静岡,神奈川県下に出現したヨ-ロッパウナギのシラスについて

概要

論文の詳細を見る
Seventy-six elvers of the European eel, Anguilla anguilla LINNAEUS, ranging from 61.8 to 80.0mm in total length (mean 71.2mm), were collected in February-April 1977 in the Yui and Fujimori Rivers in Shizuoka Prefecture and in the Hikiji River in Kanagawa Prefecture, Japan. The vertebral column of the specimens showed the vertebrae to be 26-29 predorsal (mean 27.0), 10-14 ano-dorsal (mean 11.8), 38-40 preanal (mean 39.1), 44-46 abdominal(mean 45.0), and 67-72 caudal (mean 69.4). The total vertebral count varied from 112 to 117 (mean 114.5), These specimens, distinguishable from elvers of the Japanese eel, Anguilla japonica TEMMINCK et SCHLEGEL, by their relatively large size and higher count of ano-dorsal vertebrae, showed taxonomic characters identical to those of the European eel, Anguilla anguilla LINNAEUS, after being reared in confinement for 80 and 400 days. The European eel elvers were also collected in January 1973 from the Hikiji River. The occurrence of European eel elvers in Japanese rivers probably resulted from escape from nearby eel-culture ponds that were stocked with this species and not from spawning in Japanese waters.
日本水産學會の論文