Compensatory growth of Chinese shrimp, <Emphasis Type="Italic">Fenneropenaeus chinensis</Emphasis> following hypoxic exposure |
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Authors: | Liu-Zhi Wei Xiu-Mei Zhang Jian Li Guo-Qiang Huang |
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Institution: | (1) The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003, People’s Republic of China;(2) Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Qingdao, 266071, People’s Republic of China |
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Abstract: | Compensatory growth following stress is a strategy aquatic animals use to adjust themselves to a variable environment. Studies
on the recovery growth of aquatic animals are not only of theoretical value in ecophysiology and evolution, but also important
to applications in aquaculture and fisheries resource management. In this experiment, juvenile Fenneropenaeus chinensis with an initial average body weight of about 3.72 g were exposed to hypoxic water (about 2.08 and 3.11 mg/l of dissolved
oxygen (DO) content) for 10 days and then switched to normoxic water (about 5.63 and 5.59 mg/l DO). Compared with juveniles
in normoxia, juveniles in the hypoxia period allocated a greater proportion of energy to metabolism and exuviations but allocated
less energy to daily metabolism per gram shrimp weight (J/g/day). This reduced feed conversion efficiency and feeding rate.
Finally, F. chinensis suffered growth depression. The juveniles completely compensated for hypoxia-induced growth depression in 30 days after being
switched into normoxic water and the compensation was achieved mainly by hyperphagia and slightly by improvement of feed conversion
efficiency. During the recovery period the hypoxic-stressed shrimp showed higher daily metabolic energy (J/g/day) than controls
(P < 0.05). Which means the stressed shrimp had more energy for feeding-related activities. So hyperphagia was observed. Energy
analysis indicated that F. chinensis improved feed-conversion efficiency mainly by reducing the percentage of energy lost in feces and exuviations. The results
showed that short-term non-lethal hypoxia would not affect the growth of juvenile F. chinensis if there were enough time for the stressed shrimp to recover. This suggested F. chinensis was capable of adapting to DO fluctuation to some extent and short-term non-lethal hypoxia would not have an obvious effect
on natural, released, and cultured shrimp stock. |
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Keywords: | Compensatory growth Energetics Fenneropenaeus chinensis Hyperphagia Hypoxia |
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