03-04-2015, 07:17 PM
The biologists caring for the Colorado and San Juan river endangered species are wary of ANY new introduction because escapement may cause a di
vantageous competitive situation with native fish.
The National Park service has similar concerns introducing ANY non-native species.
Or, as in the case of the gizzard shad migrating upstream, it may draw more predators into the rivers from the lake (Walleye and Northern Pike) following food.
There has been an explosion of predatory fish in the Colorado specifically over the last few years. Gizzard shad migration drawing out predators is a likely contributor.
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vantageous competitive situation with native fish.The National Park service has similar concerns introducing ANY non-native species.
Or, as in the case of the gizzard shad migrating upstream, it may draw more predators into the rivers from the lake (Walleye and Northern Pike) following food.
There has been an explosion of predatory fish in the Colorado specifically over the last few years. Gizzard shad migration drawing out predators is a likely contributor.
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