Do you think the radiation from the nuclear plants in japan could effect the usa?

Question:

in the sense that it could carry over to alaska where a lot of our fish comes from? Would they have to recall a bunch of tuna from there again?

Answer:

No. The amount of radiation is small to start with and 80% of it is iodine-131 which has a half life of about eight days.

"New results from the marine monitoring stations 30 km off-shore were received for seawater samples taken on 26 March. The levels decreased at most of the locations. For iodine-131 the concentration results for four monitoring stations are between 6 to 18 becquerel per litre, and for caesium-137 between "below limit of detection" and 16 becquerel per litre. The dose rates measured on the sea surface remain relatively low between 0.04 and 0.1 microsievert per hour."

Here is where you find current, factual status information:
http://www.iaea.org/newscenter/news/tsun…

And here is a chart that helps make sense of the numbers:
http://www.xkcd.com/radiation/