I hate to say it but as you've probably already noticed, the vendors are offline and no fish are being delivered. You'll get a notice that your rod can't connect. I advise you to stop fishing until we're able to resolve that... Most of our developer team is at work, so I'm not sure how long it will take.
You can watch group notices or this thread for news.
EDIT: We've "unclogged" the servers. They're currently delivering 5+ hours of backlogged fish and purchase requests, so if you caught/bought something, please wait an hour to see if it arrives -- if it still doesn't, then contact 7Seas Sass with an IM requesting a replacement delivery.
Normal fish deliveries will also be delayed until the backlog clears, so we recommend holding off on fishing for awhile! Thanks for your patience.