Phospholipids in
formulated start-feeds - Effect on turbot (Scophthalmus maximus L.)
larval growth and mitochondrial alteration in enterocytes
R. MacQueen Leifson, J.M. Homme, J.P. Jøstensen,
Ø. Lie, R. Myklebust, T. Strøm-2003
Aquaculture
Nutrition, 9(1): 43-54
Abstract:
Turbot Scophthalmus maximus, larvae
were start-fed with formulated feeds containing marine phospholipids (MP) or
soya phospholipids (SP). The experiment was performed with six experimental
groups, four groups were given formulated feeds, one group was given live
feed and one group was starved. Phospholipid (PL) contents of the formulated
feeds were respectively 5% MP, 15% MP, 5% SP and 15% SP. Larvae were offered
feed from day 3 post-hatch. There was no significant size difference on day
5 between the group fed 15% MP and the group given rotifers. Electron
microscopical examination of enterocytes was performed on larval intestine
on day 5. Larvae fed 5% and 15% MP and larvae fed rotifers had normal
looking enterocytes with numerous normal looking mitochondria. In the
enterocytes of larvae fed 5% SP and 15% SP the mitochondria appeared swollen
with a translucent matrix and fragmented cristae. Thus, MP and not SP seemed
suitable as a lipid and PL source for start-feeding turbot larvae.
(Norwegian College of Fishery Science, Institute of
Marine Biotechnology, University of Tromsø, Breivika, Tromsø)