Effects of Dietary Hizikia fusiformis on Growth and Immune Responses in Juvenile Olive Flounder (Paralichthys olivaceus)

  • Pham, Minh Anh (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee, Kyeong-Jun (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee, Bong-Joo (Faculty of Applied Marine Science, Cheju National University) ;
  • Lim, Se-Jin (Faculty of Applied Marine Science, Cheju National University) ;
  • Kim, Sung-Sam (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee, Young-Don (Marine and Environmental Research Institute, Cheju National University) ;
  • Heo, Moon-Soo (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee, Ki-Wan (Faculty of Applied Marine Science, Cheju National University)
  • Received : 2006.03.15
  • Accepted : 2006.05.30
  • Published : 2005.12.01


An eight week feeding trial was conducted to investigate the effects of dietary supplementation of hizikia (Hizikia fusiformis) on growth performance, immune responses and resistance of juvenile olive flounder (Paralichthys olivaceus) to Streptococcus iniae. Four experimental diets (designated as Hiz 0, Hiz 2, Hiz 4 and Hiz 6) were formulated to be isonitrogenous (50% crude protein) and isocaloric (17.2 MJ/kg DM). Hizikia powder was added at 0%, 2%, 4% and 6% in diets Hiz 0, Hiz 2, Hiz 4 and Hiz 6, respectively. Three replicates of fish groups (15 fish/tank) were fed one of the experimental diets. At the end of feeding trial, no significant differences were observed in final body weight, specific growth rate, protein efficiency ratio, feed utilization and feed intake among fish groups fed the experimental diets. However, there was clear trend that the growth performances of fish were improved by the increment of dietary hizikia showing a positive growth effects. Mean phagocytes activated with nitro-blue-tetrazolium were significantly increased with the increment of dietary hizikia. The cumulative mortality was significantly (p<0.05) lower in the fish groups fed Hiz 6 diet (no mortality) than that in the other fish groups for 15 days of S. iniae challenge test. The findings of this study suggest that a dietary supplementation of hizikia could enhance the nonspecific immune response and improve the resistance of juvenile olive flounder to S. iniae.


Olive Flounder;Hizikia fusiformis;Immune Response;Streptococcus iniae


Supported by : Ministry of Maritime Affairs & Fisheries


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