对 198 7～ 1994年回归到大洋河中的部分成鱼进行了取样测定分析 ,主要形态特征为 :大麻哈鱼测线鳞 12 7～ 150枚 ,鳃耙数 17～ 2 6枚 ,幽门垂 164～ 171枚 ;马苏大麻哈鱼侧线鳞 13 2～ 13 7枚 ,鳃耙数 17～ 2 1枚。溯河年龄 :马苏大麻哈鱼为单一的 3年鱼 ;大麻哈鱼 2～ 4年鱼 ,以 3年鱼为主。平均体重 :大麻哈鱼2 763g ,马苏大麻哈鱼 1911g溯河期为 :大麻哈鱼 7～ 11月、马苏大麻哈鱼 4～ 5月 The sampling and analysis of some adult fish returned to the Ocean River from1998 to 1994 were carried out. The main morphological characteristics were: 12 to 150 pieces of lineage of salmon, 16 to 26 pieces of gill rake, 164 to 171 pieces of pylorus Pieces; Masu salmon sideline scales 13 2 ~ 13 7, gill rake number 17 ~ 21 pieces. Ahead of the river age: Ma Su salmon for a single 3-year fish; salmon 2 to 4 years of fish, mainly to 3-year-old fish. Average body weight: 2 763g salmon, mahu salmon 1911g Anadromous period: salmon from July to November, Mayu salons 4 May