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Transport rates of amino acids were deter mined for larvae of different ages of the echiuran worm Urechis caupo, the gastropod Haliotis ruftscens, the bi valve Crassostrea gigas, and the sea urchin Strongylo centrotus purpuratus. All larval forms showed an in crease in the transport rate of amino acids during deveb opment. Trochophores of U. caupo increased their rate of net flux for each of 5 amino acids (100 nM each) by a factor of 1.6 and 2.2 during 1â€"3 days and 4â€"8 days, respectively, for two independent cultures. In H. rufes cens, the maximum transport capacity (Jmax) for alanine increased 3-fold during the 24 h required for the trocho phore to develop into a veliger. In C. gigas veligers, there was a 9-fold increase in the maximum transport capacity for alanine during larval development from an 80 @tm to a 300 sm larva. In sea urchins, the prism-stage larvae (2- day-old) had an alanine transport system with a K@ of 1.9 @tM and a Jmaxof 8. 1 pmol larva'h'. The kinetics of alanine transport in the pluteus-stage (4-day-old) were best described by two systems (System I: K1 = 1.0 zM with a imaxof5.6 pmol larva'h'; System II: K@ = 132.0 @.tM with a Jmaxof 8.4 pmol larva'h'). In larvae of C. gigas, the relationship between the rate ofalanine trans port and body size was described by the equation, bog Jmax (pglarva'h') = 1 .6894(X) + (â€"0.5937), where X is the shell length in @tm. It is illustrated that the albometric increase in respiration rates, during the growth of bivalve

Ontogenic Changes in the Rates of Amino Acid Transport from Seawater by Marine Invertebrate Larvae (Echinodermata, Echiura, Mollusca)