1) There are species of small "catfishes" (on Asia or Australia if I remember correctly) known to climb waterfalls in rainforests. We are talking about > 100m long fully vertical waterfalls.
2) In fact, they aren't catfishes. Belong to a big family of mainly marine fishes called gobies. Totally different orders. Should be named climbing gobies.
3) They do it for the same reason as Salmons do: to reproduce in freshwater.
4) But unlike salmons they don't swim or jump. They climb the slippery rock wall like a freestyle climber, using the suction cups in their belly that gobies have (pelvic fins transformed), and their other fins and tail to propel
Also interesting is the presence of Ancistrus and Hypostomus in the mix of climbing fishes. Many people keeping aquariums breed this fishes at home. The first can lay eggs and care for the fry, the second is very difficult to breed.
2) In fact, they aren't catfishes. Belong to a big family of mainly marine fishes called gobies. Totally different orders. Should be named climbing gobies.
3) They do it for the same reason as Salmons do: to reproduce in freshwater.
4) But unlike salmons they don't swim or jump. They climb the slippery rock wall like a freestyle climber, using the suction cups in their belly that gobies have (pelvic fins transformed), and their other fins and tail to propel
5) Somebody filmed those fishes climbing.