Development of the neotropical catfish Rhamdia quelen (Siluriformes, Heptapteridae) incubated in different temperature regimes.
The developmental stages for the embryonic and larval periods of the silver catfish (Rhamdia quelen) kept at different temperatures (21, 24, 27 and 30 degrees C) are described. Fish were analysed under light and scanning electron microscopy. For embryonic development, we described 25 stages, which were grouped into seven periods named zygote, cleavage, blastula, gastrula, segmentation, pharyngula and hatching periods. For larval development, we defined three stages (early, mid, and late larvae). Additionally, the main ontogenetic events during the post-larvae and early juvenile periods were also described. This species presents a well developed lateral line and chemosensory systems that grow up during the larval period, maturing in the post-larvae. All tested temperatures are viable to R. quelen development, but a shorter incubation period was necessary to complete the development at lower temperatures. However, some malformations (heart edema) were verified at 30 degrees C.
Universidade Federal do Paraná, Departamento de Biologia Celular, CEP 81531-990, Curitiba-PR, Brazil.
Alana Marielle
AM
Rodrigues-Galdino
Camila Valente
CV
Maiolino
Mariana
M
Forgati
Lucélia
L
Donatti
Jorge Daniel
JD
Mikos
Paulo César Falanghe
PC
Carneiro
Flavia Sant'Anna
FS
Rios
D000818:Animals; D036703:Blastula / Q000378:metabolism / Q000648:ultrastructure; D002397:Catfishes / Q000196:embryology*; D005260:Female; D005399:Fishes / Q000196:embryology; D008297:Male; D038081:Organogenesis; D013696:Temperature; D015053:Zygote / Q000378:metabolism / Q000648:ultrastructure