Senegalese farmed sole fry. (Photo: StockFile)
Ideal photo-thermal conditions determined for sole development
Thursday, June 14, 2012, 00:50 (GMT + 9)
The Nutrition Research Group at the University of Murcia (UM) found that the early development of Senegalese sole (Solea senegalensis) larvae is affected by temperature and lighting conditions.
According to a study by scientists at the UM, which was published in the journal Aquaculture, natural temperature and blue wavelength light cycles are ideal conditions for farming this fish.
In addition, Senegalese sole yields substantially improve in comparison to other photo-thermal regimes.
In the natural environment, the daily temperature and light cycles are the main synchronization factors for fish growth while under artificial farming conditions, environmental conditions are set by farmers to try to ensure the survival and growth of fish, the UM points out in a statement.
The studies indicate that different light thermo-cycles and spectra affect the early development of larvae of the species.
| Larvae under different thermo-cycles. (Photo: UM)
The newly hatched larvae were subjected to different temperature cycles and different photoperiods and light spectra, and there was a higher survival and yield, apart from the incidence of malformations in the lower jaw.
For researchers, remote lighting conditions from the aquatic environment and "unnatural" temperatures seriously endanger the welfare of sole larvae and negatively impact their development.
The results determine that the ideal farming conditions would be in 22.1 °C--19 ºC ranges with light of 435-500 nm, approximately, following the day and night cycles.
Borja Blanco-Vives, Natalia Villamizar, Jesús Ramos, María José Bayarri, Olvido Chereguini and Francisco Javier Sánchez-Vázquez, from the UM, participated in the study.
By Analia Murias