Growth and survival of the native oyster Crassostrea gasar cultured under different stocking densities in two grow-out systems in tropical climate

Macedo, A.R.G.; Sühnel, S.; Cordeiro, C.A.M.; Nunes, E.S.C.L.; Sousa, N.C.; Couto, M.V.S.; Lopes, E.M.; Pereira Junior, J.A.; Sampaio, D.S.; Legat, A.P.; Legat, J.F.A.; Paixão, P.E.G.; Fujimoto, R.Y.

doi:10.1590/1678-4162-12002

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Veterinary Medicine • Arq. Bras. Med. Vet. Zootec. 73 (04) • Jul-Aug 2021 • https://doi.org/10.1590/1678-4162-12002 copy

Growth and survival of the native oyster Crassostrea gasar cultured under different stocking densities in two grow-out systems in tropical climate

[Crescimento e sobrevivência da ostra nativa Crassostrea gasar cultivada em diferentes densidades em dois sistemas em clima tropical]

Authorship SCIMAGO INSTITUTIONS RANKINGS

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.

Keywords:
floating system; fixed system, native oyster; stocking density

Oyster life phase	Total experiment time (days)	Mesh size of bag (mm)	Oyster number per bag
			D	2D	3D
Juvenile	90	9	500	1000	1500
Adult	90	14	216	462	648

Phase	Data	Analyzed factor
Juvenile		Fixed	Floating
	Survival (%)	86.6±7.5^a	88.3±5.2^a
	Height (mm)	35.1±7.0^a	37.8±7.4^a
	Oyster yield (number)	849.4±323.4^a	872.1±341.8^a
		D	2D	3D
	Survival (%)	92.8±4.3^a	85.3±5.5^b	84.4±6.0^b
	Height (mm)	37.9±7.5^a	35.5±7.1^a	35.8±7.2^a
	Oyster yield (number)	464.1±21.5^a	852.9±55.0^b	1265.3±89.3^c
		T0	T30	T60	T90
	Survival (%)	-	92.6±3.1^a	86.4±5.4^b	83.4±6.7^b
	Height (mm)	22.5±0.1^a	27.5±2.1^b	37.9±3.9^b	43.8±2.2^c
	Oyster yield (number)	-	917.7±362.6^a	849.3±322.5^a	815.3±302.5^a
Adult		Fixed	Floating
	Survival (%)	94.8±3.0^a	95.9±2.4^a
	Height (mm)	41.0±3.2^a	42.5±2.9^a
	Oyster yield (number)	414.6±156.8^a	422.8±166.9^a
		D	2D	3D
	Survival (%)	96.9±2.2^a	96.2±1.5^a	93.0±2.8^b
	Height (mm)	42.9±2.5^a	41.1±2.5^a	41.3±3.9^a
	Oyster yield (number)	209.3±4.7^a	444.3±7.1^b	602.6±17.8^c
		T0	T30	T60	T90
	Survival (%)	-	97.2±2.4^a	95.3±2.1^b	93.6±2.6^b
	Height (mm)	43.8±2.3^a	40.4±2.9^a	40.9±3.6^a	41.9±2.5^a
	Oyster yield (number)		426.7±165.5^a	419.1±162.8^a	410.4±157.2^a

Universidade Federal de Minas Gerais, Escola de Veterinária Caixa Postal 567, 30123-970 Belo Horizonte MG - Brazil, Tel.: (55 31) 3409-2041, Tel.: (55 31) 3409-2042 - Belo Horizonte - MG - Brazil
E-mail: abmvz.artigo@gmail.com

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[1] *Autor para correspondência (corresponding author) E-mail: ssuhnel@gmail.com