Some individuals would therefore not have been caught, since no baited hooks would have been available to trap them, leading to an underestimate of fish stocks in the past.
因为没有可利用的带诱饵的钩子来捕捉它们，个别的鱼没有被捕获，这导致过去人们低估了鱼类的数量。
2
In this case, changes in biomass were estimated by comparing the number of fish caught for every 100 hooks now and in the past.
这种情形下，生物量变化通过比较目前和以前每100条鱼钩的捕获量来进行估计。
3
So far, she and her colleagues have only excavated two small test pits at the cave, which contained a number of stone artefacts, bone points, animal remains, shell beads and fishhooks.