Stone
Contributor
I saw an interesting phenomenon yesterday.
Our third and last dive of the day was on concrete rubble in the sand at 60 fsw. Five minutes into the dive, a large Bull shark (at least 8 ft and really fat) swam up to investigate us. He got to within 7 feet for a moment then turned around. I know it was 7 feet because that's the distance from me to the outstretched tip of my speargun.
Here's the phenomenon:
Even though the shark disappeared from view as he swam into the gloom (30 ft viz), you could still see his big fat shadow on the sand. As he continued to circle us for the rest of the dive, it would always be the shadow that caught my attention first. Sometimes all we could see was the shadow, and sometimes he'd get close enough to reappear. Obviously, the shark was perfectly camouflaged for the water conditions, but his shadow contrasted quite well with the light colored sand.
No speared fish on that site, but an interesting dive anyway.
Our third and last dive of the day was on concrete rubble in the sand at 60 fsw. Five minutes into the dive, a large Bull shark (at least 8 ft and really fat) swam up to investigate us. He got to within 7 feet for a moment then turned around. I know it was 7 feet because that's the distance from me to the outstretched tip of my speargun.
Here's the phenomenon:
Even though the shark disappeared from view as he swam into the gloom (30 ft viz), you could still see his big fat shadow on the sand. As he continued to circle us for the rest of the dive, it would always be the shadow that caught my attention first. Sometimes all we could see was the shadow, and sometimes he'd get close enough to reappear. Obviously, the shark was perfectly camouflaged for the water conditions, but his shadow contrasted quite well with the light colored sand.
No speared fish on that site, but an interesting dive anyway.