The objective of this research was to characterize the granulometric parameters of the sediments of Barreta beach, geographically located on the east coast of the Brazilian state of Rio Grande do Norte, this beach stands out for the presence of beach sandstones, which play an important role in the morphology of the region. These granulometric parameters were studied through morphoscopy, and the determination of the calcium carbonate content and the content of total organic matter in 10 samples collected in the dune and in the intertidal zone. This beach is dominated by medium-sized, well-selected, and moderately selected sediments, with approximately symmetrical and mesokurtic sand-grain size distributions. Morphoscopic analysis showed a predominance of angular to subangular sand-grains (64%) in the samples, also a high degree of sphericity (59 - 78%).
We estimated morphometric relationships for four shrimp species (Exhippolysmata oplophoroides, Nematopalaemon schmitti, Rimapenaeus constrictus, and Sicyonia dorsalis) caught as bycatch by the shrimp fishery in Sergipe, northeastern Brazil.Allometry in growth differed among species.
