Progress Toward Modeling Tagging Data to Investigate Spatial and Temporal Changes in Habitat Utilization of Yellowtail Flounder on the Grand Bank.

In November 2003 a bottom tending oceanographic mooring was released by NAFC on the southern Grand Bank in NAFO Division 3N. The mooring instrumentation consisted of a tidal gauge, a current meter and six electroni c data storage tags and collect ed data for one year. In June 2003, captured yellowtail flounder where released on the Grand Bank with either Pet ersen disc or elect ronic dat a storage tags attached as part of a 5-year t agging project begun in 2000. The analysis of tag returns for yellowtail flounder on the Grand Bank was restricted to the period June 2003 to November 2004. The analysis of movements based on Peterson disc tags show yellowtail movements are generally southward from their rel ease site. Seasonal analysis of movements including off-bottom vertical excursions were investigated in relation to oceanographic data. The data storage tagging data indicated that adult yellowtail flounder over the Grand Bank of Newfoundland undergo distinct off-bottom vertical migrations during the nighttime which may be associated with high tides. This paper summaries preliminary model results. Introduction Mark-recapture studies can be used to estimate abundance of fish by using recaptures of the t agged fish to estimate the exploitation rat e together with total landings in the fishery. These studies can also be used to estimate movements, growth, and selectivity. Tagging yellowtail flounder with traditional techniques, i.e. Petersen discs, can provide information on movements but may underestimate their true ext ent. Recent el ectronic data storage tagging (DSTs) studies of North Sea plai ce used measurements of depth and temperature to reconstruct the tracks of plaice movements (Metcal fe and Arnold, 1997). It was discovered that the rat es of movements are often t en times faster and farther than those deduced from conventional mark-recapture experiments. In the winter of 2000, the Northwest Atlantic Fisheries Centre (NAFC) and Fishery Products International Ltd, of St. John's entered into a co-operative program to begin a 5-year tagging program on Grand Bank yellowtail flounder using traditional Petersen discs in a mark-recapture study. Archival dat a storage tags were also used to speci fically investigate vertical and horizontal movements at a finer scale of resolution. The objectives of this extensive tagging program was to estimate exploitation rates, growth rates, mortality, movements and to provide an additional estimate of population size. In November 2003 we deployed an oceanographic mooring for one year on the Grand Bank to measure real time tidal data and oceanographic parameters such as temperature and depth (see Han et. al., 2006 for details) at a fixed

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