Embryogenesis and early larval development of the fish Pimelodus grosskopfii (Siluriformes: Pimelodidae)
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| 著者: | , , , , , |
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| フォーマット: | artículo original |
| 状態: | Versión publicada |
| 出版日付: | 2026 |
| その他の書誌記述: | Introduction: Despite its ecological importance, a detailed characterization of the embryonic and early larval development is lacking for the neotropical siluriform Pimelodus grosskopfii. Objective: To describe the ontogenetic and larval development of P. grosskopfii. Methods: Key ontogenetic events were documented from fertilization through 20 days post-hatching using optical microscopy, histology, and scanning electron microscopy at 28.4 °C. Results: Embryonic development proceeded through six distinct stages (zygote, cleavage, blastula, gastrula, segmentation, and organogenesis) and was completed in 11.6 hours, notably faster than other neotropical siluriforms. Newly hatched larvae (4.6 ± 0.5 mm total length) develop from telolecithal eggs with meroblastic cleavage restricted to the animal pole. Histological analyses revealed accelerated organogenesis with barbel rudiments appearing by 13 hours post-hatching and specialized sensory corpuscles by 17.5 hours. The transition to endogenous feeding occurred at 17.5 hours post-hatching, with complete yolk sac absorption by 31 hours. By day nine, larvae developed multiple dental rows (30-40 teeth per row), and by day 14, histological sections revealed complete mandibular ossification and advanced development of olfactory rosettes, gill structures, and the digestive tract. Conclusion: This chronological sequence of morphological and histological changes provides a developmental framework for comparative studies among catfishes and contributes to understanding evolutionary patterns in teleost ontogeny. |
| 国: | Portal de Revistas UCR |
| 機関: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| 言語: | Inglés |
| OAI Identifier: | oai:portal.revistas.ucr.ac.cr:article/2009 |
| オンライン･アクセス: | https://revistas.ucr.ac.cr/index.php/rrbt/article/view/2009 |
| キーワード: | catfish; histology; ontogeny; larvae; embryonic development bagre; histología; ontogenia; larvas; desarrollo embrionario |