Details:

Personal Author:
Satterthwaite, William H. ; O'Farrell, Michael R. (Michael Robert) ; Mohr, Michael S. ;
Satterthwaite, William H. ; O'Farrell, Michael R. (Michael Robert) ; Mohr, Michael S. ; Less -
Corporate Authors:
Southwest Fisheries Science Center (U.S.) ;
NOAA Program & Office:
NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) ;
NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) ; Less -
Description:
"An evaluation of appropriate levels of sampling needed to develop age composition estimates was made by appealing to multinomial sampling theory. Random sample sizes of at least 600-800 read scales are recommended for each stratum where age composition is of interest. This will suffice to assure confidence intervals on proportions in each age class no wider than 0.05, provide acceptable relative precision for reasonably small proportions, and have a high probability of detecting rare age classes when present. Sample sizes have tended to be larger than the recommended levels at Iron Gate Hatchery, Trinity River Hatchery, the Yurok tribal fishery, and in some cases, the total river recreational fishery and the Hoopa Valley tribal fishery. Spawners in some sectors (e.g., Scott River, Bogus Creek,Willow CreekWeir) have generally been sampled adequately for scales, while others (e.g., Salmon River, Shasta River, lower Trinity mainstem) have frequently been undersampled"--Executive summary.
Content Notes:
William H. Satterthwaite, Michael R. O'Farrell, Michael S. Mohr. "September 2013." Also available in print. System requirements: Adobe Acrobat Reader. Includes bibliographical references (pages 19-20).
Keywords:
[+]
Age
Age Determination
Chinook Salmon
Chinook Salmon Fisheries
Management
Spawning

Series:
NOAA technical memorandum NMFS ; NOAA-TM-NMFS-SWFSC ; 522;
NOAA technical memorandum NMFS ; NOAA-TM-NMFS-SWFSC ; 522; Less -
Document Type:
Technical Memorandum ;
Place as Subject:
Klamath River (Or. and Calif.) ; California ; Trinity River ;
Klamath River (Or. and Calif.) ; California ; Trinity River ; Less -
Rights Information:
Public Domain
Main Document Checksum:
[+]
urn:sha256:60305b6bbbbf37fa1f8d90d5fa51f7d017c36d7db980168dade9ede1b4e1c4f8
File Type:

Supporting Files

• No Additional Files

More +