Answers

2016-01-16T21:56:59+05:30
This is because only top and some inner area is frozen.These fishes occupy these unfrozen area.
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2016-01-17T09:34:13+05:30
Fishes can survive in cold frozen lakes due to anomalous expansion of water.
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can u explain more??
Sorry I gave the wrong answer. The correct answer is that the top part is frozen and the lower part has a relatively lower temperature. As fishes are cold-blooded animals they can survive in the warmer regions below