Oocyte size, a means to evaluate the gametogenic development of the Pacific oyster, Crassostrea gigas (Thunberg)

Lango-Reynoso, Fabiola; Chávez‐Villalba, Jorge; Cochard, Jean-Claude; Pennec, Marcel Le

doi:10.1016/s0044-8486(00)00392-6

Cited by 120 publications

(84 citation statements)

References 19 publications

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“…Likewise, such understanding can be valuable for identifying the best period for obtaining mature breeders from the natural stocks so that seeds can be produced in the laboratory. The reproductive cycle of the oyster Crassostrea gigas while living in the natural environment has been well described (Mann, 1979;Perdue et al, 1981;Dinamani, 1987;Ruiz et al, 1992;Steele and Mulcahy, 1999;Lango-Reynoso et al, 2000;Li et al, 2000;Chávez-Villalba et al, 2001;Lango-Reynoso et al, 2006;Normand et al, 2008).…”

Section: Introductionmentioning

confidence: 95%

The reproductive cycle of the oyster Crassostrea gasar

et al. 2014

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The purpose of this study was to analyze the reproductive cycle of the oyster Crassostrea gasar (= C. brasiliana) in the field and the laboratory. The reproductive cycle of the animals was evaluated in the field at Sambaqui Beach, Florianópolis, SC (27° 29'18" S and 48° 32'12" W) from May 2008 through November 2009. In July, the animals were in the resting stage. The early growth stage began in August and was followed by the late growth stage in October. In November and December, the oysters began to enter the mature stage. Females in spawning condition were predominant during these months. The stages of the reproductive cycle were positively associated with temperature (r=0.77, P<0.01) and negatively associated with salinity (r=-0.56, P=0.042). These findings demonstrated that increased temperature and reduced salinity influence the reproductive development of Crassostrea gasar. The condition index (CI) of the animals was also associated with the seawater temperature. The highest values of the condition index were observed during the months when the temperature of the seawater was gradually increasing. A laboratory experiment was performed to test the effect of salinity on the reproductive cycle of the oysters. The experiment was conducted in standardized tanks. The animals were conditioned using two salinities (24‰ and 34‰). The salinity regime influenced the development of the gonadal tissue of the oysters. A salinity of 24‰ produced greater reproductive development.Keywords: oysters, reproductive cycle, Crassostrea gasar, conditioning. Ciclo reprodutivo da ostra Crassostrea gasar ResumoO presente estudo teve como objetivo avaliar o ciclo reprodutivo da ostra Crassostrea gasar, em campo e em laboratório. O estádio de desenvolvimento do ciclo reprodutivo dos animais foi acompanhado na Praia do Sambaqui/Florianópolis/ SC (27°29'18"S e 48°32'12"W) entre maio de 2008 e novembro de 2009. No mês de julho os animais encontravamse no estádio de repouso e entre os meses de agosto a outubro, as ostras seguiram nos estádios de pré-maturação e maturação. Entre os meses de novembro e dezembro, as ostras começaram a ser encontradas no estádio maturo, havendo predominância de fêmeas aptas a eliminação de gametas. Houve associação positiva (r=0,77; P<0,01) entre o estádio de desenvolvimento do ciclo reprodutivo das ostras e a temperatura, bem como associação negativa com a salinidade (r=-0,56; P=0,042), demonstrando que tanto o aumento da temperatura como a redução da salinidade são fatores ambientais que influenciam no desenvolvimento reprodutivo das ostras dessa espécie. O índice de condição (IC) dos animais, também teve relação com a temperatura da água do mar, sendo os maiores índices observados nos meses em que a temperatura da água do mar teve aumento gradativo. Também foi realizado um experimento em laboratório visando testar o efeito da salinidade da água sobre o desenvolvimento reprodutivo das ostras. Para tanto, os animais foram condicionados em tanques padronizados e testaram-se duas salinidades (24‰ e 3...

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Section: Introductionmentioning

confidence: 95%

The reproductive cycle of the oyster Crassostrea gasar

et al. 2014

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“…Planimetry has been widely used in the measurement of different dimensional variables such as length and area in various marine organisms (De Pontual et al 1985, Morales-Alamo & Mann 1987, Heffernan & Walker 1989, Kang et al 2003. In particular, computer-based planimetric techniques that analyze digitized images have proven to be prompt and objective in the processing of large quantities of image data (De Pontual et al 1985, Lango-Reynoso et al 2000, Kang et al 2003. Most studies measuring the skeletal growth of sea urchins have used length parameters such as radius and TD (Duineveld & Jenness 1984, David 1987, Freire et al 1992, Hong & Chung 1998, Branchard & Feder 2000.…”

Section: Discussionmentioning

confidence: 99%

Use of plate growth measurement for the estimation of skeletal growth of two sand dollars, Astriclypeus manni (Verrill 1867) and Clypeaster japonicus (D^|^ouml;derlein 1885), in Jeju, Korea

Kang

Yang²,

Park

et al. 2007

Plankton Benthos Res

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“…De cada hembra se tomaron entre 5 a 10 imágenes digitales para así disponer de al menos 100 ovocitos por almeja para mediciones futuras. Sólo los ovocitos que presentaron una vesícula germinal bien definida, se les midió la superficie (pixeles) usando el software Sigma Scan Pro 5.0® y con ella se estimó el diámetro teórico (en μm) mediante la relación propuesta por Lango-Reynoso et al (2000):…”

Section: Medición De Ovocitosunclassified

“…Para determinar las fases reproductivas de las hembras y machos de C. fluctifraga, se usaron como referencia los mismos criterios de clasificación (diámetro de ovocitos y análisis modal para hembras, y porcentaje de llenado de los folículos en machos) que en las escalas de reproducción propuestas por Lango-Reynoso et al (2000) y Chávez-Villalba et al (2002) para Crassostrea gigas. La prueba de Chi cuadrado se usó para determinar la bondad de ajuste de las proporciones sexuales con la relación esperada de 1:1.…”

Section: Fases Reproductivas Y Proporción De Sexosunclassified

“…Para evitar este problema algunos autores señalan la importancia de combinar metodologías para obtener información cuantitativa, además de la cualitativa (Metaxatos 2004, Moura et al 2008, Oyarzún-Cabañas et al 2010. Entre los métodos cuantitativos más utilizados se encuentran el conteo y medición de los ovocitos (Muranaka & Lannan 1984, Lango-Reynoso et al 2000, así como el cálculo de áreas de la gónada (Heffernan & Walker 1989, Enríquez-Díaz et al 2009). Existen estudios donde los métodos anteriores se complementan analizando la distribución de las frecuencias de los diámetros de los ovocitos para conocer la evolución de las cohortes ovocitarias en el tiempo (Morvan & Ansell 1988, LangoReynoso et al 2006, Hmida et al 2010.…”

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Ciclo gametogénico e índice de condición de la almeja Chione fluctifraga en Bahía San Jorge, Golfo de California, México

Castillo-Durán

Castro-Acedo

Arreola-Lizárraga

et al. 2013

Rev. biol. mar. oceanogr.

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28°C). Gametogenic activity seemed to be strongly regulated by water temperature. The average growth rate of oocyte cohorts was calculated (0.41 ± 0.10 µm day_1), with the most rapid growth (0.67 µm day_1) from September through October. The condition index was higher in summer, but other peaks occurred in winter, producing accumulation of nutrients from increased phytoplankton biomass. The female:male ratio was 1:1.3; no hermaphrodites were detected. A reproductive classification is proposed. These results can help regulate exploitation and establish off-limit periods for this clam in the Gulf of California.]]>

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Oocyte size, a means to evaluate the gametogenic development of the Pacific oyster, Crassostrea gigas (Thunberg)

Cited by 120 publications

References 19 publications

The reproductive cycle of the oyster Crassostrea gasar

The reproductive cycle of the oyster Crassostrea gasar

Use of plate growth measurement for the estimation of skeletal growth of two sand dollars, Astriclypeus manni (Verrill 1867) and Clypeaster japonicus (D^|^ouml;derlein 1885), in Jeju, Korea

Ciclo gametogénico e índice de condición de la almeja Chione fluctifraga en Bahía San Jorge, Golfo de California, México

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