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Aquac Nutr
2023 Jan 01;2023:2266191. doi: 10.1155/2023/2266191.
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Influence of Dietary Phosphorus on the Growth, Feed Utilization, Proximate Composition, Intestinal Enzymes, and Oxidation Resistance of Sea Cucumber Apostichopus japonicus.
Song Z
,
Li P
,
Hu S
,
Liu C
,
Hao T
,
Han X
.
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Six experimental diets (crude protein 12.58%, crude fat 1.93%, and total energy 10.72 kJ/kg) containing 0.24%, 0.37%, 0.51%, 0.62%, 0.77%, and 0.89% phosphorus were formulated to evaluate dietary phosphorus requirement for sea cucumber Apostichopus japonicus. The feeding trial was conducted in 18 fiberglass tanks (220 L) for 63 days. Each diet was randomly assigned to triplicate tanks of 50 sea cucumbers (9.99 g) and fed once daily. With the increase of dietary phosphorus level, weight gain (WG), specific growth rate (SGR), daily feed intake (DFI), feces production ratio, the activities of amylase, alkaline phosphatase, phosphofructokinase, succinate dehydrogenase, and glutathione peroxidase as well as the contents of glutathione and glutathione oxidized significantly increased and then decreased afterwards (P < 0.05). A. japonicus fed diet with 0.63%, 0.63%, and 0.55% dietary phosphorus was estimated to yield the highest WG (11.39 g), SGR (1.09%/d), and DFI (2.55%/d) according to the quadratic regression analysis of WG, SGR, and DFI against dietary phosphorus level, respectively. The apparent digestibility of dry material and energy followed an opposite tendency. Feed efficiency, the contents of whole-body phosphorus, initially increased and then plateaued, fitting piecewise-linear models with breakpoint at 0.57% and 0.55% dietary phosphorus. Daily phosphorus intake, pyruvate kinase activity, and the ratio of glutathione and glutathione oxidized increased (P < 0.05) but the apparent digestibility of phosphorus, the activities of alkaline protease, aspartate transaminase, and phosphoenolpyruvate carboxykinase decreased (P < 0.05), responding to the increasing dietary phosphorus. Considering the present results, the optimal dietary phosphorus for A. japonicus is 0.57-0.63%.
Figure 1. Quadratic regression analyses of weight gain and specific growth rate (y-axis) in sea cucumber fed diets with graded phosphorus levels (x-axis) (n = 3). The predicted dietary phosphorus level is 0.63% for maximum growth.
Figure 2. The quadratic regression analysis of daily feed intake and piecewise regression analyses of feed efficiency and apparent digestibility of phosphorus (y-axis) in sea cucumber fed diets with graded phosphorus levels (x-axis) (n = 3), respectively. The predicted dietary phosphorus levels are 0.55% for the maximum feed intake, 0.57% for the optimal feed efficiency, and 0.66% for optimal phosphorus digestibility.
Figure 3. A piecewise regression analysis of whole-body phosphorus content (y-axis) in sea cucumber fed diets with graded phosphorus levels (x-axis) (n = 3). The predicted dietary phosphorus level is 0.55% for the optimal whole-body phosphorus deposition.
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