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Gut contents of silver carp, Hypophthalmichthys molitrix, and the disruption of a centric diatom, Cyclotella, on passage through the esophagus and intestine
Xie, P; Xie, P, Chinese Acad Sci, CERN, Donghu Expt Stn Lake Ecosyst, Inst Hydrobiol, Wuhan 430072, Peoples R China
1999
Source PublicationAQUACULTURE
Volume180Issue:3-4Pages:295-305
AbstractThe digestibility of algae by stomachless filter-feeding fish has been debated for decades. Results from gut contents and digestive enzyme analysis suggest poor utilization, while the measurement of food assimilation using radiolabeled isotope techniques indicate reasonable assimilation efficiency. Phytoplankton in the gut contents of the planktivorous filter-feeding silver carp were studied during March-May. The fish were cultured in a large net cage in a shallow, hypertrophic subtropical Chinese lake, Lake Donghu. In terms of biomass, the dominant phytoplankton in the fore-gut contents were Cyclotella (average 77.8%, range 69.7-93.5%) and Cryptomonas (average 9.57%, range 0-20.4%). The Ivlev's electivity index E of silver carp was much higher for Cyclotella (1.54) than for Cryptomonas (0.56). The majority of the phytoplankton found in the intestines of silver carp were 8-20 mu m, but they were also able to collect particles as small as 4.5-10 mu m, smaller than their filtering net meshes, suggesting that the secretion of mucus may play an important role in collecting such small particles. We conclude that disruption of cell walls is principally by the pharyngeal teeth, explaining previous contradictory conclusions. (C) 1999 Elsevier Science B.V. All rights reserved.
KeywordStomachless Filter-feeding Fish Breakdown Of Algal Cells Ingested Algae Silver Carp (Hypophthalmichthys Molitrix)
DepartmentChinese Acad Sci, CERN, Donghu Expt Stn Lake Ecosyst, Inst Hydrobiol, Wuhan 430072, Peoples R China
Subject AreaFisheries ; Marine & Freshwater Biology
Indexed BySCI
WOS IDWOS:000082894300008
Citation statistics
Cited Times:55[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/10174
Collection期刊论文
Corresponding AuthorXie, P, Chinese Acad Sci, CERN, Donghu Expt Stn Lake Ecosyst, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Xie, P,Xie, P, Chinese Acad Sci, CERN, Donghu Expt Stn Lake Ecosyst, Inst Hydrobiol, Wuhan 430072, Peoples R China. Gut contents of silver carp, Hypophthalmichthys molitrix, and the disruption of a centric diatom, Cyclotella, on passage through the esophagus and intestine[J]. AQUACULTURE,1999,180(3-4):295-305.
APA Xie, P,&Xie, P, Chinese Acad Sci, CERN, Donghu Expt Stn Lake Ecosyst, Inst Hydrobiol, Wuhan 430072, Peoples R China.(1999).Gut contents of silver carp, Hypophthalmichthys molitrix, and the disruption of a centric diatom, Cyclotella, on passage through the esophagus and intestine.AQUACULTURE,180(3-4),295-305.
MLA Xie, P,et al."Gut contents of silver carp, Hypophthalmichthys molitrix, and the disruption of a centric diatom, Cyclotella, on passage through the esophagus and intestine".AQUACULTURE 180.3-4(1999):295-305.
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