Influences affecting habitat, access to habitat, water quality and species composition (competition, hybridization or predation with non-native species) throughout a watershed ultimately affect the health and viability of native fish populations in streams, rivers and lakes. It also highlights the vulnerabilities of migratory fishes to anthropogenic influences throughout their habitat range. The spatial distribution and diverse habitat needs of native fluvial and adfluvial fishes emphasize the importance of sustaining watershed health and habitat connectivity. Resident fish reside entirely in natal streams, while fluvial and adfluvial fishes out-migrate from natal streams as juveniles to larger rivers ( fluvial), or lake environments ( adfluvial) growing to maturity before returning to spawn.įish can reach sexual maturity faster in lakes than rivers and streams due to increased productivity. Native trout species such as bull trout, westslope and Yellowstone cutthroat trout may exhibit three distinct life history patterns that can encompass sizeable geographic areas.
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