The bigeyes are the equivalent of bats. 大眼鲷相当于蝙蝠

221. For these fish the caves are a night time retreat,
     对于这些鱼来说 洞穴是理想的过夜场所
222. but they're not the only commuters in here.
     但它们并非这里的唯一住客
223. There are other fish working to a different schedule.
     这里还有其它 按照不同日程表生活的鱼
224. The bigeyes are the equivalent of bats.
     大眼鲷相当于蝙蝠
225. Night feeders leave the cave each evening.
     它们每天晚上出洞觅食
226. And like all cave commuters
     和所有洞穴动物一样
227. they are most vulnerable at the scheduled time of departure.
     它们在出发阶段最容易遭受攻击

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 224 行