Aspects of the population dynamics of Anomalocardia brasiliana: subsidies for sustainable fishing in the west coast of Ceará, Brazil
DOI:
https://doi.org/10.1590/1809-6891v23e-72781EAbstract
Shellfish is an artisanal activity and family subsistence way of the coastal communities. Being the Anomalocardia brasiliana is one of the main mollusc species exploited. This paper aims to obtain information about the temporal distribution, growth, yield and the gonadosomatic index of the bivalve mollusc A. brasiliana in a natural bank in order to provide subsidies for the sustainable extraction of this resource. The present study was carried out in an area of the Acaraú River estuary, in Volta do Rio Beach, in Acaraú city. Samples were collected monthly during a year at spring low tide, using the random squares method. The temperature of the water, the sediment and the salinity were measured in situ. Sediment samples were collected for granulometric analysis. The specimens were quantified, measured and weighed individually. A total of 8,507 specimens of A. brasiliana were sampled, the highest density recorded was 2,534 individuals/m², those with the longest shell length were between 21 and 25 mm, the meat yield presented an average value of 12.42%. The means of the biometric variables of the individuals presented significant differences during the sample period. Frequency histograms evidenced the presence of adult individuals, in the process of sexual and juvenile differentiation, indicating a continuous reproductive cycle in the natural stock studied. These results will aid in the sustainable shellfish exercise on the Volta do Rio beach. It recommended the capture of A. brasiliana with length above 20 mm and the reduction of the capture effort in the months of April to September, when the highest density of juveniles was observed, in order to maintain the sustainability of this stock.
Keywords: Shellfish; Fishing Resource; Fisheries Regulations.
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