I'm a little bit late in my linking, but the Carnival of the Blue is up for May! Huzzah! I've enjoyed following and occasionally contributing to this monthly compilation of ocean blogging. Sad to say, next month will probably be its last. In the words of carnival curator Jason Robertshaw, 
Next month will be the last edition of the Carnival of the Blue that I will be curating. The consensus among those I've polled is that the utility of blog carnivals has diminished in the last couple of years, especially with the rise in social media. Consequently, June may also be the last Carnival of the Blue. There is the possibility of transferring the curation of the carnival onto someone else. If you know anyone who is interested in the responsibility, please have them contact me.