catch indicator

例句：

1. 1. The catch indicator for this species is the number of eggs laid.
   这种物种的捕捉指标是产卵数量。
2. 2. The fisherman used a hook and line to catch the fish.
   渔民用钩和线来捕捉鱼。
3. 3. The data collected by the scientist was used to calculate the catch indicator.
   科学家收集的数据被用来计算捕捉指标。