フィリピンより初記録のウナギについて

抄録

The authors obtained six specimens of the Japanese eel, Anguilla japonica T. et S. from Cagayan River, near Aparri City, Luzon Island, the Philippines. These specimens were taken as elvers from the river in January and February, 1974, and reared for a period in the Philippines. This is the first record of the Japanese eel from the Philippines and the southernmost locality for the eel. It is likely that the Japanese eel constituted 1-2% of elvers collected in Cagayan Estuary in January and February, 1974. The authors could not find this eel in the samples taken in the other months. A key to the species was given for the Philippine eels.