which hatched 44 h at 24-26.5°C and 64 h at 27-28°C AF, respectively (Sanches et al, 1999). However it must be considered that the experimental temperature for S. parahybae in the present study was lower (23°C) than most of the species above described, another reason for the slower development speed, since teleosts are ectothermic vertebrates.…”
Section: Discussionmentioning
confidence: 86%
“…Interestingly, even though S. parahybae migrate to mate, their progeny do not develop quickly. The embryonic development time showed by S. parahybae is similar to or even faster than non-migratory fish species, such as Hoplias malabaricus and Parauchenipterus galeatus, which hatched 44 h at 24-26.5°C and 64 h at 27-28°C AF, respectively (Sanches et al, 1999). However it must be considered that the experimental temperature for S. parahybae in the present study was lower (23°C) than most of the species above described, another reason for the slower development speed, since teleosts are ectothermic vertebrates.…”
Section: Discussionmentioning
confidence: 86%
“…The study of the initial life cycle phases is essential for elucidating both taxonomic and ecological issues (Sanches et al, 1999).…”
Section: Introductionmentioning
confidence: 99%
“…Novoa & Cataño-Vergara observaron en Sorubim cuspicaudus un diámetro promedio de1492 µm para los óvulos y de 3320 µm de longitud de las larvas recién eclosionadas, mientras que Clavijo-Ayala & Arias-Castellanos (2004a), en Rhamdia sebae, reportaron un diámetro promedio de 930 µm para los óvulos. El diámetro de los óvulos es probable que esté relacionado con el modo de fertilización de cada especie, siendo que las especies que presentan fertilización externa, por lo general producen óvulos de menor tamaño que aquellas que poseen fertilización interna (Sánchez et al, 1999). El diámetro de los óvulos también influye sobre el período de incubación, siendo que óvulos de mayor tamaño tienen un tiempo de incubación más largo que óvulos pequeños (Sargent et al, 1987).…”
Section: Discussionunclassified