Seasonal Comparison of Catch Rates and Size Structure Using Three Gear Types to Sample Sturgeon in the Middle Mississippi River

Autor:	Valerie A. Barko, Ronald C. Brooks, David E. Ostendorf, Sara J. Tripp, David P. Herzog, James E. Garvey, Quinton E. Phelps, Joseph W. Ridings, Robert E. Colombo, Robert A. Hrabik
Rok vydání:	2009
Předmět:	Ecology Sample (statistics) Management Monitoring Policy and Law Aquatic Science Catch per unit effort Biology biology.organism_classification Fishery Sturgeon Scaphirhynchus platorynchus Habitat Sample size determination Acipenser Lake sturgeon Ecology Evolution Behavior and Systematics
Zdroj:	North American Journal of Fisheries Management. 29:1487-1495
ISSN:	1548-8675 0275-5947
Popis:	We evaluated the efficacy of three gears commonly used to sample shovelnose sturgeon Scaphirhynchus platorynchus, pallid sturgeon S. albus, and lake sturgeon Acipenser fulvescens in large rivers. We stratified habitats and randomly sampled sites with trawls, gill nets, and trotlines in the middle Mississippi River from June 2003 through May 2005 (N = 3,476 samples). A total of 3,523 shovelnose sturgeon, 31 pallid sturgeon, and 13 lake sturgeon were captured. When sample sizes were adequate (based on power analysis), we used a mixed analysis of variance (ANOVA) procedure to determine the relative impact of season and gear type on sturgeon catch per unit effort (CPUE). Kolmogorov–Smirnov tests were used to determine whether the length frequency distributions for each species differed among gears. Overall, the power analyses indicated that there were adequate sample sizes for comparing standardized CPUE for shovelnose sturgeon among seasons; however, too few pallid or lake sturgeon were collected to...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::470d136c5bcb7dfb704a35bb702929a2 https://doi.org/10.1577/m08-134.1 Zobrazit plný text záznamu Plný text