AVAILABILITY OF PHOSPHORUS FROM SELECTED INORGANIC PHOSPHATES TO JUVENILE ABALONE, HALIOTIS DISCUS HANNAI INO |
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摘 要: |
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关 键 词: | 磷酸盐 鲍鱼 磷 无机物 钙 |
收稿时间: | 1 November 1991 |
修稿时间: | 15 December 2000 |
Availability of phosphorus from selected inorganic phosphate to juvenile abalone,Haliotis discus hannai ino. |
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Authors: | Tan Bei-ping Mai Kang-sen Xu Wei |
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Institution: | (1) Aquaculture Research Laboratory, College of Fisheries, Ocean University of Qingdao, 266003 Qingdao, China |
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Abstract: | The availability of phosphorus to juvenile abalone,Haliotis discus hannai from primary, secondary and tertiary calcium phosphate, primary sodium or potassium phosphate separately or in combination
was determined in a 120-day feeding trial. Seven semi-purified diets were formulated to contain relatively constant dietary
phosphorus, ranging from 0.78%–0.82%. The concentrations of dietary phosphorus were presumed to be slightly below the requirement
for abalone. A brown alga,Laminaria japonica, was used as a control diet. Abalone juveniles of silimar size (average weight 1.18 g; average shell length 18.74 mm) were
distributed in a single-pass, flow-through system using a completely randomized design with eight treatments and three replicates
each treatment. The survival ranged from 71.1% to 81.1%, and was not significantly (P>0.05) related to dietary treatment.
However, the weight gain rate (41.72%–65.02%), daily increment in shell length (36.87–55.07 μm) and muscle RNA-DNA ratio (3.44–4.69)
were significantly (P<0.05) affected by dietary treatment. Soft body alkaline phosphatase activity (10.9–19.8 U/g wet tissue)
and carcass levels of lipid (7.71%–9.33%) and protein (46.68%–49.35%) were significantly (P<0.05) responsive to available
phosphorus of the diets. Dietary treatment had significant effect (P<0.05) on concentrations of phosphorus in the whole body
(WB) and soft body (SB). Apparent digestibility coefficients (45%–97%) of phosphorus were also significantly (P<0.05) different
between dietary treatments. The results indicated that among these inorganic compounds, primary calcium, potassium and sodium
phosphates separately or in combination could be utilized effectively by juvenile abalone as dietary phosphorus sources (availability
ranging from 87%–97%). However, secondary and tertiary calcium phosphates were found to be low in availability, the values
being 45% and 77%, repectively.
Project 39670572 supported by the Natural Science Foundation of China (NSFC). |
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Keywords: | Haliotis discus hannai phosphorus availability feeding and nutrition molluscs |
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