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The Korean Society of Phycology (한국조류학회(藻類))
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Temperature ranges for survival and growth of juvenile Saccharina sculpera (Laminariales, Phaeophyta) and applications for field cultivation

  • Kim, Soo Hong (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science) ;
  • Kim, Young Dae (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science) ;
  • Hwang, Mi Sook (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science) ;
  • Hwang, Eun Kyoung (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science) ;
  • Yoo, Hyun Il (Fisheries Seed and Breeding Research Institute, National Institute of Fisheries Science)
  • Received : 2021.07.07
  • Accepted : 2021.11.21
  • Published : 2021.12.15
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Abstract

Saccharina sculpera is highly valued for human consumption and value-added products. However, natural resources of this kelp have decreased sharply and it is in danger of extinction. Resources recovery through cultivation is being trialed to enable the sustainable use of this species. In this study, the temperature range for survival and optimal growth of juvenile S. sculpera was identified and applied to field cultivation. This study investigated the survival and growth of juvenile S. sculpera under six temperatures (i.e., 5, 10, 15, 16, 18, and 20℃) and two light intensities (i.e., 20 and 40 µmol photons m-2 s-1) in an indoor culture experiment. In these experiments, the blade length decreased at 16℃ under the both light intensities. The thalli died at 20℃ and 20 µmol photons m-2 s-1, and at 18-20℃ and 40 µmol photons m-2 s-1. During the field cultivation, early growth of S. sculpera was highest at the 5 m depth and growth decreased as the water depth increased. When the initial rearing depth was maintained without adjustment throughout the cultivation period (from December to October), all the cultivated S. sculpera plants died during August and September. However, S. sculpera plants lowered from 5 to 15 m and grew to 90.8 ± 13.1 cm in July. The seawater temperature at 15 m depth was similar to the upper level of thermal tolerance demonstrated by juvenile S. sculpera in the indoor culture experiments (16℃ or lower). The plants were subsequently lowered to 25 m depth in August, which eventually led to their maturation in October. The present study confirmed that improved growth rates and a delay in biomass loss can be achieved by adjusting the depth at which the seaweeds are grown during the cultivation period. These results will contribute to the establishment of sustainable cultivation systems for S. sculpera.

Keywords

Acknowledgement

The study was funded by the National Institute of Fisheries Science in 2021 (R2021005). The authors would like to thank Dr. Philip Heath (Tisbe Ltd., New Zealand) for reviewing the English.

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