Abstract Title

Session S-06D: Marine Survival of Salmon and Steelhead: the Salish Sea Marine Survival Project

Proposed Abstract Title

Puget Sound steelhead marine survival trends: what’s happening to our fish out there?

Keywords

Species and Food Webs

Location

Room 611-612

Start Date

1-5-2014 1:30 PM

End Date

1-5-2014 3:00 PM

Description

Steelhead trout numbers are falling dramatically in the Salish Sea and especially in Puget Sound. To better understand the patterns and put them into context, we seek to confirm the declining steelhead abundance and survival trends (both hatchery and wild fish) in Puget Sound and compare these trends with those in neighboring regions. We will first present productivity trends (specifically smolt to adult returns [SAR]) for hatchery and wild steelhead populations. We found that many coastal populations shared a pattern of declining abundance from the mid 1980s through the mid 90s, and that while many of these populations rebounded in the 2000s, Puget Sound SARs continued to decline and have generally remained below those of other regions. Second, we are performing correlative analyses on these SARs with factors potentially affecting survival including wild and hatchery steelhead smolt abundance, individual and population life-history characteristics, environmental data, and buffer prey data. We will evaluate hypotheses about spatial variation in mortality, size-selective mortality, match-mismatch, and life history variation; additional reference regarding whether and where mortality is concentrated; and account for individual or population characteristics that may differentially affect survival.

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May 1st, 1:30 PM May 1st, 3:00 PM

Puget Sound steelhead marine survival trends: what’s happening to our fish out there?

Room 611-612

Steelhead trout numbers are falling dramatically in the Salish Sea and especially in Puget Sound. To better understand the patterns and put them into context, we seek to confirm the declining steelhead abundance and survival trends (both hatchery and wild fish) in Puget Sound and compare these trends with those in neighboring regions. We will first present productivity trends (specifically smolt to adult returns [SAR]) for hatchery and wild steelhead populations. We found that many coastal populations shared a pattern of declining abundance from the mid 1980s through the mid 90s, and that while many of these populations rebounded in the 2000s, Puget Sound SARs continued to decline and have generally remained below those of other regions. Second, we are performing correlative analyses on these SARs with factors potentially affecting survival including wild and hatchery steelhead smolt abundance, individual and population life-history characteristics, environmental data, and buffer prey data. We will evaluate hypotheses about spatial variation in mortality, size-selective mortality, match-mismatch, and life history variation; additional reference regarding whether and where mortality is concentrated; and account for individual or population characteristics that may differentially affect survival.