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Article: An Index of Abundance for Coastal Species of Juvenile Sharks from the Northeast Gulf of Mexico.(Statistical Data Included)
- Article from:
- Marine Fisheries Review
- Article date:
- June 22, 1999
- Author:
CopyrightCOPYRIGHT 1999 U.S. Department of Commerce. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Introduction
In 1993, a Fishery Management Plan For Sharks (FMP) (NMFS, 1993) reported the abundance of many species of sharks, particularly large coastal species, could have declined by up to 75% from the 1970's to mid 1980's. To improve management and recovery of shark stocks, the FMP stressed the need for better estimates on the assessment and monitoring of shark populations. Prior to 1993, most estimators of shark stocks were derived using fishery-dependent indices which generally lacked a standardized statistical sampling design. The validity of an abundance estimator (i.e. indices of abundance) depends on its accuracy and precision, and its robustness (the ...