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Title: Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.

Abstract

The elevation of Lake Pend Oreille was kept 1.2 m higher during the winter of 1997-1998 in an attempt to recover the impacted kokanee fishery. This was the second winter of a scheduled three-year test. Hydroacoustic surveys and trawling were conducted in the fall of 1998 to assess the kokanee population. We estimated the abundance of wild and hatchery fry in the lake at 3.71 million by hydroacoustics. These originated from an estimated 11.2 million eggs spawned during the fall of 1997. The survival from wild spawned eggs to wild fry was 9.7%, which is the highest egg-to-fry survival rate on record. This is the strongest indication to date that higher lake levels were having a direct benefit to the kokanee population. By trawling, we found that total kokanee abundance in the lake dropped to a new record low of 2.8 million fish. The number of adult kokanee in the lake was below average: 100,000 age 4 kokanee (100% mature) and 730,000 age 3 kokanee (29% mature). These fish laid an estimated 52.1 million eggs in 1998. Hatchery personnel collected 9.0 million eggs which were cultured, marked by cold branding the otoliths, and the resulting fry stocked into the lakemore » in 1999. Peak counts of spawning kokanee were 5,100 fish on the shoreline and 9,700 fish in tributary streams; unusually high considering the low population in the lake. Opossum shrimp Mysis relicta declined in the southern two sections of the lake but increased in the northern end. Immature and mature shrimp (excluding young-of-the-year [YOY] shrimp) densities averaged 426 shrimp/m{sup 2}. The number of waterfowl using the lake in the winter of 1998-1999 increased from the previous three years to over 30,000 ducks, geese, and swans.« less

Authors:
; ;  [1]
  1. (Idaho Department of Fish and Game, Boise, ID)
Publication Date:
Research Org.:
Bonneville Power Administration, Portland, OR (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
776429
Report Number(s):
DOE/BP-98065-3
TRN: AH200120%%482
DOE Contract Number:  
00004003; 1997BI98065
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ABUNDANCE; ADULTS; GEESE; LAKES; MARSUPIALS; PERSONNEL; SHRIMP; FISHERIES; KOKANEE SALMON - EFFECTS OF WATER LEVELS ON - IDAHO - PEND OREILLE, LAKE; FISHERY MANAGEMENT - IDAHO - PEND OREILLE, LAKE

Citation Formats

Maiolie, Melo A., Ament, William J., and Harryman, Bill. Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.. United States: N. p., 2000. Web. doi:10.2172/776429.
Maiolie, Melo A., Ament, William J., & Harryman, Bill. Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.. United States. doi:10.2172/776429.
Maiolie, Melo A., Ament, William J., and Harryman, Bill. Mon . "Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.". United States. doi:10.2172/776429. https://www.osti.gov/servlets/purl/776429.
@article{osti_776429,
title = {Lake Pend Oreille Fishery Recovery Project, 1997-1998 Annual Report.},
author = {Maiolie, Melo A. and Ament, William J. and Harryman, Bill},
abstractNote = {The elevation of Lake Pend Oreille was kept 1.2 m higher during the winter of 1997-1998 in an attempt to recover the impacted kokanee fishery. This was the second winter of a scheduled three-year test. Hydroacoustic surveys and trawling were conducted in the fall of 1998 to assess the kokanee population. We estimated the abundance of wild and hatchery fry in the lake at 3.71 million by hydroacoustics. These originated from an estimated 11.2 million eggs spawned during the fall of 1997. The survival from wild spawned eggs to wild fry was 9.7%, which is the highest egg-to-fry survival rate on record. This is the strongest indication to date that higher lake levels were having a direct benefit to the kokanee population. By trawling, we found that total kokanee abundance in the lake dropped to a new record low of 2.8 million fish. The number of adult kokanee in the lake was below average: 100,000 age 4 kokanee (100% mature) and 730,000 age 3 kokanee (29% mature). These fish laid an estimated 52.1 million eggs in 1998. Hatchery personnel collected 9.0 million eggs which were cultured, marked by cold branding the otoliths, and the resulting fry stocked into the lake in 1999. Peak counts of spawning kokanee were 5,100 fish on the shoreline and 9,700 fish in tributary streams; unusually high considering the low population in the lake. Opossum shrimp Mysis relicta declined in the southern two sections of the lake but increased in the northern end. Immature and mature shrimp (excluding young-of-the-year [YOY] shrimp) densities averaged 426 shrimp/m{sup 2}. The number of waterfowl using the lake in the winter of 1998-1999 increased from the previous three years to over 30,000 ducks, geese, and swans.},
doi = {10.2172/776429},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

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