Despite the thousands of Bigfoot that must exist for a breeding population, not a single body has been found.
尽管目击者口中的“大脚”数以千计、足以构成一个繁殖种群，人们却连一具尸体也未曾找到。
And by seeing where these sequences now sit, scientists can get a sense of the size of the breeding population back then.
位置固定的转位子第一次出现是在一百万年前，通过观察现在这些序列的排列顺序，科学家们就可以了解到那个时代的人口数量。
The spawning times, absolute fecundities, age structures of breeding population, and spawning types of fish were also studied.
测定分析鱼类生殖力、产卵期、繁殖群体的年龄结构及产卵类型。
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