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Thesis
KING MACKEREL POPULATION DYNAMICS AND STOCK MIXING IN THE UNITED STATES ATLANTIC OCEAN AND GULF OF MEXICO
University of West Florida
Master of Science (MS), University of West Florida
2008
Abstract
Atlantic Ocean (Atlantic) and Gulf of Mexico king mackerel, Scomberomorus cavalla, populations are genetically distinct but have overlapping winter ranges around south Florida. This study was designed to estimate growth functions for each population using fishery-dependent and -independent data, and to evaluate spatial and temporal variability in the Atlantic population’s contribution to mixed-stock winter landings in 2006/07 and 2007/08. Estimated von Bertalanffy growth functions were significantly different between sexes and populations (2, p<0.01). Analysis of otolith shape and stable isotope (d13C and d18O) chemistry in summer-sampled king mackerel revealed significant sex and stock effects (MANOVA, p<0.001). Discriminant function analysis conducted with otolith shape or stable isotope ratios as classification variables produced average stock-specific jackknifed classification success rates of 65.8% and 79.3%, respectively. Maximum likelihood estimates from otolith shape- and stable isotope-based models of the Atlantic population’s contribution to mixed-stock winter landings among three south Florida winter sampling zones indicated a spatial gradient existed, with the lowest Atlantic contribution off southwest Florida and the highest off southeast Florida. Monthly estimates of Atlantic contribution to the eastern-most zone increased from December through March, possibly reflecting the northward spring migration of both populations.
Details
- Title
- KING MACKEREL POPULATION DYNAMICS AND STOCK MIXING IN THE UNITED STATES ATLANTIC OCEAN AND GULF OF MEXICO
- Resource Type
- Thesis
- Publisher
- University of West Florida
- Format
- text
- Identifiers
- 99380090753606600
- Academic Unit
- Biology
- Language
- English
- Awarding Institution
- University of West Florida; Master of Science (MS)
- Theses and Dissertations
- Master of Science (MS), University of West Florida