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The growth and survival of post-larval abalone Haliotis iris (mean initial shell length 570 μm) fed on eight strains (seven species) of benthic diatom were examined in the laboratory. Post-larvae showed active feeding behaviour on all diatom strains. Two strains (Achnanthes longipes-1 and Nitzschia sp.) produced significantly faster growth (means 34-35 μm shell length per day) than the remaining six...