Answers

2015-12-28T19:12:38+05:30
Because a high percentage of both the eggs and young are meals for other links in the food chain.
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2015-12-28T19:17:41+05:30
Because 
they have been caught by fishermen 
their egg are damaged in flood and stamped or eaten by animals or humans
sometimes it is not fertilized by sperms.
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