Hydrodynamic control of filtration in Placopecten magellanicus

Wildish, D. J.; Saulnier, A.M.

doi:10.1016/0022-0981(93)90251-i

Cited by 72 publications

(33 citation statements)

References 14 publications

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“…It has been suggested that decrease in growth rates for scallops under high speed flow conditions is mainly due to inhibition of their feeding activity (KirbySmith, 1972). Wildish and Saulnier (1993) found a unimodal relationship between the filtration rate of P. magellanicus and flow velocity, with high filtration rates at low speed flow and low filtration rates at high speed flow. According to the authors, the decrease in the filtration rate of P. magellanicus was caused by the reduction of the exhalant opening which, in turn, was controlled by how much the valves opened.…”

Section: Orientación Y Flujomentioning

confidence: 89%

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Esquivel¹,

Sierra²,

Pámanes³

2000

Cienc. Mar.

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Recibido en diciembre de 1999; aceptado en agosto de 2000 RESUMENSe utilizó un sistema cerrado con recirculación de agua de mar para evaluar el efecto de la velocidad (0, 5, 10 y 15 cm/s) y dirección del flujo (organismos libres; horizontal a favor, horizontal en contra o vertical a favor de la corriente), sobre el crecimiento de juveniles (5.5 a 7.7 mm) de la escalopa Nodipecten subnodosus. Se midió, además, la tasa de crecimiento de N. subnodosus a tres concentraciones de alimento (33, 66 y 100 cél/µL) de Isochrysis galbana (clon T-ISO). Las tasas más altas de crecimiento específico (TCE) y absoluto (TCA) se observaron en las escalopas libres y en organismos orientados horizontalmente a favor del flujo (TCE = 2.5 %/d; TCA = 190 a 200 µm/d) a velocidades de 5y 10 cm/s, seguidas por los organismos orientados verticalmente a favor y horizontalmente en contra (TCE = 1.7 a 2.3 %/d; TCA = 129 a 169 µm/d). Los juveniles libres expuestos a velocidades de 15 cm/s fueron arrastrados por la corriente. La longitud y peso de las escalopas aumentó con el incremento en la concentración de alimento, de acuerdo con una relación hiperbólica. Después de 15 días, los valores máximos de longitud (7.5 mm) y peso del tejido (3.5 mg) se observaron a las dos concentraciones de alimento más bajas (33 y 66 cél/µL). Se concluye que los juveniles de N. subnodosus pueden cultivarse exitosamente en el laboratorio a una velocidad de flujo entre 5 y 10 cm/s y a concentraciones de alimento de 33 cél/µL.Palabras clave: Nodipecten subnodosus, flujo, crecimiento, escalopas, orientación. ABSTRACTAn enclosed system with recirculating seawater was used to evaluate the effect of flow speed (0, 5, 10and 15 cm/s) and direction (free organisms or horizontal with inhalant opening towards and against

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Section: Orientación Y Flujomentioning

confidence: 89%

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Esquivel¹,

Sierra²,

Pámanes³

2000

Cienc. Mar.

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“…In-deed, sampling was accomplished during high-water season with relatively high water flow and disturbances. Consequently, the oysters may partially or totally close their valves to resist to the external pressure from flow velocity, affecting food intake and lead to reduced stomach fullness or an increase in the number of empty stomachs [47,48].…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of the mangrove oyster, <i>Crassostrea gasar</i> (Dautzenberg, 1891) in traditional farming at the coastal zone of Benin, West Africa

Adité¹,

Sonon²,

Gbedjissi³

2013

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Wild collection management and farming of the mangrove oyster (Crassostrea gasar) occurring widely at the Benin (West Africa) coastal zone require knowledge on the feeding ecology to explore energy sources and nutritional needs. Six hundred thirty (630) individuals of C. gasar have been sampled in the rearing site at the Benin coastal lagoon to investigate on the trophic ecology of this cultivated bivalve. The diet analysis revealed that C. gasar is a filter-feeder foraging mainly on phytoplankton (72.70%) and substrate particles (22.95%). This trophic specialization results from anatomical structure, mainly the presence of gills which facilitate the filtering of number of plankton taxa. Dominant phytoplanktons ingested comprised of Diatomophycea (33.52%), Chlorophycae (17.19%), Scenedesmacae (13.80%), Dictyosphaeriacae (3.79%), and Pleurococcacae (2.75%). Eight genuses of phytoplankton, Polycystis, Coelosphaerium, Protococcus, Botryoccocus, Crucigenia, Melosira, Cyclotella, and Gyrosigma dominated the diet of C. gasar with aggregated volumetric proportions reaching 69.06% of the diet. Higher occurrences were recorded mainly for Melosira occurring in 263 (41.75%) stomachs, substrate particles in 211 (33.49%), and Polycystis in 151 (23.97%). C. gasar exhibited a high niche breadths varying from 4.54 to 5.78, suggesting that this bivalve consumed a high variety of food items, thus exhibiting a degree of trophic plasticity. Diet overlaps ( jk ) among different size classes were high and varied from 0.71 to 0.98, indicating an ontogenetic diet shift pattern in C. gasar. Probably, to adapt to the benthic-muddy environment and to increase survival, C. gasar has evolved a specialized feeding mechanism and strategy to retrieve only needed nutrients for growth and to reject awful and nondigestible foods. Also, at the oyster rearing grounds, there is an evidence of shift in the food web structure leading to an increase of the biological productivity at the coastal zone. The output from this study is a valuable documentation for the sustainable development of oyster aquaculture, wild stock management and conservation. However, further scientific knowledge on nutritional needs, phytoplankton toxicity and habitat degradation, and improvement of farming techniques are required for an integrated oyster management.

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“…Nonsiphonate bivalve molluscs generally show a negative effect of increasing current velocity on filtration or filtration rate (Cahalan et al, 1989). Moreover, particles are directed towards the mouth by ciliary motions which may be affected by high current velocities (Ward et al, 2003) or a bypass of the gill structure (Wildish et al, 1987;Wildish & Saulnier, 1993).…”

Section: Filtration Ratementioning

confidence: 99%

“…In this range, the hydrodynamic forcing applied on organisms allows filtration processes to proceed up to an optimum rate, but for higher current velocities, water motion becomes a stress source, affecting the efficiency of the filtration system and the energy yielded (Wildish & Kristmanson, 1997in Lionel et al, 2007. Filtration rate of bivalves, with siphons facing into the current, are directly inhibited by hydrodynamic effects on the functioning of the bivalves pump (Eckman et al, 1989), and (Wildish & Saulnier, 1993). At increasing current velocity, pressures applied to the inhalant (Wildish & Miyares, 1990, Newell et al, 2001 or to the exhalant (Wildish & Saulnier, 1993) and (Eckman et al, 1989) aperture facing into the current would result in higher pressures than produced by the ciliary pump, result in slower growth rates or reduced filtration rate.…”

Section: Filtration Ratementioning

confidence: 99%

“…Filtration rate of bivalves, with siphons facing into the current, are directly inhibited by hydrodynamic effects on the functioning of the bivalves pump (Eckman et al, 1989), and (Wildish & Saulnier, 1993). At increasing current velocity, pressures applied to the inhalant (Wildish & Miyares, 1990, Newell et al, 2001 or to the exhalant (Wildish & Saulnier, 1993) and (Eckman et al, 1989) aperture facing into the current would result in higher pressures than produced by the ciliary pump, result in slower growth rates or reduced filtration rate. Newell et al, (2001) studied the effects of velocity on exhalant siphon area and valve gape in mussel Mytilus edulis.…”

Section: Filtration Ratementioning

confidence: 99%

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EFFECTS OF CURRENT VELOCITY ON FILTRATION AND INGESTION RATE OF PEARL OYSTER (Pinctada maxima)

Supii

Lestari

Sudewi

2012

Indonesian Aquaculture Journal

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Pinctada maxima is a filter feeder organism obtaining food particles by filtration from water suspension. Filtration and ingestion rate of a large number of benthic filter feeders in a variety of coastal environment have been known influenced by current velocity. The purposes of this study were to examine the effects of current velocity on filtration and ingestion rate of pearl oyster P. maxima and to determine the best current velocity. Randomized Block Design was used in this experiment with four current treatments of 8, 16, 24, and 32 cm s -1 . The results of this experiment demonstrated that current velocity has a marked effect on filtration rate of P. maxima and that this species follows the general pattern of response observed for other bivalves. Different velocity affected filtration and ingestion rate in pearl oyster P. maxima. It was gradual decline in the suspension feeding with increasing velocity. Filtration rate of bivalves with siphons facing into the current, were directly inhibited by hydrodynamic effects on the functioning of the bivalves pump. At increasing current velocity, pressures applied to the inhalant and exhalant aperture facing into the flow would result in higher pressures than that of produced by the ciliary pump, resulting in reduced filtration rate. The highest filtration and ingestion rate in this experiment were obtained at velocity of 8 cm s -1 that achieved 3.409±0.485 l/h and 37.91±1.27 (x10 7 ) cells/h, respectively.

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Hydrodynamic control of filtration in Placopecten magellanicus

Cited by 72 publications

References 14 publications

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Feeding ecology of the mangrove oyster, <i>Crassostrea gasar</i> (Dautzenberg, 1891) in traditional farming at the coastal zone of Benin, West Africa

EFFECTS OF CURRENT VELOCITY ON FILTRATION AND INGESTION RATE OF PEARL OYSTER (Pinctada maxima)

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Hydrodynamic control of filtration in Placopecten magellanicus

Cited by 72 publications

References 14 publications

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Effect of flow speed and food concentration on the growth of juvenile scallops nodipecten subnodosus

Feeding ecology of the mangrove oyster, &lt;i&gt;Crassostrea gasar&lt;/i&gt; (Dautzenberg, 1891) in traditional farming at the coastal zone of Benin, West Africa

EFFECTS OF CURRENT VELOCITY ON FILTRATION AND INGESTION RATE OF PEARL OYSTER (Pinctada maxima)

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Feeding ecology of the mangrove oyster, <i>Crassostrea gasar</i> (Dautzenberg, 1891) in traditional farming at the coastal zone of Benin, West Africa