Elements of reproductive strategy in oysters,<i>Crassostrea gigas</i>, from the “Rade de Brest”, France

Lango-Reynoso, Fabiola; Devauchelle, Nicole; Pennec, Marcel Le; Hatt, Philippe-Jacques

doi:10.1080/07924259.1999.9652690

Cited by 17 publications

(16 citation statements)

References 4 publications

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“…The major reproductive activity occurred in September, with 77% mature oocytes in the gonad: yet, the condition index for the same period represented less than half (42%) the maximum (96%). Lango‐Reynoso (1999) did not find a direct relationship between oocyte diameter and condition index of three C. gigas populations in France.…”

Section: Discussionmentioning

confidence: 58%

“…This is attributable to the little presence of atretic oocytes in the histological preparations and because, starting in October, the oysters were only in the undifferentiated phase or males in the early gametogenesis stage. In France, in populations of Pacific oysters, female specimens diminish rapidly and disappear from September to February (Lango‐Reynoso 1999).…”

Section: Discussionmentioning

confidence: 99%

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Reproduction, condition and mortality of the Pacific oysterCrassostrea gigas(Thunberg) in Sonora, México

Chávez‐Villalba

Villelas-Ávila

Cáceres-Martínez

2007

Aquaculture Research

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Starting in 1997, mortality outbreaks in cultured oysters Crassostrea gigas have been reported in northwestern México. Previous studies have shown that massive die‐offs result from multi‐factor processes related to reproduction of the species. We studied the reproductive cycle and the condition index of cultured oysters in the coastal lagoon of El Soldado, Sonora, as well as the relationship of the life cycle with environmental parameters. We used oocyte diameter to determine reproductive stages and the condition index to describe the physiological state of oysters. Additionally, the temperature, salinity, seston and chlorophyll a were recorded at the study site. The results showed that C. gigas began accelerated reproductive activity in March under the influence of high temperature and increased concentrations of food. No spawning events were recorded and gametes were reabsorbed within the gonad in September and October. The results showed a period of nutrient storage during autumn–winter and another period of gamete production in spring–summer. A mortality event occurred at the end of winter, tied to significant increases in temperature and availability of food and in accelerated reproductive activity and high condition index. These conditions were very similar to those reported in other countries during summer die‐offs of C. gigas.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Reproduction, condition and mortality of the Pacific oysterCrassostrea gigas(Thunberg) in Sonora, México

Chávez‐Villalba

Villelas-Ávila

Cáceres-Martínez

2007

Aquaculture Research

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“…The sex ratio among the groups, which exhibited a predominance of females over the other classes, was also observed in other species of the genus Crassostrea by other researchers including Lenz (), in C. rhizophorae from Camamu (Bahia, BA) by Lenz and Boehs (), in C. rhizophorae from Guaratuba Bay by Christo (), in Crassostrea gigas from France by Lango‐Reynoso et al . () and in C. gigas from Korea by Lee et al . ().…”

Section: Discussionmentioning

confidence: 94%

“…; Lango‐Reynoso et al . ). The effects of maternal and paternal variables on the sexual maturation and spawning period were also suggested by Guo et al .…”

Section: Discussionmentioning

confidence: 97%

Gonad morphology and reproductive cycle of the mangrove oyster Crassostrea brasiliana (Lamarck, 1819) in the baía de Guaratuba, Paraná, Brazil

2013

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This study aimed to describe the gonadal histology and the reproductive cycle of Crassostrea brasiliana in the mangroves of Guaratuba Bay in southern Brazil. Adults were collected monthly from January 2010 to April 2011 from three sampling sites in intertidal oyster beds. The animals were evaluated using biometric and histological analyses of the gonads. The gonadal tissue samples were processed according to the standard histological procedures, and permanent slides were prepared using Harris' haematoxylin and eosin. The oysters were identified at the species level using a molecular protocol. Females (69%) predominated over males (26%), with 4% indeterminate and 1% hermaphroditic. Mature females were more prevalent in February, March and December 2010 and in March 2011. Mature males were more prevalent in February and April 2010 and in March 2011. The presence of hermaphroditic individuals was sporadic, and oysters in immature stages or sexual repose were observed in only a few collections between the months of May and October 2010. The reproduction of C. brasiliana in Guaratuba Bay occurs intermittently, but with greater intensity during the summer, with a larger number of females produced.

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“…Although growth and gametogenesis in particular also impact respiration rates, this effect was not observed in this study. The adult respiration rates were the same in June and October at different gametogenesis stages: in June more than 70% of the population was mature, while the entire population had spawned in October (oyster farmer observations for 2007 and Lango- Reynoso et al (1999Reynoso et al ( , 2000 for previous years). Temperature is probably the most important factor controlling respiration rates.…”

Section: Respirationmentioning

confidence: 98%

Respiration and Calcification of Crassostrea gigas: Contribution of an Intertidal Invasive Species to Coastal Ecosystem CO2 Fluxes

Lejart

Clavier

Chauvaud

et al. 2011

Estuaries and Coasts

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International audienceRespiration and calcification rates of the Pacific oyster Crassostrea gigas were measured in a laboratory experiment in the air and underwater, accounting for seasonal variations and individual size, to estimate the effects of this exotic species on annual carbon budgets in the Bay of Brest, France. Respiration and calcification rates changed significantly with season and size. Mean underwater respiration rates, deducted from changes in dissolved inorganic carbon (DIC), were 11.4 μmol DIC g−1 ash-free dry weight (AFDW) h−1 (standard deviation (SD), 4.6) and 32.3 μmol DIC g−1 AFDW h−1 (SD 4.1) for adults (80-110 mm shell length) and juveniles (30-60 mm), respectively. The mean daily contribution of C. gigas underwater respiration (with 14 h per day of immersion on average) to DIC averaged over the Bay of Brest population was 7.0 mmol DIC m−2 day−1 (SD 8.1). Mean aerial CO2 respiration rate, estimated using an infrared gas analyzer, was 0.7 μmol CO2 g−1 AFDW h−1 (SD 0.1) for adults and 1.1 μmol CO2 g−1 AFDW h−1 (SD 0.2) for juveniles, corresponding to a mean daily contribution of 0.4 mmol CO2 m−2 day−1 (SD 0.50) averaged over the Bay of Brest population (with 10 h per day of emersion on average). Mean CaCO3 uptake rates for adults and juveniles were 4.5 μmol CaCO3 g−1 AFDW h−1 (SD 1.7) and 46.9 μmol CaCO3 g−1 AFDW h−1 (SD 29.2), respectively. The mean daily contribution of net calcification in the Bay of Brest C. gigas population to CO2 fluxes during immersion was estimated to be 2.5 mmol CO2 m−2 day−1 (SD 2.9). Total carbon release by this C. gigas population was 39 g C m−2 year−1 and reached 334 g C m−2 year−1 for densely colonized areas with relative contributions by underwater respiration, net calcification, and aerial respiration of 71%, 25%, and 4%, respectively. These observations emphasize the substantial influence of this invasive species on the carbon cycle, including biogenic carbonate production, in coastal ecosystems

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Elements of reproductive strategy in oysters,Crassostrea gigas, from the “Rade de Brest”, France

Cited by 17 publications

References 4 publications

Reproduction, condition and mortality of the Pacific oysterCrassostrea gigas(Thunberg) in Sonora, México

Reproduction, condition and mortality of the Pacific oysterCrassostrea gigas(Thunberg) in Sonora, México

Gonad morphology and reproductive cycle of the mangrove oyster Crassostrea brasiliana (Lamarck, 1819) in the baía de Guaratuba, Paraná, Brazil

Respiration and Calcification of Crassostrea gigas: Contribution of an Intertidal Invasive Species to Coastal Ecosystem CO2 Fluxes

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