The OSU Stream Team readies for a day of field work on the Aquatic Vertebrate Population Study in Mack Creek
Aquatic Vertebrate Population Study in Mack Creek 2021
The Aquatic Vertebrate Population Study in Mack Creek (1987 to present) is a long-term study on populations of cutthroat trout and salamanders in two reaches of Mack Creek in the HJ Andrews Experimental Forest. Each year, since 1987, researchers visit the same stretches of the creek to measure the numbers, size, and weight of the fish and salamanders. Researchers use electroshockers to temporarily stun the fish and salamanders so they can be measured and weighed, before being returned back into the stream. Some fish and salamanders are fitted with a PIT tag. The PIT tag allows researchers to track the movement and changes to an individual fish or salamander over time. Using results of the work, Dr. Ivan Arismendi worked with K12 teacher Leilagh Boyle to create a “Data Nugget” free classroom activity, co-designed by scientists and teachers. The Data Nugget is a fun way to learn more about the project: https://datanuggets.org/2019/01/all-washed-up/
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_001
The OSU Stream Team sets off for Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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laying a net across Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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nets are used for catching fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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nets are used for catching fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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An electroshocker is used to temporarily stun fish and salamanders so they can be captured and measured
Photographed by: Lina DiGregorio
Date: 9/7/2022
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An electroshocker is used to temporarily stun fish and salamanders so they can be captured and measured
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_007
Dr. Ivan Arismendi readies the electroshocker
Photographed by: Lina DiGregorio
Date: 9/7/2022
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This little pool of water in Mack Creek is home to cutthroat trout and pacific giant salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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This little pool of water in Mack Creek is home to cutthroat trout and pacific giant salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_010
Netting is placed across the stream to keep fish and salamanders from escaping the study section of stream
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Netting is placed across the stream to keep fish and salamanders from escaping the study section of stream
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_012
Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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The research team moves as an orchestrated group, electroshocking and netting fish as they move forward
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_016
electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_017
electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Graduate student Emilee Mowlds nets fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Christina Linkem and Ivan Arismendi netting fish in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Ava Betts, Emily Mowlds, Christina Linkem, and Ivan Arismendi electroshocking and netting fish
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Dave Leer , Ivan Arismendi, Emily Mowlds, and Christina Linkem electroshock and net in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Ivan Arismendi and Christina Linkem work together to net fish out of Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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The research team moves as an orchestrated group, electroshocking and netting fish as they move forward
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_027
Researchers have to move quickly and carefully to catch salamanders
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Date: 9/7/2022
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Christina Linkem is at the ready, watching for a flash of fish or salamander that is temporarily stunned by the elecroshocker
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Ivan Arismendi uses the electroshocker
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Date: 9/7/2022
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Ivan Arismendi uses the electroshocker
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Date: 9/7/2022
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Christina Linkem is at the ready, watching for a flash of fish or salamander
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Emily Mowlds transfers fish or salamanders from the net into a bucket
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Date: 9/7/2022
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Christina Linkem is at the ready, watching for a fish or salamander
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Fish and salamanders are moved into buckets to await being measured. After being measured, the animals are released back into the same section of stream from where they were captured.
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_036
Coastal giant salamander (terrestrial form)
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Date: 9/7/2022
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Coastal giant salamander (terrestrial form)
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Mike Manning records data on species, stretch of stream, weight of animal, PIT tag number, and any comments, for each fish or salamander captured
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_039
Data are recorded on species, stretch of stream, weight of animal, PIT tag number, and any comments, for each fish or salamander captured
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Measuring body length of a cutthroat trout
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Measuring body length of a pacific giant salamander
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Date: 9/7/2022
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The crew records length and weight of the captured fish and salamanders and inserts a PIT tag in the larger animals
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_043
The crew records length and weight of the captured fish and salamanders and inserts a PIT tag in the larger animals
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_044
electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Emilee Mowlds electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Christina Linkem scans the stream for fish or salamanders
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Date: 9/7/2022
Photo number: afb_048
A tagged piece of wood, part of a long-term study on wood in streams
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_049
Arif Jan and Ivan Arismendi sample for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Arif Jan and Ivan Arismendi sample for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Arif Jan and Ivan Arismendi sample for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_052
A tagged piece of wood, part of a long-term study on wood in streams
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_053
Arif Jan and Ivan Arismendi sample for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_054
Arif Jan and Ivan Arismendi sample for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Arif Jan samples for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Arif Jan samples for fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Christina Linkem, Emilee Mowlds, and Andres Olivos sample fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Christina Linkem, Emilee Mowlds, and Andres Olivos sample fish and salamanders in Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_059
Sometimes the salamanders wriggle under rocks and need to be coaxed out. Christina Linkem doesn't let this salamander escape!
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_060
Emilee Mowlds and Andres Olivos electroshocking and netting fish and salamanders
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_061
The research team moves together, electroshocking and netting fish as they move forward
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_062
A tagged piece of wood, part of a long-term study on wood in streams
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_063
The research team moves together, electroshocking and netting fish as they move forward
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_064
The crew records length and weight of the captured fish and salamanders and inserts a PIT tag in the larger animals
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_065
Small PIT tags are insterted into larger fish and salamanders, allowing the researchers to track the animal's growth and movement over time
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Measuring body length of a cutthroat trout
Photographed by: Lina DiGregorio
Date: 9/7/2022
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A fish is scanned to check its PIT tag
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Andres Olivos measures the stream width
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Date: 9/7/2022
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Arif Jan in Mack Creek at the HJ Andrews Experimental Forest
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Andres Olivos and Arif Jan measure the pool size within the Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Andres Olivos and Arif Jan measure the pool size within the Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_072
Arif Jan measures the depth of a pool in Mack Creek
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Date: 9/7/2022
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Andres Olivos and Arif Jan measure the pool size within the Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_074
Andres Olivos and Arif Jan measure the pool size within the Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_075
Andres Olivos uses a laser tool to measure the length of a reach of Mack Creek
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_076
Research netting and sample reaches in Mack Creek
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Date: 9/7/2022
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A pool in Mack Creek
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Date: 9/7/2022
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Tagged tree in Mack Creek old growth stand
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Date: 9/7/2022
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Matt Betts and Ava Betts in Mack Creek old growth stand
Photographed by: Lina DiGregorio
Date: 9/7/2022
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Mack Creek old growth stand
Photographed by: Lina DiGregorio
Date: 9/7/2022
Photo number: afb_081