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The sporogenic tissue, motile zoospores and non-motile embryospores of  Laminaria saccharina  were exposed to the different levels of the ultraviolet-B radiation (UV-B) (0.1–1.2 W m −2 ) over 12–24 h. At an irradiance of 1.2 W m −2  spore release began after 4 h exposure of the sporogenic tissue to UV-B. There were also many non-motile spores and the fragments of damaged sporangia found in the media. The motile zoospores ceased their movement after their treatment with UV-B of 1.2 W m −2  for 8210 h, although they retained their viability. The embryospores did not survive after 24 h exposure at an irradiance of higher than 0.6 W m −2 . Tolerance to UV-B attenuated in the following sequence: spores within the sporogenic tissue—motile zoospores—embryospores. Our results strongly suggest that UV-B effectively controls spore release, germination and further development of the early ontogenic stages of  Laminaria saccharina.

The Influence of Ultraviolet-B Radiation on Spore Release and Growth of the Kelp Laminaria saccharina