Characterization of the digestive tract of wild ayu     

HEISUKE  NAKAGAWA  TETSUYA  UMINO  TAKASHI  SEKIMOTO  IRFAN  AMBAS  W LINN  MONTGOMERY  TAKETO  NAKANO 《Fisheries Science》2002,68(2):341-346

ABSTRACT: The gut and gut contents of ayu Plecoglossus altivelis caught in the Ohta River in Hiroshima prefecture, Japan were examined. Relative intestine length (intestine length/body length) was almost constant. Except for relative intestine length, characteristics of the gut of wild ayu were not significantly different from those of cultured ayu. The height of intestinal folds increased and their width declined from stomach to anus. Cyanobacteria ( Homoeathrix sp. and Calothrix sp.) and diatoms ( Cymbella sp., Gomphonema sp., Melosira sp., Navicula sp., and Synedra sp.) were well digested during passage through the gut despite a lack of apparent destruction. In contrast, green algae ( Dictyosphearium sp., Coelastrum sp., and Pediastrum sp.) exhibited little degradation. The pH of stomach contents ranged from 2.8 to 7.4 (mean ± SD = 4.1 ± 1.0), whereas that of the posterior intestine was 7.0–8.5 (7.9 ± 0.4). Gut contents of wild ayu increased with bodyweight, and were more than threefold greater than those of cultured ayu, suggesting that wild ayu compensate for low nutrient content of algae through the continuous ingestion of large quantities of feed organisms.  相似文献   

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Kotaro KATO  Hiroshi HIRATA  Hitoshi SEKIMOTO  Yasuhiro ARIMA 《Soil Science and Plant Nutrition》2007,53(1):17-22

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Analysis of NO₃ interception of the parasitic angiosperm Orobanche spp. using a positron-emitting tracer imaging system and ¹³NO₃⁻: A new method for the visualization and quantitative analysis of the NO₃ interception ratio     

Naoki KAWACHI  Shu FUJIMAKI  Koichi SAKAMOTO  Noriko S. ISHIOKA  Simpei MATSUHASHI  Hitoshi SEKIMOTO 《Soil Science and Plant Nutrition》2008,54(3):408-416

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