Seasonal variation in weight and biochemical composition of the Pacific oyster, Crassostrea gigas in relation to the gametogenic cycle and environmental conditions of the Bizert lagoon, Tunisia

Dridi, Salwa; Romdhane, Mohamed Salah; Elcafsi, Mhamed

doi:10.1016/j.aquaculture.2006.10.028

Cited by 229 publications

(153 citation statements)

References 45 publications

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“…Condition index in this study varied between 1.54% and 8.8%. We can state that these values, which are in parallel to the studies carried out by Acarlı (2005) in Aegean Sea and by Dridi et al (2007) in Tunisia, provide ideal conditions for oyster culturing. According to Okumus and Stirling (1998) fluctuations in the CI and MY have important implications for cultivation and harvesting strategy.…”

Section: Resultssupporting

confidence: 70%

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

Yıldız

Berber

Acarlı

et al. 2011

Italian Journal of Animal Science

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This study was conducted in Dardanelles between October 2007 and August 2009 when condition index, meat yield, biochemical compositions and environmental parameters of seawater were investigated and the study area was found to have available conditions for cultivation. Investigation of the study area showed a positive correlation in particular among condition index, seasonal variation of temperature, protein, fat and chlorophyll-a; a negative correlation was seen between them and carbohydrate value. It was clear from the two years study that the most ideal period for oyster harvest is April and August especially when condition index was maximum followed by a winter with no oyster yield is available in terms of the related processes involving oyster cultivation.

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Section: Resultssupporting

confidence: 70%

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

Yıldız

Berber

Acarlı

et al. 2011

Italian Journal of Animal Science

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“…Between July and September, the end of spawning was followed by the resting stage and the early growth stage, during which the animals started to accumulate glycogen. Dridi et al (2007) found high CI values in C. gigas during the winter. During this period of sexual inactivity, reserves of energy and nutrients are accumulated.…”

Section: Field Experimentsmentioning

confidence: 80%

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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“…The accumulation and mobilization of energy reserves, according to the stage of the reproductive cycle, is reported in different marine bivalve species (Beninger & Lucas, 1984;Robert et al, 1993;Galap et al, 1997;Berthelin et al, 2000;Dridi et al, 2007). Protein and lip- id level in A. noae reached the maximum value in June, just before spawning, following the decrease in macromolecule content.…”

Section: Discussionmentioning

confidence: 98%

“…Fatty acid profiles of total lipids extracted from various bivalves showed the prevalence of total polyunsaturated fatty acids (PUFA) over saturated (SFA) and monounsaturated (MUFA) acids (Orban et al, 2002(Orban et al, , 2006. Changes in fatty acid composition are closely related to available food and high levels of PUFA correspond with good nutritional conditions (Ojea et al, 2004;Dridi et al, 2007). Carbohydrates have two major biological functions: as long term energy storage and as structural elements (Robledo al., 1995).…”

Section: Introductionmentioning

confidence: 99%

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Biochemical and fatty acid composition of Arca noae (Bivalvia: Arcidae) from the Mali Ston Bay, Adriatic Sea

et al. 2014

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Biochemical and fatty acid composition of the bivalve Arca noae were investigated in the Mali Ston Bay in relation to environmental conditions. Sampling was carried out monthly, from December 2001 to November 2002. Wet shellfish meat consists on average of 77.61% water and 22.39% dry matter, while dry shellfish meat consists on average of 89.04% organic and 10.96% inorganic matter. PCA analysis identified temperature, nitrate, silicate, MICRO, Chl a and salinity as the most important environmental factors influencing biochemical composition of A. noae. An increase of dry weight content of A. noae was observed during the spring when both the sea temperature and food supply increased rapidly. Contents of protein (54.39-62.06% of dry weight), carbohydrate (4.13-8.07% of dry weight) and lipid (3.46-8.58% of dry weight) varied significantly during the year. Protein and lipid level reached the maximum value in June. The fatty acid profiles of total lipids extracted from A. noae showed high level of unsaturation (UNS/SAT 1.9-3.4). Total polyunsaturated fatty acids (PUFA) represented the majority of total fatty acids (40.3-59.9% of total fatty acids) and the most abundant were eicosapentaenoic (20:5n-3) and docosahexaenoic (22:6n-3) acid. n-3/n-6 PUFA ratio value varied between 2.1 and 5.0 and was the highest during the spring (April to June). Due to their low lipid and high percentages of healthy polyunsaturated fatty acids A. noae can be evaluated as a quality seafood product. The most suitable period of the year for its consumption is in the spring when it reaches its highest nutritional values.

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Seasonal variation in weight and biochemical composition of the Pacific oyster, Crassostrea gigas in relation to the gametogenic cycle and environmental conditions of the Bizert lagoon, Tunisia

Cited by 229 publications

References 45 publications

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

The reproductive cycle of the oyster Crassostrea gasar

Biochemical and fatty acid composition of Arca noae (Bivalvia: Arcidae) from the Mali Ston Bay, Adriatic Sea

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