a quick 4 mins of birds fishing in the ocean I think the birds are Gannets.

About Gannets 

Gannets candive from a height of 100 feet, achieving speeds of 160 MPH as they strike the water, enabling them to catch fish much deeper than most airborne birds. Thegannet's supposed capacity for eating large quantities of fish has led to "gannet" becoming a description of somebody with a voracious appetite.