The study was performed to examine the efficacy of ginger (Zingiber officinale) extract on growth performance, biochemical and hemato-immunological parameters in juvenile beluga (Huso huso). Fish were divided into 4 groups before fed diet for 8 weeks with 0.5%, 1% and 1.5% ginger extract and with unsupplemented commercial diet as the control. Results showed that there was a significant different in weight gain in fish fed ginger extract diet compared to the control (P<0.05). There were no significant differences in condition factor, feed conversion ratios, specific growth rate and survival between juveniles fed control and ginger extract supplementation (P>0.05).
Aquaculture has an important role in global protein supply all over the world, and rainbow trout, Oncorhynchus mykiss, is one of the most important coldwater fish species in aquaculture industry. Rainbow trout global production exceeded 800,000 tons in 2017, which more than 20% of this value has been related to Iran (FAO, 2019). Due to its importance, extended researches have been conducted on nutritional aspects of this species. Nutrition is an important factor in aquaculture, because it directly affects fish growth and health as well as the farm profitability (Abdel-Tawwab, 2016). As a result, finding nutritional methods to augment fish health is worthy. Among different feed additives, dietary herbal additives showed promising health-boosting effects in fish (Abdel-Tawwab, 2016;, 2019. For example, herbal additives may improve haematological parameters in fish, because they are antioxidant and prevent haemolysis
This research was carried out to survey the ffects of dietary of Lentinula edodes mushroom extract as a feed supplement on growth performance and survival rate, immune response, hematological and biochemical characteristics of beluga juvenile (Huso huso). Four hundred and fifty fish after acclimation with average weight of 40.45 ± 5.72 g were fed in a wholly randomized design in 5 treatments (basic diet containing 0% (control), 00.5%, 1%, 1.5% and 2% L. edodes mushroom extract) and 3 replicates. During the experiment (56 days), a total of eight samples were taken in 8 weeks. The mean of data were analyzed using oneway ANOVA and Duncan's post hoc test at 5% level. Results indicated that administration of 2% of mushroom extract for 8 weeks improved weight gain, specific growth rate and feed conversion ratio of beluga (P<0.05).
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