Resumen del producto

In order to explore the potential strategy of rotating fishing areas for the black ark or pustulose Anadara tuberculosa (Sowerby, 1833), an experiment to estimate density recovery after intensive fishing was performed in two mangrove swamps, “El Conchalito” and “El Mogote”, at Ensenada de La Paz, Mexico. On each swamp, one fishing and one repopulation areas were delimited. Black ark density (individuals/m²) on each area was estimated on October-November 2010 and, from February 2011 through April 2013, seven samples were done in each zone to record ark densities and size of individuals. Average density at “El Conchalito” was 1.05 ind. m^-2 (± 0.21 s.d.) with a minimum of 0.70 ind. m^-2 and a maximum of 1.30 ind. m^-2 . The effect of fishing was clearly observed during the first and second bimonthly period with densities was 0.93 ind. m^-2, but recovery to near the initial density level (1.3 ind. m^-2) took seven months. At “El Mogote”, average density was 1.52 ind/m² (±0.71 s.d.), with a minimum of 0.76 ind. m^-2 and a maximum of 2.52 ind. m^-2. The effect of fishing was also evident with values was 0.8 ind. m^-2 in the following ten months; recovery of initial density levels (around 2.0 ind. m^-2) took eighteen months. At the repopulation areas, densities increased from 0.83 to 1.32 ind. m^-2 in “El Conchalito” and, ranged from 1.0 to 3.0 ind. m^-2 in “El Mogote”. Length frequency analyses of black ark showed a decrease in the number of large individuals and the recruitment of smaller ones during the winter months. However, the cause of this is not well understood as black ark reproduction and recruitment behavior is not well known.

Palabras clave: Repopulation; black ark; Anadara tuberculosa; densities

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