Pacific Salmon Explorer

Pacific Salmon Explorer

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Trends in Spawner Abundance

This assessment provides information on the trends in estimated spawner abundance over the long term (all years of data) and short term (most recent three generations) for the selected Conservation Unit(s). Linear trends are estimated on a natural log scale from smoothed spawner abundance time series.

Average spawner abundance per generation
Long-term trend (all years)
Short-term trend (most recent three generations)

Individual Conservation Units (19)

Boundary Bay (Fall 4-1)

Long-term trend: 86% change over all years

Fraser Canyon-Nahatlatch (Spring 5-2)

Long-term trend: -75% change over all years

Lower Fraser River (Fall 4-1)

Long-term trend: -5.7% change over all years

Lower Fraser River (Spring 5-2)

Long-term trend: 54.4% change over all years

Lower Fraser River (Summer 5-2)

Long-term trend: 45.6% change over all years

Lower Fraser River-Maria Slough (Summer 4-1)

Long-term trend: 125.5% change over all years

Lower Fraser River-Upper Pitt (Summer 5-2)

Long-term trend: -85.8% change over all years

Lower Thompson River (Spring 4-2)

Long-term trend: 26.4% change over all years

Middle Fraser River (Spring 5-2)

Long-term trend: -65.9% change over all years

Middle Fraser River (Summer 5-2)

Long-term trend: -19.2% change over all years

Middle Fraser River-Portage (Fall 5-2)

Long-term trend: -69.3% change over all years

North Thompson River (Spring 5-2)

Long-term trend: -86.8% change over all years

North Thompson River (Summer 5-2)

Long-term trend: -49.5% change over all years

Shuswap River (Summer 4-1)

Long-term trend: 158.2% change over all years

South Thompson River (Summer 4-1)

Long-term trend: 3,659.6% change over all years

South Thompson River (Summer 5-2)

Long-term trend: -5.6% change over all years

South Thompson River-Bessette Creek (Summer 4-2)

Long-term trend: -53.5% change over all years

South Thompson-Adams River Upper

Long-term trend: -15.8% change over all years

Upper Fraser River (Spring 5-2)

Long-term trend: -48.2% change over all years

Northern Transboundary

Vancouver Isl. & Mainland Inlets

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