Joe Sisneros was interviewed by Associated Press about the possibility that the hum might be made by Midshipman fish. This interview spawned several news stories about the fish and the mystery sound. In the end it was determined that the fish were not the source of the hum. You can read some of the articles here: http://seattletimes.com/html/localnews/2019096064_apwawestseattlehum1stldwritethru.html , http://www.king5.com/news/local/Fish-still-candidate-in-West-Seattle-hum-168989126.html , http://www.king5.com/home/Nothing-fishy-about-West-Seattles-now-famous-hum-169399366.html