Comparative survival and growth of turtle grass (Thalassia testudinum König) and shoal grass (Diplanthera wrightii Ascherson) transplanted in aquariums and through-flow sea-water tanks were observed. In aquariums, turtle grass survived 7 months and shoal grass 3½
months. In tanks, turtle grass lived through an experimental period of 12 months and produced new leaves, roots, and rhizomes, but only a few shoal grass plants survived.
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