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[Sizik]

It may be due to the fact that both salmon and shad have both OCEAN and RIVER (FRESHWATER, SALTWATER, and BRACKISHWATER) biome tags. They also have a CLUSTER_NUMBER tag, which not all of the vermin fish have.

[Torchy]

Amazing to see how we're still discovering things that have been quietly sitting in the game for (at least) a year and a half, possibly longer. Remember moss?

That aside, it's a bit unsettling to think about all those hundreds and hundreds of fish moving in one river-blotting blob like that. There's something kind of horrifying about looking at that picture.

Spoiler (click to show/hide)

Not the least of which, the thought of what happens if Carp also migrate like this.

[smjjames]

In fact, we may actually see carp migrations someday. Toady set up the underground so that critters will come and go through the map edge and can't be extincted like the surface wildlife can be. I'm not quite sure on the not extincting part however.

[Flying Carcass]

Or worse, zombie carp!

[finesse]

Wow, so when are we going to get fishing nets in DF?

[thvaz]

I hat noticed a long time ago my fisherdwarves caught salmon only a certain time of the year, but never saw a real migration like this.

[MrWiggles]

Amazing to see how we're still discovering things that have been quietly sitting in the game for (at least) a year and a half, possibly longer. Remember moss?

That aside, it's a bit unsettling to think about all those hundreds and hundreds of fish moving in one river-blotting blob like that. There's something kind of horrifying about looking at that picture.

Spoiler (click to show/hide)

Not the least of which, the thought of what happens if Carp also migrate like this.

What does the moss do?

[Sunday]

Moss doesn't really do anything but sit there.  But it's really hard to actually see it in Fortress mode - you have to have a fort that lasts something like 15-20 years (my 13 year fortress doesn't have any moss yet).  So it took a long time to discover (since most forts don't last longer than 5-7 years).

Moss only grows on constructed structures, outside, after a long period of time.

[uberubert]

So I was thinking... Would an overly complicated system of floodgates, pumps and waterchannels make it possible to harvest an entire rivers worth of fish?

Twice a year, just pull the lever for food!

[RedWarrior0]

The suggestion above mine is awesome. I'd like to see if we could forcibly harvest the entire salmon run. We'd need to block the river off from upstream, though, so it might dry out. Also, can they spim through fortifications?

[Chicken Launcher]

Do weapon traps work on fish? Because I'm imagining a section of the river blocked off with floodgates, but flowing down through a channel filled with weapon traps. It would end at a fish collection area covered in grates, next to some fisheries. The good part is that water pressure would push the dead fish along after they get "processed."

[Mechanoid]

I've noticed that effect before in the ocean with jellyfish.  It's quite surreal to see what looks like a swarm of statues suddenly washing up on shore.  The pattern in the ocean is a lot more circular at first and flows with the waves towards the shore.

In DF 2010 there will be contact poisons.
Make sure your dwarves are wearing foot protection when they walk on said jellyfish-covered beach.

[Dakk]

Or you could pour magma over it then miner the obsidian: Mine for fish!

Anyway, I think since they aren't vermin, they shoudn't be able to swim throygh fortifications. You could try using grades or bars too though.

[RedWarrior0]

If they're fish you actually fish for, they're vermin. As in, they would leave behing "remains" instead of a corpse

[Diablous]

Shad Runs... Dear God... I love this game!