MANAGEMENT OF NATURAL LAKES & HERPETOLOGICAL POPULATIONS. Approximately 240 natural mountain lakes are nestled within the rugged landscape of North Cascades. The steep, cascading streams that are one of the hallmarks of North Cascades historically prevented fish from entering the mountain lakes. Though naturally barren of fish, these fishless lakes historically contained a rich array of native aquatic life including plankton, aquatic insects, frogs and salamanders. The stocking of some of these lakes with fish began in the late 1800s and continues to this day.
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