within 15 years of the start of exploitation怎么翻译疑问

According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) in a news fishery is reduced on average by 80% within 15 years of the start of exploitation.

红色部分的15年 “指的是开采的开始这一整个阶段一共15年” 还是 “开采开始后的15年呢”?

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