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[minsyoo]

Basic and simple question,

I see pinks jump all the time,

I wonder why???

[milo]

Because they don't have fingers.

[milo]

On a more serious note, it depends on the species and circumstances.
Excepting the obvious jumps when hooked (trying to unhook themselves), fish can jump for the following reasons: going after an airborne insect (especially trout); escaping predators (especially saltwater species); cleaning their gills (sturgeon, carp, some salmon species).
Some, like the chinese flying carp jump when they become agitated by intense light and/or noise.

As for pinks and other salmon in rivers, it could be that they are trying to loosen up their eggs skeins and milt sacks prior to spawning.

Last, but not least, they might be listening to VanHalen.

[Frankey]

Ive heard they jump to try and shake free the sea lice attached to thier bodies.

[searun17]

simple,they are playing jump rope with all the 6 foot leaders coming at them

[Matt]

I dunno, but I'd get a little keyed up before a one night stand with 2 million females.

[Fish Assassin]

They want to have a look at the "fishermen" trying to catch them with 12' leaders.

[warlo_527]

Wouldn't you jump too if you evaded humans, nets across the Fraser, predators, sea lice, swam 1000's of kilometers, lack of plankton and food,  some more seals, other predators again, humans again, certainly more nets across the Fraser, 12 foot leaders, and then all of a sudden you smell your "home" stream! I would be jumping for joy too!

[aquaholic]

In an issue of BC outdoors magazine i think its 3 issues ago or maybe 4 not to sure I cant remember , has a detailed article why fish jump, I don't remember word for word what the article said, but I'm sure it had something to do with them sensing there home streams/rivers and them entering different types of water , you have to read the article to really get a decent answer, I threw the mag out, or i would have scanned and posted it up

[vapor]

I've also heard its for the whole sea lice thing...

[samw]

In an issue of BC outdoors magazine i think its 3 issues ago or maybe 4 not to sure I cant remember , has a detailed article why fish jump, I don't remember word for word what the article said, but I'm sure it had something to do with them sensing there home streams/rivers and them entering different types of water , you have to read the article to really get a decent answer, I threw the mag out, or i would have scanned and posted it up

Trying to sense where they are is what I think too.  On the Fraser, I noticed a lot of jumping during a tide change when they got confused and were swimming with the tide back towards the ocean.  Maybe jumping helps them find out that they shouldn't go back out with the tide?

[yakideath12]

saw on fishing magazine. The researchers said that they are finding their way.

[hue-nut]

In an issue of BC outdoors magazine i think its 3 issues ago or maybe 4 not to sure I cant remember , has a detailed article why fish jump, I don't remember word for word what the article said, but I'm sure it had something to do with them sensing there home streams/rivers and them entering different types of water , you have to read the article to really get a decent answer, I threw the mag out, or i would have scanned and posted it up

yeah I read it too, they are apparently scooping the water from the surface into their nostrils, this water has some type of signature of their home stream/river kinda like dna.

[fishherron]

All good reasons. I have seen Coho, Sockeye,Chum jumpimg far out in the ocean and the middle of Hecitc stright. Fish jump because they can.

[Frankey]

Its great that do jump, provides some excitement when on the end of your line,probally then they are trying to spit the hook out.