Biologists speculate that the mostly likely cause was a shift in Pacific Ocean currents, but food availability, changing river conditions and predator-prey relationships could be affecting the fish.
生物学家推测，最有可能的成因是太平洋洋流的变化，不过食物的取得、河流环境的改变、生物掠夺关系等，也都可能对鲑鱼造成影响。
UP A shallow river, five kilometres from the Pacific coast in Japan’s north-eastern Iwate prefecture, lie the remains of a town.
在日本东北部的岩手县，太平洋沿岸五公里处一条小河的上游保留着一座小城的遗址。
UP A shallow river, five kilometres from the Pacific coast in Japan's north-eastern Iwate prefecture, lie the remains of a town.
在日本东北部的岩手县，太平洋沿岸五公里处一条小河的上游保留着一座小城的遗址。
As a result, the waters of the Snake River flow to the Pacific Ocean, while those of the Yellowstone find their way to the Atlantic Ocean via the Gulf of Mexico.
因此，蛇河的水流向太平洋，而黄石河的水则通过墨西哥湾流向大西洋。
During the Gold Rush he steered his steamships single-handedly through Nicaraguan river rapids to find a way to get his passengers more quickly and cheaply to the Pacific Ocean.
“淘金热”期间，他还单枪匹马指挥蒸汽机船队遍走尼加拉瓜河路，迅速找到了一条能使乘客更快更便宜的前往太平洋的航线。
He was finally picked up by police after being spotted loitering at a university in the Volga river city of Samara, over 8,000 km from his native Primorye region, on Russia's Pacific coast.
当他后来在位于伏尔加河河畔的萨马拉市的一所大学内停留时终于被警方觅得了行踪，并马上将其逮捕。 这名男子原本住在俄罗斯太平洋沿岸的Primorye地区，而萨马拉市与该地的距离则已经超过了8000公里。
Marine scientists plan to ramp up efforts on Tuesday to coax a couple of wayward whales out of the Sacramento River and back into the Pacific.
海洋科学家计划周二加大努力诱导一对任性的鲸鱼游出萨克拉曼多河回到太平洋。
The expedition had set sail from the Thames river on 19 May 1845, carrying with it the hope of the nation for the discovery of a navigable route through the Arctic into the Pacific Ocean.
探险队于1845年5月19日从秦晤士河起航，带着与举国上下的希望，云发现一条从北极到太平洋的航道。
In 1862, building of a railroad to join the Pacific coast with the Mississippi River valley was begun.
1862年，一条连结太平洋海岸与密西西比河流域的铁路开始修建。
White Swan Pond area has a large number of industrial heritage along the river, such as the Pacific warehouse, spent in warehouses, large blurted depot, Lutheran Hall, etc.
白鹅潭沿江地区有大量工业遗产，如太古仓、花地仓、大冲口油库、信义会馆等。
White Swan Pond area has a large number of industrial heritage along the river, such as the Pacific warehouse, spent in warehouses, large blurted depot, Lutheran Hall, etc.
白鹅潭沿江地区有大量工业遗产，如太古仓、花地仓、大冲口油库、信义会馆等。
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