Embryogenesis and early larval development of the fish Sorubim cuspicaudus (Siluriformes: Pimelodidae)
Gorde:
| Egileak: | , , , , , |
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| Formatua: | artículo original |
| Egoera: | Versión publicada |
| Argitaratze data: | 2025 |
| Deskribapena: | Introduction: Sorubim cuspicaudus is a migratory catfish listed as a vulnerable fish. The study of its embryonic and larval development allows the identification of morphological and chronological events necessary to establish adequate management practices. Objective: To describe the main events of the embryonic development and early larval phase of the trans-Andean shovelnose catfish, S. cuspicaudus, under controlled conditions of incubation and larviculture. Methods: Final maturing fish were induced for reproduction with a dose of 10 µg of GnRH/kg of live weight. The embryos were incubated at 28 ± 0.5 °C and were analyzed at early stages (zygote-gastrula) every 5 minutes and late stages (cleavage-hatching) every 15 minutes. Results: Animal pole differentiation occurred at 0.5 hours post-fertilization (HPF), first cleavage at 0.58 HPF, 4, 8, 16, 32, 64 cells at 0.75, 0.92, 1.08, 1.17, 1.33 HPF respectively, blastula 1.5 to 4.37 HPF, gastrula 4.7 at 6.87 HPF, organogenesis 7.37 at 11.37 HPF, pharyngula 11.87 at 13.37 HPF, and hatching at 15.92 HPF. The opening of the mouth happened at 32 hours after hatching (HPH), food consumption at 43 HPH at 26.6 °C, yolk sac depletion 70.5 HPH, barbels at 35.7 HPH, fins at 6 days post hatching (DPH), swim bladder at 10.2 DPH, stomach with glands at 12 DPH, additionally with sensory and locomotion organs. Conclusions: The fingerlings show complete development and escape instinct at 14 DPH. It is suggested that 14 DPH could be the minimum age to carry out restocking programs with this species. |
| Herria: | Portal de Revistas UCR |
| Erakundea: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Hizkuntza: | Inglés |
| OAI Identifier: | oai:portal.revistas.ucr.ac.cr:article/1079 |
| Sarrera elektronikoa: | https://revistas.ucr.ac.cr/index.php/rrbt/article/view/1079 |
| Gako-hitza: | histology; larvae; fingerling; growth; ontogeny; catfish. histología; larvas; alevinos; crecimiento; ontogenia; silúridos. |