In May 2010, an expedition on the research vessel Akademik Oparin explored the populations of the clam Tridacna crocea on reefs of the Bay Canh and Cau islands of the Cön Dao Archipelago in the South China Sea. A retrospective approach using phototechniques revealed a great similarity of the vertical distribution, growth, size, and age composition of the tridacna at these islands. The maximum density of tridacna (25 ind/m2) was characteristic of a depth of about 3 m in the area of reef flat transition to reef slope. The growth of clams can be approximated by a Bertalanffy-type equation: L t = 133.8[1 − e −0.1181(t − 0.2596)]. The lack of discreteness in the size and age compositions of populations of T. crocea indicated that population recruitment was quite stable over the years. This tends to maintain the population in a relatively stable condition, which enabled us to consider it as a possible reserve for the artificial restoration of populations of the species in impoverished coastal areas of Vietnam.
Russian Journal of Marine Biology – Springer Journals
Published: Nov 9, 2011
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