more than in the whole of the Atlantic Ocean. 这比整个大西洋的鱼类种数还要多

177. where one massive tributary, the Rio Negro, flows into the main river.
     一条巨大的支流 ——内格罗河在此汇入干流
178. Its waters are wonderfully rich.
     河水中的物种异常丰富
179. To date over 3,000 species of their fish have been described -
     据统计 被命名的鱼类已达到3000多种
180. more than in the whole of the Atlantic Ocean.
     这比整个大西洋的鱼类种数还要多
181. The Amazon is so large and rich in fish
     亚马逊河养育着丰富繁多的鱼类
182. that it can support fresh water dolphins.
     为淡水海豚提供了生存条件
183. These botos are huge - two and a half metres long.
     这些亚马逊江豚体型巨大 身长达2.5米

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 180 行