The effect of velocity and flow direction on the growth of juvenile and adult giant scallops

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

doi:10.1016/0022-0981(92)90032-6

Cited by 66 publications

(25 citation statements)

References 10 publications

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“…However, specific growth rates found in this experiment (1.6 to 2.6 %/d) were higher than those reported for juveniles of P. magellanicus (0.54%/d) (Wildish and Saulnier, 1992). In the present study, the scallop N. subnodosus had greater growth when it was oriented with the ventral margin towards the flow.…”

Section: Orientación Y Flujocontrasting

confidence: 87%

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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 Flujocontrasting

confidence: 87%

“…The best growth rates were attained at speeds below 1cm/s. Wildish and Saulnier (1992) found similar results with the scallop Placopecten magellanicus.…”

Section: Introductionsupporting

confidence: 69%

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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“…This could be attributed to increased food supplies or feeding efficiency (Wildish & Kristmanson 1985, Eckman 1987). In contrast, other studies have reported that growth rates tend to decrease with increased flow velocity (Wildish et al 1987, Eckman et al 1989, Wildish & Saulnier 1992.…”

Section: Introductionmentioning

confidence: 45%

Distribution of cockles Cerastoderma edule in the Eastern Scheldt: habitat mapping with abiotic variables

Kater¹,

Kessel²,

Baars³

2006

Mar. Ecol. Prog. Ser.

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On the basis of maps of environmental variables and annual surveys, a habitat map was constructed for the cockle Cerastoderma edule, a commercially exploited dominant suspension feeder in the Eastern Scheldt (The Netherlands). The results obtained show that the distribution of cockles can be described using emersion time and current velocity. Salinity does not play a significant role, even though low salinities are known to limit the distribution of cockles in other areas. The response to current velocity was as expected, but the response to emersion contradicted results from other studies. These responses cannot be explained as the result of competition for space with the recently expanded Pacific oyster population, because Pacific oysters are most common in habitats that are unsuitable for cockles. Possible explanations for cockles' apparent preference for settling in areas with relatively long emersion times are high predation pressure or instability of the sediment around low water level. KEY WORDS: Cerastoderma edule · Habitat map · Eastern ScheldtResale or republication not permitted without written consent of the publisher

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“…Rapid temperature shifts may induce a long-term stress not reflected in our calculations (Dickie 1958), and the food ration derived from a 2 or 3 d peak in phytoplankton biomass may not be represented adequately in mean food concentration. In addition, weighting of the data may be necessary since factors such as temperature, SPM inorganic fraction, and flow rates have critical thresholds (Dickie 1958, Vahl 1981, Wildish & Saulnier 1992. For example, a knowledge of food concentration or quality is of limited value if ambient currents are high enough to inhibit feeding.…”

Section: Empirical Modelsmentioning

confidence: 99%

“…For scallops, flume experiments have shown that the direction and magnitude of water currents affect growth by controlling seston supply or altering filtration rates (Eckman et al 1989, Wildish & Saulnier 1992), but not all field studies can link flow to soft-tissue growth (e.g. Frechette 1989).…”

Section: Introductionmentioning

confidence: 99%

Growth and survival of sea scallops Placopecten magellanicus: effects of culture depth

Emerson¹,

Grant²,

Mallet³

et al. 1994

Mar. Ecol. Prog. Ser.

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We combined extensive water sampling with monthly growth measurements of juvenile sea scallops held in cages 0 to 200 cm above the bottom to (1) construct predictive empirical models of shell and soft-tissue growth based on oceanographic variables, and (2) determine whether scallops on or near the bottom can derive a food supplement from resuspended sediment when seasonal phytoplankton production is low. Variation in growth was strongly dependent on depth, but this relationship was not consistent over time or tissue type. In late fall, when phytoplankton biomass was generally low (-1 pg chl I-'), the adductor muscle of scallops on the bottom lost mass (-1.5 mg dry wt d.'), but for scallops held only 20 cm higher in the water column, growth was 2.5 mg d.'. During the winter, softtissue growth on the bottom was significantly lower than that of scallops held above the sediment surface. At this time, there was no variation in shell growth with respect to depth. At the end of the study, soft-tissue weight (excluding muscle tissue) of scallops on the bottom was -40% less than that of scallops growing 250 cm above bottom. Rather than providing an energetic benefit, results suggest that high concentrations of seston near the bottom inhibit growth. Empirical regression models of scallop growth using data from water sampling every 2 wk accounted for up to 68% of growth variation, with temperature and seston quality being the most important predictor variables. Marginal improvements to the model uslng data collected hourly with In situ probes suggest that estimates of food supply should be corrected, i.e. reduced, when high flows or high seston concentrations limit filtration rates. In addition, results indicate that attention to the magnitude and variation of predictor variables without consideration of their seasonal coherence may be a primary factor limiting the ability to construct truly predictive models of bivalve growth.

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The effect of velocity and flow direction on the growth of juvenile and adult giant scallops

Cited by 66 publications

References 10 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

Distribution of cockles Cerastoderma edule in the Eastern Scheldt: habitat mapping with abiotic variables

Growth and survival of sea scallops Placopecten magellanicus: effects of culture depth

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