Effect of choline chloride as an osmoregulator as well as its role in growth and the biochemical content of postlarval kuruma shrimp; Marsupenaeus japonicus (Bate) |
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| Authors: | FR Michael S Koshio |
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| Affiliation: | 1. Fish Nutrition Lab., Aquaculture Division, NIOF, Alexandria, Egypt;2. Aquatic Animal Nutrition Lab., Kagoshima University, Kagoshima, Japan |
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| Abstract: | A 45‐day feeding experiment was conducted to examine two levels of dietary choline chloride (CC) 0.6 and 1.2 g kg?1 CC] against control (0.0 g kg?1 CC) on the biological, biochemical composition and stress tolerance of postlarval (PL‐20) Marsupenaeus japonicus. The results showed improvements in some biochemical contents such as phosphatidylcholine (PC) and methionine (Met) as 0.6 and 1.2 g kg?1 dietary CC significantly (P < 0.05) increased both PC and Met contents of shrimp carcass more than those of the control group. The results also showed that supplemental (0.6 g kg?1) choline could improve (P < 0.05) PC/PE (phosphatidylethanolamine) ratio. Growth parameters of the shrimp group that received 0.6/1.2 g kg?1 dietary CC showed a significant (P < 0.05) improvement. In case of osmotic stress test, 0.6 g kg?1 supplemented CC level showed significantly (P < 0.05) longer LT‐50 (the lethal time needed to kill half of the population) than the other shrimp groups that received 0.0 and 1.2 g kg?1 dietary CC levels. This study showed the efficacy of 0.6 g kg?1 dietary choline to improve the osmotic tolerance of kuruma shrimp as well as growth, survival and biochemical contents of postlarval kuruma shrimp. |
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| Keywords: | choline chloride metabolism nutrition shrimp stress tolerance |
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