Approximately how long do young bull trout spend dependent on the clean gravel habitats of their natal streams before migrating to larger waters?
Answer
Up to three or four years
A critical aspect of the bull trout's life history that contributes to its vulnerability is the extended dependency period juveniles spend in their natal headwater streams following emergence from the redds. The young fish require the high-gradient, clean gravel habitats to survive their initial developmental stages. This requirement means they reside in these headwaters for a considerable duration, typically up to three or four years, before they gain the size and physiological readiness to migrate out to larger rivers or lakes where they will feed. This long requirement for pristine, stable conditions in the upper reaches of the watershed makes these areas essential conservation targets.
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