technical memo 1 estimation of returns of naturally produced coho to the klamath river l.
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Cramer Fish Sciences. Technical Memo #1 Estimation of Returns of Naturally Produced Coho to the Klamath River. Nicklaus K. Ackerman Brian Pyper Ian Courter Steve Cramer. Tech Memo 1. Objectives: Develop basin-wide estimates of run size to populate the initial brood cycle in the model.

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technical memo 1 estimation of returns of naturally produced coho to the klamath river

Cramer

Fish Sciences

Technical Memo #1Estimation of Returns of Naturally Produced Coho to the Klamath River

Nicklaus K. Ackerman

Brian Pyper

Ian Courter

Steve Cramer

slide2

Tech Memo 1

Objectives:

  • Develop basin-wide estimates of run size to populate the initial brood cycle in the model.
  • Develop population/reach escapement estimates for recent broods to allow partitioning of the coho run throughout the basin.
  • Use run size estimates and partitioning system as reference points for future validation of model results.
slide3

Tech Memo 1

Method 1 – Harvest Sampling Approach:

  • Used captures of TRH origin and natural origin coho in Yurok Tribal Fishery, at WCW, and at TRH to estimate basin-wide run size. Evaluated 1999-2005.

Method 2 – Tributary Approach:

  • Used best available information from individual populations/reaches to approximate run sizes in different portions of the basin. Evaluated 2001-2004.
slide4

Coho Enter River from

Estuary in Late Summer - Fall

Harvest Sampling Approach

Trinity River Hatchery

Iron Gate Hatchery

Natural

slide5

Yurok Tribal Harvest Sampling Tells

Us Proportions of TRH, IGH, and Natural Fish

In Estuary and Lower River

Harvest Sampling Approach

Trinity River Hatchery

Iron Gate Hatchery

Natural

slide6

WCW Tells Us Natural:TRH in the Trinity

Harvest Sampling Approach

Change in TRH:Natural Ratios From

Estuary to WCW Tells Us the Proportion

Of Natural Fish in Estuary Moving Here

CDFG Abundance Estimates in Trinity Allow us to Estimate Basin Run Size

Trinity River Hatchery

Iron Gate Hatchery

Natural

slide7

Harvest Sampling Approach

Passage Timing of Coho at WCW

2005 WCW Removal

1999, 2000 WCW Removal

1998, 2001-04 WCW Removal

slide9

Harvest Sampling Approach

Harvest Timing in Yurok Tribal Fishery, 2000-2005

slide10

Tributary Approach

Estuary - Trinity

slide11

Tributary Approach

Klamath Coho Life Cycle Model Reaches:

Williams et al. (2006) Historically Independent Populations:

Lower Klamath River

Middle Klamath River

Upper Klamath River

Shasta River

Scott River

Salmon River

Upper Trinity River

Lower Trinity River

South Fork Trinity River

Lower Klamath River*

Middle Klamath River*

Upper Klamath River*

Shasta River

Scott River

Salmon River

Trinity River

*Mainstem and Tributaries are

modeled seperately so that we

may test effects of mainstem

water management.

slide12

Tributary Approach

Objective:Use the data available to generate rough estimates of abundance for each model reach.

Method Limitation:Diverse suite of methods used inhibits comparison of estimates between reaches.Compounding assumptions affect accuracy and certainty around resulting estimates.

Benefits:Provide approximations of run size where estimates were previously not available. Highlights areas where improved monitoring would be beneficial.Sum of estimates for reaches is useful for comparison to Harvest Sampling Approach estimates.

slide13

Tributary Approach

Primary Data:

Upper Klamath Mainstem

Middle Klamath Mainstem

Lower Klamath Mainstem

Middle Klamath Tribs.

Upper Klamath Tribs.

Shasta River

Scott River

Salmon River

Trinity River

Lower Klamath Tribs.

2001-2005 Mainstem Spawning Surveys

Professional Judgement

2004 Bogus Creek Counts

Shasta run timing and IGH entry timing

Accounting of habitat availability

01-04 Shasta Counting Facility Counts

01-04 Redd and carcass counts

03-04 Spawning surveys

WCW Population Estimates

Regional Juvenile Abundance Estimates

Model Reach:

slide14

Tributary Approach

2003 Passage Timing at Shasta Counting Facility

2002

2003

2001

2004

slide16

Tributary Approach

* Modified from Tech Memo to reflect that some spawners will be assigned to the reach.