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SCI论文目录 |
Gut contents of bighead carp (Aristichthys nobilis) and the
processing and digestion of algal cells in the alimentary canal
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| 出 版 社：Aquaculture [Aquaculture]. |
| 发表时间：2001 |
| 台 站：
东湖湖泊生态系统试验站
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| 作 者： Xie, P* |
| 点 击 率：2351 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)： Bighead carp is one of the most important freshwater
filter-feeding fish of Chinese aquaculture. In recent decades,
there have been a number of contradictory conclusions on the
digestibility of algae by bighead carp based on the results from
gut contents and digestive enzyme analysis or radiolabelled
isotope techniques. Phytoplankton in the gut contents of bighead
carp (cultured in a large net cage in Lake Donghu) were studied
during March-May. In biomass, the dominant phytoplankters in the
fore-gut contents were the centric diatom Cyclotella (average
54.5%, range 33.8-74.3%) and the dinoflagellate Cryptomonas
(average 22.8%, range 6.8-55.8%). Phytoplankton in water samples
were generally present in proportionate amounts in samples from
the fore-guts of bighead carp. The size of most phytoplankton
present in the intestine of bighead carp was between 8 and 20 mu m
in length. Bighead carp was also able to collect particles (as
small as 5-6 mu m) much smaller than their filtering net meshes,
suggesting the importance of mucus in collecting small particles.
Examination of the change in the integrity of Cyclotella on
passage through the esophagus of bighead carp indicated that
disruption of the algal cell walls is principally by the
pharyngeal teeth, explaining the previous contradictory
conclusions.
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