Upper Midwest Environmental Sciences Center

Historical fisheries mark/recapture and telemetry data base

Last updated on April 11, 2006

A fisheries mark/recapture and telemetry database for all known data on the Upper Mississippi River through 1995 was developed at the Upper Midwest Environmental Sciences Center. An explanation of each variable follows. The original studies involved are listed in the table "Mark/recapture and telemetry studies on the Upper Mississippi River through 1995" (hyperlink above).
Additional information is included in a draft report.

Variable

Explanation

Species

The fish species from the original study.

Tagedin

The pool where a fish was originally tagged.

Study

An arbitrary number used to track each historical study. Information is included in the table below.

Yrm

The year when a fish was marked.

Yrr

The year when a fish was recaptured.

The Julian day when a fish was recaptured.

The Julian day when a fish was marked.

At_large

The number of days between marking and recapture for a particular fish.

Dams_pas

The number of dams between the pool where a fish was marked and where it was recaptured. A positive number signifies that the fish moved upriver and a negative number downriver. The data set contains a separate observation for each dam crossing. For example, if a fish crossed 4 dams moving in a downriver direction, there would be four observations for that fish with Dams_pas equalling minus four.

Mine_d

The minimum head differential at the downriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool. This variable is not used for fish marked and recaptured in different pools.

Maxx_d

The maximum head differential at the downriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool. This variable is not used for fish marked and recaptured in different pools.

Damcr

A dam crossed by a particular fish.

Mine

The minimum head differential at a dam, during the at large period, for fish that were marked and recaptured in different pools, or the minimum head differential at the upriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool.

Maxx

The maximum head differential at a dam, during the at large period, for fish that were marked and recaptured in different pools, or the maximum head differential at the upriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool.

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fishpassage.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified: October 2, 2007

Variable	Explanation
Species	The fish species from the original study.
Tagedin	The pool where a fish was originally tagged.
Study	An arbitrary number used to track each historical study. Information is included in the table below.
Yrm	The year when a fish was marked.
Yrr	The year when a fish was recaptured.
Dr	The Julian day when a fish was recaptured.
Dm	The Julian day when a fish was marked.
At_large	The number of days between marking and recapture for a particular fish.
Dams_pas	The number of dams between the pool where a fish was marked and where it was recaptured. A positive number signifies that the fish moved upriver and a negative number downriver. The data set contains a separate observation for each dam crossing. For example, if a fish crossed 4 dams moving in a downriver direction, there would be four observations for that fish with Dams_pas equalling minus four.
Mine_d	The minimum head differential at the downriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool. This variable is not used for fish marked and recaptured in different pools.
Maxx_d	The maximum head differential at the downriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool. This variable is not used for fish marked and recaptured in different pools.
Damcr	A dam crossed by a particular fish.
Mine	The minimum head differential at a dam, during the at large period, for fish that were marked and recaptured in different pools, or the minimum head differential at the upriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool.
Maxx	The maximum head differential at a dam, during the at large period, for fish that were marked and recaptured in different pools, or the maximum head differential at the upriver end of the pool, during the at large period, for fish that were marked and recaptured in the same pool.