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.
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