Effect of salinity on egg hatching, yolk sac absorption and larval rearing of Senegalese sole (Solea senegalensis Kaup 1858)
Article first published online: 10 JUN 2012
© 2012 Blackwell Publishing Asia Pty Ltd
Reviews in Aquaculture
Volume 4, Issue 2, pages 49–58, June 2012
How to Cite
Salas Leitón, E. A., Rodriguez-Rúa, A., Asensio, E., Infante, C., Manchado, M., Fernández-Díaz, C. and Cañavate, J. P. (2012), Effect of salinity on egg hatching, yolk sac absorption and larval rearing of Senegalese sole (Solea senegalensis Kaup 1858). Reviews in Aquaculture, 4: 49–58. doi: 10.1111/j.1753-5131.2012.01060.x
- Issue published online: 10 JUN 2012
- Article first published online: 10 JUN 2012
- Received 19 October 2011; accepted 23 January 2012.
- egg hatching;
- Solea senegalensis;
- yolk sac larvae
Assays carried out under laboratory-controlled conditions revealed that eggs of Senegalese sole, Solea senegalensis Kaup 1858, incubated at 10, 18, 27 and 33 grams per litre (g L−1) reached their maximum hatching rates (above 80%) 48 h after incubation. In contrast, hatching was significantly delayed (24 h) and completely failed when the salinity was set at 5 and 0 g L−1, respectively. Newly hatched and early-developing yolk sac larvae presented similar survival rates 3 days after hatching (DAH) when exposed to salinities of 10, 18, 27 and 33 g L−1. Larvae incubated at 5 g L−1 salinity died a few hours after hatching once they were released from their respective chorions. The notochord length was unmodified by salinity 5 DAH. Nevertheless, an overall lower myotomal height and a putative delay in the depletion of yolk sac were found in larvae reared at 10 g L−1. This anomaly in overall larval development became more pronounced with the occurrence (100% of analysed larvae) of mouth deformities and a lack of functionality under 10 g L−1 salinity. Transferring 2 DAH larvae from 33 g L−1 (exhibiting normal mouth development) to a medium with a salinity of 10 g L−1 had no effect on first feeding, weight and metamorphic index. Overall our results indicate the existence of a key time window (0–2 DAH) in which a salinity value higher than 10 g L−1 is required to achieve adequate mouth development and further functionality of larvae. The present work represents a valuable contribution to the sole industry, opening new possibilities in hatchery management practices.