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Growth rates of the introduced topshell Trochus niloticus on Guam, Mariana Islands, were studied with a mark and recapture method. Although growth rates of individuals varied considerably, a negative correlation was found between growth rate and initial shell diameter. The von
Bertalanffy growth model parameters k and L∞ were calculated on the basis of 322 recaptures. Spatial distribution and abundance of T. niloticus were surveyed at sites characterized by wide reef flats, narrow reef flats, and limestone benches. Low densities of topshells
were found on windward reefs, and leeward reefs supported greater densities. Distinct zonation of size classes of topshells was found for the outer reef flat, reef margin, 6-m contour, and 12-m contour. The size distribution of T. niloticus appears to be related to reef topography.
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.