This can also be an indicator of a sudden change of temperature, or the growth of harmful algae that wipe out massive populations of fish that are sensitive to that kind of thing.
Sharks Swimming in Circles
You should know this by now, but if you’ve literally been living under a rock with no access to the Discovery Channel’s annual “Shark Week” extravaganza, when sharks circle something, they’re trying to eat it. If you find yourself treading water, surrounded by circling sharks, which is highly unlikely but it has happened before, you might want to count your blessings and make amends with yourself, because it’s feeding time for those predatory fish.
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