Abstract
ABSTRACT Survival and growth of the native oyster Crassostrea gasar along the juvenile and adult phases were evaluated in three different stocking densities [low (D), medium (2D) and high (3D)] and in two grow-out systems (fixed and floating system). The fixed system consisted of a rack made with PVC, fixed from the bottom with wood sticks. The floating system consisted of floating bags suspended by a rack made with PVC and maintained submerged from the seawater surface by eight floats. Survival and shell height of oysters cultured after 30, 60 and 90 days were registered in each phase and in each grow-out system. Results showed that the grow-out system did not affect survival and growth of C. gasar in the juvenile and adult phases. The tested densities affected the survival of oysters cultured over time in both phases but did not affect oyster growth. At times analyzed, it was observed positive growth in juvenile oysters grow after 90 days of culture. However, in the adult phase, no growth was observed after 90 days of culture. Oyster yield was higher in the density 3D, in both juvenile and adult phases. These findings contributed to the development of the oyster C. gasar culture.
Highlights
Oyster farming stood out in the world marine aquaculture with an approximated production of 5.9 million tonnes in 2018 (FAO, 2020a)
We evaluated the effect of different stocking densities on the growth and survival of C. gasar cultured in two different grow-out systems in Northern Brazil, tropical climate
Survival of juvenile oysters (Figure 2) in the fixed grow-out system ranged from 75.1± .6% at T90 to 95.1±2.4% at T30
Summary
Oyster farming stood out in the world marine aquaculture with an approximated production of 5.9 million tonnes in 2018 (FAO, 2020a). The genus Crassostrea is the most cultured worldwide, and represents 99.8% of total oyster production (FAO, 2020a). Brazil occupies the second position in the ranking of oyster production in Latin America (FAO, 2020b). The major produced species in Brazil is the Pacific oyster, Crassostrea gigas, with 2,759.6 tonnes in 2019 (EPAGRI, 2020). Crassostrea brasiliana) is the second most cultured species in Brazil. In other Brazilian States, as Maranhão, Rio Grande do Norte, Alagoas, Sergipe, Bahia, Espírito Santo, São Paulo and Paraná, available total production data do not discriminate C. gasar from other cultured oyster species
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