C. Fernandez-diaz et al., Growth and physiological changes during metamorphosis of Senegal sole reared in the laboratory, J FISH BIOL, 58(4), 2001, pp. 1086-1097
The metamorphosis elf Solea senegalensis was studied in larvae reared at 20
degreesC and fed four different feeding regimes. A, Artemia (4 nauplii ml(
-1)): B, Artemia (2 nauplii ml(-1)): C, mixed diet (2 nauplii ml(-1) and 3
mg ml(-1) microencapsulated diet); and D, microencapsulated diet (3.7 mg ml
(-1)). Rotifiers were also supplied in all cases during the first days of f
eeding. These feeding regimes supported different growth rates during the p
re-metamorphosis period (regime A, G = 0.376 day(-1), regime B, G = 0.253 d
ay(-1), regime C, G = 0.254 day(-1): regime D, G = 0.162 day ). Larvae star
ted metamorphosis 9 days after hatching (DAH) when fed the regime A. 13 DAH
with regime B. 11 DAH with regime C and 15 DAH with regime D. A minimum 5.
6-5.9 mm L, was required under all feeding regimes to initiate the metamorp
hosis. Lye translocation was completed when the larvae reached 8.6-8.7 mm L
, (regimes A, B and C). but only 7.3 mm L, with regime D. 4.4-6.2 days were
required to complete eye migration under the regimes 4, B and C. and 183 d
ays under the regime D. This transformation is concomitant with changes in
body reserves, and with the pattern of some digestive enzymes. (C) 2001 The
Fisheries Society of the British Isles.