A method for the high yield, agricultural production of Enteromorpha clathrata involving repeated steps of supplying brackish or seawater to a pond containing Enteromorpha clathrata. The method involves the steps of (a) supplying a first volume of water, the water selected from the group consisting of brackish and seawater supplemented with at least one fertilizer, wherein the water is conducive to growing Enteromorpha clathrata, to a first predetermined depth in a pond; (b) introducing Enteromorpha clathrata into the conducive water; (c) growing the Enteromorpha clathrata for a predetermined time, wherein the conducive water becomes less conducive to growing Enteromorpha clathrata; (d) withdrawing at least partially the less conducive water after the time, (e) refilling the pond with a second volume of water, the second volume of water selected from the group consisting of brackish and seawater supplemented with at least one fertilizer, wherein said water is conducive to growing Enteromorpha clathrata, to a second predetermined depth; and (f) repeating steps c, d and e wherein the Enteromorpha clathrata grows into a layer of filaments, a portion of the filaments extending above the surface of the water and being exposed to the air. Also disclosed is an isolated Enteromorpha clathrata comprising a haploid progeny of the diploid Enteromorpha clathrata cv. "Berkeley". Further, the haploid progeny include ZS1, ZS2, ZS3, ZS4, ZS5, on and up to ZS15.
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