Details of the throw-trapping methodology and the efficiency for crayfish are described in Jordan et al. 1997 and Dorn et al. 2005, respectively. The dimensions of the throw traps are 1 square meter with a mesh size of 2 mm. Seven throws were randomly conducted at each sample plot within Shark River Slough and Taylor Slough, while five throws were conducted at each plot from the Water Conservation Areas. This gear type is ideal for sampling small-bodied fish and invertebrates in shallow, wetland habitats. Mean crayfish densities were assessed at the plot scale by taking the average of all throws at each plot.
Monitoring and modeling for the Everglades Depth Estimation Network (EDEN) are described in Telis 2006. The EDEN models estimate daily water depths using a grid-scale of 400x400m.
References:
Dorn, N. J., R. Urgelles, and J. C. Trexler. 2005. Evaluating active and passive sampling methods to quantify crayfish density in a freshwater marsh. Journal of the North American Benthological Society 24: 346-356.
Jordan, F., Coyne, S. and Trexler, J.C., 1997. Sampling fishes in vegetated habitats: effects of habitat structure on sampling characteristics of the 1‐m2 throw trap. Transactions of the American Fisheries Society, 126: 1012-1020.
Telis, P.A., 2006. The Everglades Depth Estimation Network (EDEN) for support of ecological and biological assessments (No. 2006-3087). US Geological Survey.