Have to disagree with Mike and undertow. Your shutter speed is slow enough for the strobe to fill the scene. I would tend to agree if you had a shutter speed that was faster than your strobe (ie 1/250 or faster) but slow is not usually a problem. See my photo below with same shutter speed both upclose and wide angle (shutter speed 1/100-1/160). I do agree that you should shoot in M mode.
I think you've misunderstood Mike and I. What we said has nothing to do with the strobe syncing with the camera (i.e. having too fast a shutter speed).
This is basic exposure stuff. When using strobes, you're mixing 2 forms of light:
1. Strobe Light
- strobe exposure determined by combination of strobe power and aperture
2. Ambient light from the sun
- ambient exposure determined by combination of shutter speed and aperture
In your excellent images, kdgonzalez, if you erased the strobe light (if your strobe didn't fire), they would be very dark, very underexposed. The eel image would likely be black. That means you have a dark ambient exposure. The issue with the original poster's images was that the ambient exposure was way too bright to begin with.
There's no room for disagreement here, this is 100% true.