Tolerance response to water pH in larvae
of two marine fish species, gilthead seabream, Sparus aurata (L.) and
Senegal sole, Solea senegalensis (Kaup), during development
G.
Parra, M. Yúfera-2002
Aquaculture
Research, 33(10):
747-752
Abstract:
Gilthead seabream, Sparus aurata (L.) and Senegal sole, Solea
senegalensis (Kaup) are two fish of primary importance in Mediterranean
aquaculture. In the present study, the larvae of these species were exposed
to different rearing-water pH during 24 h to examine their tolerance. The
24-h pHL50 values were calculated with low and high pH values at 7, 20 and
32 days after hatching (DAH) in S. senegalensis larvae, and 12, 20
and 52 DAH in S. aurata larvae. Low 24-h pHL50 values ranged between
4.88 and 5.76, whereas high 24-h pHL50 values ranged between 8.94 and 9.57
in S. senegalensis larvae. S. aurata larvae showed values of
low 24-h pHL50 that ranged between 4.82 and 5.55, whereas values of high
24-h pHL50 ranged between 8.66 and 9.26. Both species showed similar
tolerance response at all the tested ages. The high 24-h pHL50 values found
were close to pH values that eventually can be reached in the rearing tanks.
The pH should be carefully controlled in rearing water during the first
development stages of both species.
(Dpto.
Biología Animal, Vegetal y Ecología, Universidad de Jaén, E-23071 Jaén,
Spain. E-mail: gparra@ujaen.es)