Capturing a decisive moment such as this can really add a lot of movement to an otherwise still wildlife photograph. Subjects such as slow moving herons and egrets are perfect to practice on. By utilizing a tripod to compose for the body of the heron, one must simply choose a high enough shutter speed (1/2500th second in this case) and hold down the shutter button when the action begins. Higher frame rate cameras are certainly beneficial here, but you can get by with about 5 frames per second or so quite well.
About the Image: Using a slightly higher ISO of 400 here was important to quicken up the shutter speed a bit to 1/2500th second. In hindsight, I probably should have chosen ISO 800 as 1/2500th is right on the edge of capturing such a quick movement sharply. However, it did work out in this case and I'm glad it did! Additionally, I chose an aperture of f/7.1. instead of wide open to add a bit of depth of field in case the heron's head and eye moved slightly out of focus during the strike. Exposure was quite straight forward, spot metering the blue water at -1 exposure compensation let everything fall into place. In regards to composition, I let the heron sit quite far to the right to not appear too centralized and to allow space for water droplets to fly up on the left. Those flying drops of water add movement and are an integral part of the composition. They also look damn cool, and I wouldn't want to miss out on being able to include them in my image!
Techs: Canon 7D, Canon 400 f/5.6. 1/2500th second, f/7.1., ISO 400. Tripod.