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Abstract

A 6-week feeding trial was conducted to evaluate the efficiency of hijiki (Sargassum fusiforme) and ecklonia (Ecklonia cava) as dietary supplements for juvenile olive flounder. Fish growth performance, hematology, innate immunity and disease resistance were examined. A basal experimental diet was used as a control and supplemented with 6% of either S. fusiforme or E. cava and another diet was prepared to contain 0.5% oxytetracycline (designated as Con, Hij-6, Eck-6 and OTC-0.5, respectively). The experiment was conducted in triplicate (25 fish per replicate) and the fish (initial body weight, 18.3±0.04 g) were fed one of the test diets at a rate of 3% body weight twice daily. Significantly higher (P<0.05) antioxidant capacity and polyphenolic compounds concentration were detected in hijiki and ecklonia supplemented diets. At the end of the feeding trial, fish growth performance and feed utilization were not significantly affected by dietary treatments. Significantly higher (P<0.05) hemoglobin level and respiratory burst activity were found in fish fed Hij-6 diet. The fish fed Hij-6 and Eck-6 diets exhibited higher resistance against Edwardsiella tarda challenge compared to those fed Con and OTC-0.5 diets. The findings in this study may show that hijiki and ecklonia can be used as environment friendly substitutes for antibiotics in diets for olive flounder.

Dietary inclusion effect of various sources of phyto‐additives on growth, feed utilization, body composition, and plasma chemistry of olive flounder (Paralichthys olivaceus), and challenge test against Edwardsiella tarda compared to a commercial probiotic (super lacto®)

“…Throughout the 6-and 8-day post-observation periods after E. tarda infection after the 4-and 8-week feeding trials, superior survival was achieved in olive flounder fed the GGP diet compared to the SUP, BBP and Con diets, and the SUP and Con diets, respectively. This might demonstrate that inclusion of phyto-additives, especially GG, in the olive flounder diet could enhance disease resistance against E. tarda, even higher than a commercial probiotic Ecklonia cava powder in diets achieved no difference in growth and feed utilization of olive flounder but exhibited greater disease resistance against E. tarda in comparison with either a diet with no additive or a diet with 0.5% oxytetracycline (Kim et al, 2014).…”

Stock enhancement by hatchery-released turbot, <em>Psetta maxima</em>, in the southeastern Black Sea: capture, migration, growth and diet analyses

“…During the tagging, sick and disabled individuals were discarded. Marked fishes were treated with oxytetracycline at 100 ppm for 30 minutes against potential infections (Kim et al 2014). All turbots were tagged at least two weeks before release, and then kept and closely observed in the fibre tank until the time of release.…”