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To measure secondary productivity of mangrove systems, we estimated the abundance (individuals m^-2) and mass increment (g month^-1) of the two bivalve species are the black ark Anadara tuberculosa and palmate oyster Saccostrea palmula. Mass increments were based on individual growth rates derived from length frequency distributions analyses. Samples were collected at three mangrove estuaries in a sand barrier at Ensenada de La Paz, from August 2007 to July 2009. The average abundance was 1.27 ind m^-2 for black ark and 510 ind m^-2 for palmate oysters. Growth rates was 3.67 g month^-1 for black arks and 0.18 g month^-1 for palmate oysters were estimated. The average secondary productivity of the black ark was 4.51 g m^-2 month^-1and peaked during the spring, while for the mangrove oyster it was 97.9 g m^-2 month^-1, with peak productivity recorded during the summer. The findings of this investigation constitute a necessary element for establishing a baseline to evaluate the consequences of the various natural and anthropogenic pressures that the mangrove systems of El Mogote of La Paz Bay B.C.S., Mexico.

Palabras clave: Saccostrea; production; Anadara; Gulf of California; bivalves

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