Benchmarking of early ontogeny parameters as predictors of the first-feeding larvae vitality in spotted rose snapper Lutjanus guttatus

A common problem in marine fish hatcheries is the lack of functional embryonic parameters reliably predicting favorable larval outcomes. Embryos characterized as high-quality by typical assessment methods frequently result in weak larvae with high mortality during the endo-exotrophic transition. Thu...

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Veröffentlicht in:Aquaculture reports 2023-06, Vol.30, p.101619, Article 101619
Hauptverfasser: Martínez-Brown, Juan Manuel, Álvarez-González, Francisco, Ibarra-Castro, Leonardo, Abdo-de la Parra, María Isabel, Rodríguez-Ibarra, Luz Estela, Rojo-Cebreros, Angel Humberto, Navarro-Flores, Jaime
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Sprache:eng
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Zusammenfassung:A common problem in marine fish hatcheries is the lack of functional embryonic parameters reliably predicting favorable larval outcomes. Embryos characterized as high-quality by typical assessment methods frequently result in weak larvae with high mortality during the endo-exotrophic transition. Thus, because there is no universal consensus on what parameters are most associated with successful larval survivability, this study aims to determine the most reliable, practical, and real-time predictor of vitality at the earliest developmental stage for first-feeding larvae of L. guttatus. From 18 mass volitional spawnings, the reproductive performance and quality of embryos and larvae were assessed by following quality parameters: total fecundity per spawning, percentage of floating eggs, fertilization rate, blastomere morphology score (at 8–32 cell stages), egg and oil globule volumes, coefficient of variation of eggs and oil globule diameters, percentage of poly-globular eggs, oil globule-to-egg volume percentage, morphological appearance and survival rates at 24 (hatching), 48 and 72 h post-spawning, larvae transition rate, and survival activity index (SAI). SAI was used as a larval vitality benchmark to determine the predictive capacity of the abovementioned parameters. Our results show that blastomere morphology score was the only parameter positively correlated with SAI. However, when examining each component of blastomere morphology to SAI prediction, only the presence of cell inclusions, but not size, symmetry, margins, or adhesions of blastomeres, predict the SAI. This reveals that embryos with defective blastomeres can develop into normal-appearing larvae but are weak to starvation. Therefore, cell inclusions are the best real-time, early, reliable, and functional predictor of first-feeding larvae vitality in L. guttatus. •The survival activity index is used as a parameter of first-feeding larvae vitality in Lutjanus guttatus.•Embryos with defective blastomeres develop into appearance normal larvae but weak to starvation.•Inclusions, but not size, symmetry, margins, or adhesions of blastomeres, predict the first-feeding larvae vitality.•Cell inclusions are an early, reliable, and real-time predictor of embryo quality.•Egg and oil-globule sizes, hatching, survivorship, and normal appearance percentages do not predict the larvae vitality.
ISSN:2352-5134
2352-5134
DOI:10.1016/j.aqrep.2023.101619