Lets see...
The waters have gone. No longer is the surface a place to grow accustomed to the strange water. Even so, the bulls feel it is time to find the source. Time to find what the kadesh have been holding in the center of their domain. Bulls from all the major schools collect on the borders of kadesh territory, the waters humming with the rapid messages of electricity they use.
Suddenly, all humming stops. The attack has begun! The Shrike jet around the bay, any and all life being devoured. Anything that moves except for fellow Shrike get shocked. The move like wolves over the many beaches and corals of the bay.
And yet, they found nothing. No kadesh. This troubles the Shrike. They were expecting a feast, a glorious battle over the bay. Some of the bulls move towards the outlet of the river, observing and studying the strange water. They have spent generations growing accustomed to this water, and find no problem with it other than the current.
Meanwhile, nearly 750 miles away is the southern school of Shrike. Their journey has been slow, focusing more on making a living where they stand than migrating. They start a search for any place where they could live, because moving like this any further could doom them all. Even the mothers and pups are taking active part in the hunts, just to get enough to live on.
Even in their simple brains, they know that if they stayed there would have been starvation anyway. Some return to near the surface, observing the small layer of freshwater their parents used to grow accustomed to. However, instead of freshwater they found small spores. At first they wre confused. They shocked them, but that didn't cause any movement. It smelled like food, but didn't act like it.
In their hunger, they decided that it was best to try it out. They would nip at the spores, a megar meal that helped their hunger and supplimented the hunts.
Anyway, no EP investment this time. I'm saving up for a grand evolution, and having them focus more on moving then growing. The southern school should be more of a migration and less of a general growth. The northern tribes are moving into former kadesh waters, a little shocked by the lack of prey. Now just having them grow here before moving up the river.