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Dear Fish List Colleges,
First alittle background information. We are conducting a coho
reintroduction study in the mid and upper tributaries (Yakima, Wenatchee,
Methow) to the Columbia River using a lower river broodstock (since all mid
and upper river stocks are extripated). Last fall in the 3 tributaries we
are reintroducing coho we noticed females (primarily) dropping out and
spawning well short of their acclimated release sites, suggesting that
there's an energenics issue. Essentially a stammina issue in that a lower
river stock fish is "being asked" to upmigrate a much greater distant than
normal. We have noticed less than ideal or normal egg-to-fry survival in
the hatchery from these hatchery broodstock in all 3 subbasins. I'm
wondering if the poor incubation survival rate is somehow related to poor
egg quality that is related to upmigration stress? Is there methods to
measure egg quality (i.e. amounts of lipids, protiens, etc)?
Water quality tests have have shown nothing to suggest that the water source
is the problem, as well as, the pathological results.
Thanks for your ideas and thoughts.
Joel Hubble
Yakama Tribe
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