Yolk Absorption Rate and Mouth Development in Larvae of Dormitator latifrons (Perciformes: Eleotridae)
Fish larvae suffer high starvation mortality during the transition from yolk absorption to exogenous feeding, and the size of the developing buccal structures limits the food they can consume. Determining the suitable timing and size of live or inert foods could decrease this mortality. We described...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Institut de Recerca i Tecnologia Agroalimentàries (IRTA) |
| Repositorio: | IRTA Pubpro. Open Digital Archive |
| OAI Identifier: | oai:repositori.irta.cat:20.500.12327/2039 |
| Acceso en línea: | http://hdl.handle.net/20.500.12327/2039 https://doi.org/10.3390/fishes7060375 |
| Access Level: | acceso abierto |
| Palabra clave: | 637 |
| Sumario: | Fish larvae suffer high starvation mortality during the transition from yolk absorption to exogenous feeding, and the size of the developing buccal structures limits the food they can consume. Determining the suitable timing and size of live or inert foods could decrease this mortality. We described mouth development and determined the yolk absorption rate and point-of-no-return (PNR) of Dormitator latifrons larvae. One male and one female specimen were induced to spawn using salmon GnRHa implants, and 45 of their larvae were sedated and observed under a microscope every 24 h to measure total length, standard length, yolk sac length, yolk sac width, oil globule length, oil globule width, width of the oesophagus, and length of the upper and lower jaw longitudinal. The growth model, maximum mouth opening, daily survival, and starvation period were determined. The larval growth was fastest during the first 24 h post−hatching (HPH) at 28 ± 1 °C with an average increase of 625.42 µm in total length and 573.51 µm in standard length. The highest percentage of yolk absorption (52%) occurred within 24 HPH and at 96 HPH the yolk sac was completely reabsorbed. The PNR was reached at 156.41 HPH (p < 0.05). At 96 HPH, the upper and lower jaw were distinguishable by mouth movements. Our results suggest that the larvae of D. latifrons should be fed at 96 HPH with prey measuring 50–65 µm. |
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