Morphology of the larval shell of three oyster species of the genus Crassostrea Sacco, 1897 (Bivalvia: Ostreidae)

Christo, Susete Wambier; Absher, Theresinha Monteiro; Boehs, Guisla

doi:10.1590/s1519-69842010000300023

Cited by 15 publications

(8 citation statements)

References 8 publications

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“…At the same time, the larvae were classified according to different developmental stages and their numbers were recorded. The developmental stages were identified using the shell morphology and the presence of D-shaped, early umbo, late umbo and pediveliger stages with eyespots [47]. All of the shells were then photographed at a 63×magnification.…”

Section: Methodsmentioning

confidence: 99%

Larval and Post-Larval Stages of Pacific Oyster (Crassostrea gigas) Are Resistant to Elevated CO2

et al. 2013

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The average pH of surface oceans has decreased by 0.1 unit since industrialization and is expected to decrease by another 0.3–0.7 units before the year 2300 due to the absorption of anthropogenic CO2. This human-caused pH change is posing serious threats and challenges to the Pacific oyster (Crassostrea gigas), especially to their larval stages. Our knowledge of the effect of reduced pH on C. gigas larvae presently relies presumptively on four short-term (<4 days) survival and growth studies. Using multiple physiological measurements and life stages, the effects of long-term (40 days) exposure to pH 8.1, 7.7 and 7.4 on larval shell growth, metamorphosis, respiration and filtration rates at the time of metamorphosis, along with the juvenile shell growth and structure of the C. gigas, were examined in this study. The mean survival and growth rates were not affected by pH. The metabolic, feeding and metamorphosis rates of pediveliger larvae were similar, between pH 8.1 and 7.7. The pediveligers at pH 7.4 showed reduced weight-specific metabolic and filtration rates, yet were able to sustain a more rapid post-settlement growth rate. However, no evidence suggested that low pH treatments resulted in alterations to the shell ultrastructures (SEM images) or elemental compositions (i.e., Mg/Ca and Sr/Ca ratios). Thus, larval and post-larval forms of the C. gigas in the Yellow Sea are probably resistant to elevated CO2 and decreased near-future pH scenarios. The pre-adapted ability to resist a wide range of decreased pH may provide C. gigas with the necessary tolerance to withstand rapid pH changes over the coming century.

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Section: Methodsmentioning

confidence: 99%

Larval and Post-Larval Stages of Pacific Oyster (Crassostrea gigas) Are Resistant to Elevated CO2

et al. 2013

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“…Las ostras son moluscos bivalvos, pertenecientes a la familia Ostreidae, y presentan una amplia distribución geográfica (Christo et al, 2010). La ostra del Pacífico o japonesa, Cassostrea gigas (Thunberg, 1793), se desarrolla habitualmente en fondos firmes, rocas o cualquier tipo de sustrato firme en zonas costeras de aguas someras o estuarios.…”

Section: Introductionunclassified

Cambios organolépticos inducidos en la ostra japonesa Crassostrea gigas con dietas de las microalgas Thalassiosira pseudonana y Tetraselmis suecica

2020

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El cultivo de ostras, particularmente de la ostra japonesa Crassostrea gigas, en el Ecuador, se muestra como una alternativa para diversificar su producción acuícola. Una manera de dar valor agregado a los moluscos bivalvos es modificar sus propiedades organolépticas o refinamiento, alimentándolos con densidades altas de microalgas. En el presente estudio, un grupo de panelistas degustadores entrenados evaluaron el impacto organoléptico de ostras Crassostrea gigas, proveniente de un cultivo en suspensión, refinándolas con las microalgas Thalassiosira pseuodonana y Tetraselmis suecica, y un grupo control mantenido en el mar, durante un periodo de 3 semanas. Transcurrida la primera semana, se evidenciaron diferencias significativas en cuanto a los 2 tratamientos y el control, las cuales se mantuvieron hasta la tercera semana. Los evaluadores pudieron discriminar las ostras alimentadas con T. pseudonana, atribuyéndoles un sabor más dulce, aroma a pescado fresco y un grado de aceptación superior. Tetratselmis suecica se caracterizó por un sabor y olor a algas; mientras que el grupo control no presentó una característica netamente definida en cuanto a sabor y olor, pero si una menor aceptación. Se concluye que una dieta especifica de microalgas aplicada por una semana, causa efectos de mayor aceptación sobre las propiedades organolépticas, tanto en sabor como en olor de las ostras, pudiendo generarles valor agregado.

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“…Oysters have great economic importance (Christo et al 2010) and are consumed by people because of its good taste and high protein content (Ruesink et al 2005). Oyster has been a source of livelihood for Aceh people for a long time.…”

Section: Introductionmentioning

confidence: 99%

Morphogenetic and population structure of two species marine bivalve (Ostreidae: Saccostrea cucullata and Crassostrea iredalei) in Aceh, Indonesia

2018

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Ramadhaniaty M, Setyobudiandi I, Madduppa HH. 2018. Morphogenetic and population structure of two species marine bivalve (Ostreidae: Saccostrea cucullata and Crassostrea iredalei) in Aceh, Indonesia. Biodiversitas 19: 978-988. Oysters (Family Ostreidae) are mollusks, with high levels of phenotypic plasticity and wide geographic distribution. Oysters are a challenging group for morphological identification and genetic populations study. Saccostrea cucullata and Crassostrea iredalei are oysters from bivalve class that lives in the intertidal area and mangrove ecosystem. To clarify the morphology, genetic diversity and population structure of the two forms of S. cucullata and C. iredalei, we collected and studied oysters from three locations along the coastal region of Aceh by using morphometric method and 16 S mtDNA sequences analysis. We also added more oysters sequences from China, Japan, and Thailand to determine the connectivity between all populations. Morphometric characteristics of the oyster showed a negative allometric growth pattern, which means the rate of length gain is faster than that of the weight gain. The genetic distance from S. cucullata was 0.0030.004 (Fst = 0.708) and C. iredalei was 0.000 (Fst = 0.971). The long genetic distance and high fixation index (Fst) in the oysters population are caused by the close geographical distance of the species in the three populations. The haplotype diversity value from S. cucullata and C. iredalei were 20 and 3, respectively. The haplotype showed the connectivity among the oyster populations which indicated by the gene flow pattern. The gene flow was affected by geographical distance and environmental complexity.

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Morphology of the larval shell of three oyster species of the genus Crassostrea Sacco, 1897 (Bivalvia: Ostreidae)

Cited by 15 publications

References 8 publications

Larval and Post-Larval Stages of Pacific Oyster (Crassostrea gigas) Are Resistant to Elevated CO2

Larval and Post-Larval Stages of Pacific Oyster (Crassostrea gigas) Are Resistant to Elevated CO2

Cambios organolépticos inducidos en la ostra japonesa Crassostrea gigas con dietas de las microalgas Thalassiosira pseudonana y Tetraselmis suecica

Morphogenetic and population structure of two species marine bivalve (Ostreidae: Saccostrea cucullata and Crassostrea iredalei) in Aceh, Indonesia

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