Tuesday, October 11, 2022

Low water and dry rocks

 It rained this morning. Gently, for a few minutes, enough to dampen the roads. Too little, too late. But it's a start, anyhow.

The river has been so low that salmon haven't been able to spawn, dying before they have reached the egg-laying sites. Walking along a side channel on Sunday, peering into the water at every clear spot, we saw maybe a half-dozen small fish, a few inches long, and 2 very dead adult salmon.

“There are definitely a lot of (salmon) populations struggling with really low, really warm water. And it presents all kinds of challenges.

When they are in warm water like that, there is less oxygen available and their immune systems become compromised. They are more vulnerable to predators and they have less energy.”

Low water levels can stop them from spawning and even if water comes in, they might not have enough energy to dig a nest and lay eggs by then. (From the Vancouver Sun, Oct 5.)

These are views of the river below the John Hart Dam, taken a couple of weeks ago. The whitish borders of the river mark the normal water level.

Flowing over rocks

Quiet pool.

There's a small post up against the rocks, probably with markings for measuring the water level.

There's still no rain in the weather forecast for the next week.

~~~~~~~~~~~~~~~~~~~~~~~~~
Esta mañana llovió. Por unos momentos, levemente, suficiente como para humedecer las calles, y ya. Bueno, es algo, aunque poco y tarde.

El rio anda tan bajo que los salmones no han logrado depositar sus huevas, muriendo antes de llegar a los sitios de siempre. Caminando al lado del rio el domingo, buscando en toda oportunidad en el agua, vimos unos cuantos pescaditos, y dos salmones adultos, bien muertos.

"Definitivamente hay muchas poblaciones de salmones que sufren ahora porque el agua está cálida y no hay suficiente. Esto les presenta muchos retos.
Cuando están en agua tibia, hay menos oxígeno disponible y sus sistemas imunológicos pierden su eficacia. Son más susceptibles a la predación y les falta energías."
Niveles bajos de agua les puede impedir depositar sus huevas, aun si sube el agua, para entonces ya les puede faltar suficiente energía para excavar sus nidos y poner allí las huevas. (Tomado de el Vancouver Sun, el 5 de octubre.)
Fotos: el rio debajo de la presa John Hart, hace quince dias. Se ve por la marca blanquisca el nivel normal del rio. En la tercera foto, se ve un poste blanco en frente de las rocas; este probablemente sirve para medir el nivel del agua.

Y viendo el pronóstico del tiempo, no se ven indicios de lluvia en toda la semana que entra.

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