The
supply of amino acids during early feeding stages of marine fish larvae: a
review of recent findings
I. Rønnestad, S.K. Tonheim, H.J. Fyhn, C.R.
Rojas-García, Y. Kamisaka, W. Koven, R.N. Finn, B.F. Terjesen, Y. Barr,
L.E.C. Conceição
Aquaculture, 227(1-4): 147-164
Abstract:
In marine fish larvae, the sum of protein deposition,
turnover and catabolism necessary for their rapid growth dictates a high
amino acid (AA) requirement. Once the yolk is exhausted, the digestive tract
becomes the vital organ that ensures a steady supply of dietary AA to the
growing larval tissues. In this paper, we discuss the demand and
availability of AA (free and polymerised pools) in relation to larval
digestive capacity. The sources of AA from compound and live diets are
described, and the early regulatory roles of cholecystokinin (CCK) and a
retrograde peristaltic activity are highlighted.
(Department of Zoology, University of Bergen, Allégaten
41, N5007, Bergen, Norway, e-mail: ivar.ronnestad@zoo.uib.no)