求翻译：由此导致鲨鱼总数大幅减少——30年来下降了90%。大量捕杀鲨鱼，导致大量中小型鱼类因失去天敌而数量暴增，从而严重打乱整个海洋生态平衡。是什么意思？

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babylon.0.10._babylon_api_response

From this caused the shark total large reduction - - for 30 years to drop 90%.Captures and kills the shark massively, but causes the massive middle and small scale fish because of to lose the natural enemy quantity storm to increase, thus disrupts the entire sea ecological equilibrium seriously.

正在翻译，请等待...

Which led to significantly reduce the total number of sharks - 30 years to decline by 90%. A large number of sharks killed, resulting in the loss of a large number of small fish predators and the number jumped to seriously disrupt the ecological balance of the ocean.