Apostichopus (= Stichopus) japonicus blastulae and gastrulae were acclimated for 18 h to salinities of 32‰ (control), 24 and 22‰ (the lower limit of the range of tolerance), and 20‰ (below the range of tolerance). Acclimation to 20‰ resulted in the appearance of teratic larvae, most of which subsequently died. Acclimation to 24, 22, and 20‰ led to a shift in the range of tolerance of the larvae at further stages of development. With a decrease in salinity, acclimated larvae developed more successfully than unacclimated larvae. Acclimated larvae attained the pentactula stage and settled at a salinity range of 32–20‰; unacclimated larvae, at 32–22‰. At different stages of development, acclimated larvae survived greater decreases in salinity than unacclimated larvae. The acclimation effects could be traced up to metamorphosis and settling, i.e., two weeks after the end of the acclimation process.
Russian Journal of Marine Biology – Springer Journals
Published: Oct 8, 2004
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