Transition from endogenous to exogenous nutritional sources in larval Black Sea turbot Psetta maxima
M. Moteki, K. Yoseda, T. Sahin, C. Ustundag, H.
Kohno-2001
Fisheries Science, 67(4): 571-578
(from Current Contents)
Abstract:
Early growth, yolk and oil globule absorption, early
morphological development and initial feeding were studied in the Black Sea
turbot Psetta maxima. Based on energy transition and morphological
development, the nutritional transition process from enclogenous to
exogenous sources was divided into six phases: (i) primordial phase (from
hatching to approximate 30 h after hatching, HAH); (ii) organogenesis phase
(to approximate 90 HAH); (iii) onset of feeding (to approximate 110 HAH);
(iv) early feeding (to approximate 190 HAH); (v) intensified feeding (to
approximate 230 HAH); and (vi) completion of oil globule absorption (to
beyond 345 HAH). Based on comparisons with early life stage features of
other marine species, the turbot larvae were shown to possess the following
characteristics: (i) oil globule remaining for a long period, resulting in
an extended mixed feeding period; and (ii) feeding rate extremely high in
larvae immediately following final absorption of the oil globule. These
features in early turbot larvae were regarded as advantageous for survival
in a rearing condition, although the coincidence of initial feeding with
completion of yolk absorption signalled a period of levelled-off growth
rate.
(Tokyo Univ Fisheries, Lab Ichthyol, Tokyo 1088477, Japan, e-mail of H. Kohno: hirokun@tokyo-u-fish.ac.jp)