Author: Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 12
Book Description
Southeast Fisheries Center
Author: Our Living Oceans
Author: Monthly Catalog of United States Government Publications
Author: Marine Fisheries Review
Author: Special Scientific Report
Author: Sampling Statistics in the Atlantic Menhaden Fishery
Author: Alexander J. ChesterPublisher:
ISBN:
Category : Atlantic menhaden
Languages : en
Pages : 464
Book Description
Atlantic menhaden, Brevootia tyrannus, the object of a major purse-seine fishery along the U.S. east coast, are landed at plants from northern Florida to central Maine. The National Marine Fisheries Service has sampled these landings since 1955 for length, weight, and age. Together with records of landings at each plant, the samples are used to estimate numbers of fish landed at each age. This report analyzes the sampling design in terms of probability sampling theory. The design is classified as two-stage cluster sampling, the first stage consisting of purse-seine sets randomly selected from the population of all sets landed, and the second state consisting of fish randomly selected from each sample set. Implicit assumptions of this design are discussed with special attention to current sampling procedures. Methods are developed for estimating mean fish weight, numbers of fish landed, and age composition of the catch, with approximate 95% confidence intervals. Based on specific results from three ports (Port Monmouth, N.J., Reedville, Va., and Beaufort, N.C.) for the 1979 fishing season, recommendations are made for improving sampling procedures to comply more exactly with assumptions of the sampling design. These recommendations include adopting more formal methods for randomizing set and fish selection, increasing the number of sets sampled, considering the bias introduced by unequal set sizes, and developing methods to optimize the use of funds and personnel.
Accessions List
Author: Environmental Science Information Center. Library and Information Services DivisionPublisher:
ISBN:
Category : Ecology
Languages : en
Pages : 22
Book Description
Accessions List
Author: Assessment and Information Services Center (U.S.). Library and Information Services DivisionPublisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 606
Book Description
Accessions List
Author: United States. National Environmental Satellite, Data, and Information Service. Library and Information Services DivisionPublisher:
ISBN:
Category :
Languages : en
Pages : 606
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 748
Book Description