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April 2002 Feature

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Fish Facts!

Pacific Lamprey redds are seen in conjunction with which species of anadromous fish during spawning surveys?

Winter Steelhead.  Pacific Lamprey are also an anadromous species.  They return to freshwater streams between the months of July and September, and then spend October through March hiding under rocks.  Redd building takes place from April to July of the following year.  Pacific Lamprey create redds by digging shallow nests in sandy gravel using body movements and their suctorial disc to move and reposition rocks.  Pacific Lamprey redds are typically smaller than their fish counterparts and many winter steelhead spawning reports include notes on incidental lamprey sightings.

Lamprey Life Cycle  Academic Press Inc.

For additional information on Pacific Lamprey, see:

Oregon Lampreys: Natural History Status and Problem Analysis, a report by Kathryn Kostow, Oregon Department of Fish and Wildlife, January 24, 2002

plus, these other web sites:

http://www.dfw.state.or.us/ODFWhtml/InfoCntrFish/lamprey.pdf http://www.psmfc.org/habitat/edu_lamprey_fact.html

For lamprey photos, please visit our Fish Photos page.

What is a 2 year old returning spring chinook called, as opposed to a 3/4 year old jack or an adult?

A mini-jack.

For additional information on Chinook Salmon, see:

Which dam reported more Sea-run Cutthroat in 1999, Powerdale Dam on the Hood River or Winchester Dam on the North Umpqua River?

Winchester Dam.  Winchester Dam collected 96 Sea-run Cutthroat between 4/31/99 and 3/31/00, while Powerdale Dam reported 0 Sea-run Cutthroat in 1999.  Powerdale Dam has not reported any Sea-run Cutthroat since 1992, when 5 were collected at this facility.

For additional information on Sea-run Cutthroat, see:

Which of these three rivers, Wilson, Trask, Or Nestucca River, reported the greatest number of Sea-run Cutthroat per survey mile during resting hole, snorkeling surveys in 2000?

The Trask River.  A total of 301 Sea-run cutthroat were seen in the 14 miles of survey area on the Trask River, for an average fish per mile count of 21.5.  The Nestucca River Sea-run count was 128 in a 15 mile survey area, averaging 9 fish per mile.  The Wilson River came in last with a total count of 61 within a 21 mile survey area, the average fish per mile count was 2.9.

This month's feature was written by: Shannon Hurn
These fish facts, as well as many others, can be found in ODFW's Trend database on the StreamNet web site.
The Lamprey facts can be found in the book, Freshwater Fishes of Canada. ed. W.B. Scott and E.J. Crossman.
The Lamprey Life Cycle diagram is shown courtesy of Academic Press Inc., and Prentice Hall.

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