I don't normally recommend other blogs before I vet them for accuracy; however, you need to read this: There are mass animal deaths across the globe in 2013. (This blog seems to be Seventh Day Adventist, so I agree with much of what they say.)
Event Summary for 2013 - 192 Known Mass Death Events in 46 Countries
Massive ocean creature deaths are generally related to earthquakes. Are these signs of impending earthquakes? Maybe.