Abstract
The effects of tertiary sulfonium compounds such as dimethyl-β-propiothetin (DMPT), dimethylacetothetin (DMT), and vitamin U and quaternary ammonium compounds such as glycine betaine and choline on the growth and molt of striped prawn were examined. The results indicated that 0.1mM solution of DMPT most highly stimulates the growth and molt of prawns among various concentrations of DMPT. Though to a lesser extent, DMT solution at 0.1mM also ac-celerated the growth and molt of prawns. However, 0.1mM solutions of vitamin U, glycine betaine, and choline, especially the latter two remarkably inhibited the growth and molt of prawns. Survival rates of prawns in the DMPT, DMT, vitamin U, and control solutions showed similar tendencies of gradual decrease, whereas the glycine betaine and choline solutions brought about rapid death of prawns at the later stages.
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