Spatial variation of the abundance of the soft-bottom fauna on the continental shelf off Jalisco and Colima, Mexico (spring 1995)

Spatial distribution of the abundance of the soft-bottom fauna on the continental shelf off Jalisco and Colima (Pacific coast of Mexico) was investigated. Samples were taken at seven sites with mean depths of 20, 40, 60 and 80 m during May and June 1995. Abundance indexes are given as number of individuals and total weight per unit of area swept in the hectares. The values obtained showed a very high variance, with ranges from 30 to 1,952 ind/ha and 0.6 to 110.3 Kg/ha for the fish, and from 121 to 6,536 ind/ha and 1.0 to 64.5 Kg/ha for the invertebrates.