Reproductive pattern of the clams, Ruditapes decussatus and R. philippinarum on intertidal flats in Brittany

Laruelle, Franck; Guillou, J; Paulet, Yves-Marie

doi:10.1017/s0025315400039382

Cited by 83 publications

(65 citation statements)

References 10 publications

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“…g live weight -1 .day -1 ), permitted sexual maturation of Ruditapes decussatus. In all experiments normal gonadal development was observed, and was similar to that described by Laruelle et al (1994) and Rodríguez-Moscoso (2000) for R. decussatus during the reproductive cycle in natural populations. Our results have shown that the quantity of available food within the studied food range did not condition the gonadal development in this species, but modified some defining characteristics of gametogenesis.…”

Section: Discussionsupporting

confidence: 88%

“…However, there is currently no established relationship between food availability and gonadal development in R. decussatus or other Veneridae from the strictly histological point of view, despite abundant information concerning their reproductive cycle in natural populations (Pérez-Camacho, 1980;Beninger, 1982;Shaffee and Daoudi, 1991;Villalba et al, 1993;Xie and Burnell, 1994;Laruelle et al, 1994;Rodríguez-Moscoso, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Histological study of the gonadal development of Ruditapes decussates (L.) (Mollusca: Bivalvia) and its relationship with available food

Delgado¹,

Camacho²

2005

Sci. Mar.

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SUMMARY: This article describes the effects of food availability on the sexual maturation of Ruditapes decussatus through histological examination of the gonadal tissue. Three food rations were tested: High (H: 1 mg. organic matter. g live weight -1 .day -1 of the microalgae Isochrysis galbana clone T-ISO), intermediate (I: 0.5 mg OM g live weight -1 day -1 ) and nutritionally restricted (R: 0.25 mg OM g live weight -1 day -1 ). The tests were carried out at a constant temperature of 18ºC for a period of 70 days for diets H and I, and 120 days for diet R. The results showed that in R. decussatus the energy from ingestion was mainly channelled to reproductive processes, especially when food was restricted. The clams matured sexually under all the conditions tested, both with a somatic growth and with a loss of body mass. The available food was directly related to the rate of the gonadal development and with the total quantity of gonad generated. Equally, food restrictions limited gonadal recovery after spawning episodes. Food quantity also affected the dry weight of soft tissues (DW), which increased with the highest ration (H) and decreased notably with the lowest ration (R). Decreases in DW when food was scarce appeared to be more related to loss of reserve tissue rather than to variations in the quantity of reproductive tissue.Key words: Ruditapes decussatus, food availability, gonadal development, histology, maturity index. RESUMEN: ESTUDIO HISTOLÓGICO DEL DESARROLLO GONADAL DE RUDITAPES DECUSSATUS (L.) (MOLLUSCA: BIVALVIA) Y LA RELACIÓN CON EL ALIMENTO DISPONIBLE. -Este artículo describe los efectos de la disponibilidad de alimento en la maduración sexual de Ruditapes decussatus, a través del examen histológico del tejido gonadal. Se ensayaron tres raciones de alimento: Alta (H: 1 mg. materia orgánica. g live weight -1 .day -1 de la microalga Isochrysis galbana clone T-ISO), intermedia (I: 0.5 mg OM g live weight -1 day -1 ) y de restricción nutricional (R: 0.25 mg OM g live weight -1 day -1 ). Los ensayos se realizaron a una temperatura constante de 18ºC, y se prolongaron por un periodo de 70 días en el caso de las experiencias H e I, y de 120 días en el caso de la experiencia R. Los resultados muestran que en R. decussatus, la energía procedente de la ingestión se destina prioritariamente al proceso reproductivo, sobre todo en situaciones de restricción alimentaria. De esta forma, las almejas maduran sexualmente bajo todas las condiciones ensayadas, tanto en las que determinan un crecimiento somático, como en aquellas que producen una pérdida de masa corporal de las almejas. No obstante, el alimento disponible guarda relación directa con la velocidad del desarrollo gonadal y con la cantidad total de gónada generada. Igualmente, las restricciones de alimento pueden limitar las recuperaciones gonadales tras los episodios de puesta. La cantidad de alimento disponible repercute también en el peso seco de los tejidos blandos (DW), que se incrementa en la ración más elevada (H) y disminuye notablemente con la ra...

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Histological study of the gonadal development of Ruditapes decussates (L.) (Mollusca: Bivalvia) and its relationship with available food

Delgado¹,

Camacho²

2005

Sci. Mar.

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“…As gametogenesis is initiated at 12 • C in this species (Laruelle et al, 1994), clams from the three samples had empty gonads. Once in the laboratory, clams (37 to 50 mm length) were held in flow-through tanks in sieves containing field sediment.…”

Section: Biological Materials and Acclimation Proceduresmentioning

confidence: 90%

Impact of Brown Ring Disease on the energy budget of the Manila clam Ruditapes philippinarum

Flye-Sainte-Marie

Pouvreau

Paillard

et al. 2007

Journal of Experimental Marine Biology and Ecology

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Brown Ring Disease (BRD) is a bacterial disease caused by the pathogen, Vibrio tapetis. The disease induces formation of a brown deposit on inner shell of the Manila clam, Ruditapes philippinarum. Development of this disease is correlated with a decrease in the condition index of infected clams. Experiments were conduced in order to assess the effect of the development of BRD on two parameters affecting the energy balance of the clams: the clearance and the respiration rates. Experiments were performed in a physiological measurement system that allowed simultaneous measures of clearance and respiration rates. During both acclimation and measurements clams were fed with cultured T-iso and temperature was close to seasonal field temperature (10 • C). Our results showed that severely diseased clams (conchiolin deposit stage, CDS ≥ 4) are subject to weight loss in comparison to uninfected ones, indicating that BRD induces a desequilibrium in the energy balance. We demonstrated a reduction of the clearance rate of severely diseased clams which led to a decrease in energy acquisition. Respiration rate showed asignificant decrease with BRD symptoms, but evidence in the literature allowed us to hypothesize that energy mobilised for an immune response and lesion repair increases overall organism maintenance costs. Both factors should thus contribute to the degradation of the energy balance of diseased clams. Because effects of BRD on naturally infected clams only appears significant for CDS ≥ 4, when brown ring assumes a significant place on the inner shell, we consider that the Manila clam is tolerant of low disease levels.

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“…An increase of dry weight content started in March and coincided with an increase of temperature, Chl a, MICRO and especially NANO abundances. Laruelle et al (1994) also found that the maximum rate of increase in weight of Venerupis decussata occurs in the spring when both the sea temperature and food supply increase rapidly. Percent of dry weight of A. noae declined in May and July.…”

Section: Discussionmentioning

confidence: 86%

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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Reproductive pattern of the clams, Ruditapes decussatus and R. philippinarum on intertidal flats in Brittany

Cited by 83 publications

References 10 publications

Histological study of the gonadal development of <i>Ruditapes decussates</i> (L.) (Mollusca: Bivalvia) and its relationship with available food

Histological study of the gonadal development of <i>Ruditapes decussates</i> (L.) (Mollusca: Bivalvia) and its relationship with available food

Impact of Brown Ring Disease on the energy budget of the Manila clam Ruditapes philippinarum

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

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