Interesting new blog by R. Chaim Goldberg of the OU:
For now, just know that on this blog we hope to provide the following:In other words, more than you'll ever want to know about the kosher status of fish. Link to blog
1. Accurate, useful information about the purchasing of kosher fish
2. Articles, published by reputable sources on this subject
3. Answers to kashrus questions about fish and fish issues.