Seasonal biochemical variations in Pacific oyster gonadal tissue during sexual maturation

Li, Qi; Osada, Makoto; Mori, Keiichiro

doi:10.1046/j.1444-2906.2000.00067.x

Cited by 81 publications

(51 citation statements)

References 27 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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“…Furthermore, the high protein content in the gonads of H. trunculus may constitute an alternative energetic reserve during gametogenesis, as reported in some bivalve species (Beninger & Lucas 1984, Galap et al 1997. For instance, gonadal protein could be accumulated as vitellin associated with lipids as in Crassostrea gigas (Li et al 2000), and might be used to synthesize lipids or carbohydrates as in T. sarmaticus (McLachlan & Lombard 1980). Interestingly, the monthly variation in the foot protein content of H. trunculus showed an evident decrease immediately before the spawning peak (March to April), which might suggest a possible mobilisation of protein reserves to support the reproductive effort.…”

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confidence: 91%

Reproductive cycle and biochemical composition of Hexaplex trunculus (Gastropoda: Muricidae) from Bizerte lagoon, northern Tunisia

Gharsallah¹,

Vasconcelos²,

Zamouri-Langar³

et al. 2010

Aquat. Biol.

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This study investigates the reproductive cycle, size at first sexual maturity and biochemical composition of Hexaplex trunculus from the Bizerte lagoon (northern Tunisia). Overall, females predominated over males, resulting in an unbalanced sex ratio of 1.2:1. Males dominated in the smaller size classes (< 40 mm shell length, SL), sex ratios were balanced at the 40 to 50 mm SL range, and females dominated in the larger size classes (> 50 mm SL). The gonad developmental stages and the gonadosomatic index (GSI) indicated that H. trunculus apparently has an annual reproductive cycle with extended periods of gonadal activity. In both sexes, examination of the appearance of the gonads showed that gamete release occurred mainly from March to May (with an apparent spawning between March and April), followed by a period of empty gonads between June and August. Sexual maturity occurred at smaller sizes in males (SL 50 = 41.02 mm SL) than in females (SL 50 = 50.47 mm SL). The contents of protein, lipids and carbohydrates were invariably greater in the gonads than in the foot, confirming the key role of the reproductive tissues in energetic storage. The monthly variation in protein, lipids and carbohydrates in the gonads followed the oscillation in the relative proportion of developed gonads and in the GSI, reflecting energetic mobilisation during maturation and spawning. Overall, the data gathered in this study constitutes valuable baseline information for making preliminary recommendations to the fishing community targeting H. trunculus in the Bizerte lagoon. Further studies and more solid data on the reproductive cycle of the species are required before definitive management measures for this locally important artisanal fishery can be proposed. KEY WORDS: Reproductive cycle · Spawning season · Size at sexual maturity · Biochemical composition · Fisheries management · Hexaplex trunculus · Muricidae · Bizerte lagoon Resale or republication not permitted without written consent of the publisherAquat Biol 10: 155-166, 2010 156 the Atlantic is mainly restricted to the coasts of Portugal and Morocco, and the Madeira and Canary archipelagos (Poppe & Goto 1991, Houart 2001). This species is harvested for human consumption and has commercial value in several Mediterranean countries such as Spain, Italy, Croatia, Cyprus and Turkey (Fischer et al. 1987), as well as along the Atlantic coasts of Spain (mainly in Andalusia) (Anon 2001) and Portugal (mainly in Algarve) (Vasconcelos et al. 2008a). In the Bizerte lagoon (northern Tunisia), the banded murex is the target species of an artisanal fishery using baited traps, but is also a bycatch species in fishing nets (Gharsallah et al. 2004). The banded murex constitutes a locally important fishing resource in the Bizerte lagoon, with estimated monthly catches of ~1.8 tons between 1999 (I. H. Gharsallah unpubl. data), but the fishery lacks specific regulations (e.g. minimum landing size, closed seasons in fishing activity).While some studies on the reproductive biology an...

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“…Many papers have reported on the biological and ecological aspects, and have gradually determined the chemical components in the oyster tissues, such as glycogen 3 and amino acids 4 . However, there is as yet little comparative study of C. gigas under the different environmental conditions between the two countries.…”

Section: Introductionmentioning

confidence: 99%

High Levels of Icosapentaenoic Acid in the Lipids of Oyster Crassostrea gigas Ranging over Both Japan and France

Saito¹,

Marty²

2010

J. Oleo Sci.

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The lipid and fatty acids of the Pacific oyster, Crassostrea gigas, collected both in Japan and France, were analyzed. Triacylglycerols and sterols were the major classes in the neutral lipids of both populations of C. gigas between the two countries, and they had signifi cant levels of phospholipids (phosphatidylethanolamine and phosphatidylcholine) with ceramideaminoethylphosphonate in their polar tissue lipids. The differences of 18:3n-3 and 22:6n-3 (docosahexaenoic acid; DHA) levels in the depot triacylglycerols suggest the infl uence of dietary phytoplankton in different environments of the two countries. Although the levels of the fatty acids slightly differed, that of 20:5n-3 (icosapentaenoic acid; EPA, 20.5-24.8%) in the triacylglycerols was specifi cally the highest fatty acid in all the samples. The major polyunsaturated fatty acids in the polar lipids of all samples were EPA (13.2-17.8% for phosphatidylethanolamine and 13.4-22.7% for phosphatidylcholine) and DHA (18.9-26.8% for phosphatidylethanolamine and 13.1-22.5% for phosphatidylcholine). The fl uctuation of total PUFA levels in the polar lipids between samples of both countries suggests the infl uence of diet. In addition, the consistently high EPA levels in the phospholipids may compensate for the variation in DHA levels.

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Seasonal biochemical variations in Pacific oyster gonadal tissue during sexual maturation

Cited by 81 publications

References 27 publications

The reproductive cycle of the oyster Crassostrea gasar

The reproductive cycle of the oyster Crassostrea gasar

Reproductive cycle and biochemical composition of Hexaplex trunculus (Gastropoda: Muricidae) from Bizerte lagoon, northern Tunisia

High Levels of Icosapentaenoic Acid in the Lipids of Oyster Crassostrea gigas Ranging over Both Japan and France

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