Uxio Labarta

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• Ph D
• Research Professor at Spanish National Research Council

Assessing the carbon footprint of marine bivalve aquaculture demands an accurate estimation of the CO2 release associated to capital goods and aquaculture operations but also to the metabolic CO2 budget of the cultured species. Nowadays, there are discrepancies on the processes to include in that budget, how to estimate them, and which scale should...

Abstract Forecasting of climate change impacts on marine aquaculture production has become a major research task, which requires taking into account the biases and uncertainties arising from ocean climate models in coastal areas, as well as considering culture management strategies. Focusing on the suspended mussel culture in the NW Iberian coastal...

Este libro se corresponde con el numero 34 de la serie de Informes Anuais sobre A Economía Galega, que bajo la dirección del Profesor Alberto Meixide se realiza por un amplio equipo, desde el año 1986 en el que se publicó el primer numero, una síntesis de la economía gallega en los cinco años previos, continuando anualmente hasta este Informe 34 qu...

Abstract Understanding and modelling bivalve growth dynamics under variable environmental conditions are crucial for the development of management and sustainability aquaculture plans. This work proposes a new dynamic bivalve growth model that combines net production Dynamic Energy Budget (DEB) theory and the species-specific growth dynamics of th...

The mussels industry with a production that accounts for more than twenty five percent of the fresh product landings from the sea, and the full-time employment of more than 8000 people, is by far the largest productive activity of the Galician sea. In the 1980s was noticed an increase in productivity related to processes of innovation in the indust...

Determining the magnitude and causes of intrinsic variability is a main issue in the analysis of bivalve growth. Inter-individual variability in bivalve growth has been attributed to differences in the physiological performance. This hypothesis has been commonly tested comparing the physiological rates of fast and slow growers after size differenti...

Supporting information for Section 3. (DOCX)

The Galician coastline is enormously productive of high-quality seafood due to the vast supply of nutrients , oxygen and plankton in this unique coastal up-welling system 1. One of the characteristics of the Rías is the abundance of raft farms, "bateas": floating wooden structures with 500 ropes hanging into the water column and on which mussels gr...

Extended DEB model to simulate the growth of mussels

Inter-individual variabiltiy in the growth of even-aged and even-sized juvenile mussels. Fhysiological perofrmance of slow, regular, and fast growers

The fast rise of aquaculture practices during the last decades has increased the need of adopting culture strategies to optimize production and guarantee the sustainability of the sector. This study aimed to provide a management tool to help mussel farmers identify optimal culture strategies and use production inputs efficiently. For this purpose,...

This study aims to analyze the seasonal variations in seston biochemical compounds (biopolymeric organic carbon (C-BPC), i.e. the sum of proteins, carbohydrates and lipids) in order to infer the bioavailable organic fraction controlling food absorption by mussels cultured in a Galician Ria. Different proxies for high-quality food (including C-BPC)...

This study suggests revision of ecological concepts as food depletions and/or water flow reductions based on idealized linear flows through mussel rafts. We offer an alternative based on the extension of the clearance area, defined as the area affected by the nonlinear effects produced by each raft and surroundings ones. These conclusions are suppo...

Understanding biological processes, such as growth, is crucial to development management and sustainability plans for bivalve populations. von Bertalanffy and Gompertz models have been commonly used to fit bivalve growth. These models assume that individual growth is only determined by size, overlooking the effects of environmental and intrinsic co...

Identifying the environmental factors driving larval settlement processes is crucial to understand the population dynamics of marine invertebrates. This work aims to go a step ahead and predict larval presence and intensity. For this purpose we consider the influence of solar irradiance, wind regime and continental runoff on the settlement processe...

Allometric relationships between biometric parameters (i.e., soft body and shell weights and shell organic content vs. shell length) as well as for routine and standard metabolic and ammonia excretion rates related to flesh weight and shell length were estimated and compared for subtidal and intertidal populations of Mytilus galloprovincialis in Ga...

Mussel seed (Mytilusgalloprovincialis) gathered from the intertidal and subtidal environments of a Galician embayment (NW, Spain) were maintained in the laboratory during five months to select fast (F) and slow (S) growing mussels. The physiological basis underlying inter-individual growth variations were compared for F and S mussels from both orig...

Two-way ANOVA testing significant differences in biometric parameters between mussel seed from two growth groups (fast and slow-growers) and two origins (subtidal and intertidal). (DOCX)

Two-way ANOVA testing significant differences in physiological parameters between mussel seed from two growth groups (fast and slow-growers) and two origins (subtidal and intertidal). (DOCX)

Microsoft Excel file with the complete data set used for the preparation of this study. (XLS)

Energetic equivalents of the total energy allocated for Shell growth and Tissue growth and the Growth Efficiency in mussels at the beginning of the experiment and after 5 months of acclimation in the laboratory to select the individuals with slow and fast growth rates. The energetic equivalents were obtained from Wolowicz, and Goulletquer (1999). (...

We analysed the effect of temperature, coupled with food ingestion rate (IR), on the fatty acid (FA) profile of female and male clams conditioned in two groups: L (low IR at 14 and 18 °C) and H (high IR at 18 and 22 °C). Significant differences for group L, both 18L and 14L with low IR and slow gonadal development, owed to differences in energy bal...

We analyzed the spatial and temporal variability of seston parameters at 4 locations in the Ría de Ares-Betanzos (NW Spain) over 5 yr. Seston content was higher in the inner part of the ría and during winter, while seston quality was higher in the outer part of the ría with maximum values during summer, and exhibited a marked relationship with wate...

Fish farming releases extensive amounts of particulate organic waste that can be exploited by bivalves in integrated culture. We tested if mussels Mytilus galloprovincialis cultured at two depths (1 and 6 m) in a raft, moored 170 m from a fish farm had greater growth than bivalves held 550 m from the fish cages. Mussel growth was monitored monthly,...

On October 28th 1982 the Socialist Party (PSOE) won a clear victory in the Spanish legislative elections under the leadership of Mr. Felipe González who had run under the slogan “For change”, “Por el cambio”. Asked a few days after the elections for the exact meaning of the slogan the new president said that “change” simply meant that Spain worked.

Population dynamics on mussels growing on suspended culture depend mainly on the balance of several processes: mortality and/or dislodgements from the ropes, recruitment and growth. The negative effect of overcrowding on mussels growth and survival has been widely studied. Other works have addressed the effect of population size on recruitment on b...

This study describes the physiological performance of two populations of the razor clam Tagelus dombeii from two geographic areas with different histories of exposure to paralytic shellfish poisoning (PSP) linked to the toxic dinoflagellate Alexandrium catenella. Clams from Melinka-Aysén, which are frequently exposed to PSP, were not affected by th...

INTRODUCTION Previous studies have demonstrated that biodeposits –the collective term for feces and pseudofeces– from suspended mussels tend to accumulate in shallow coastal areas with low hydrodynamism, generating organic enrichment and negative impact in the benthic community beneath the culture units (Cranford et al., 2009). Deposit-feeding sea...

The limited availability of empirically derived parameters describing the body drag and trophic resource depletion properties of mussel aquaculture farms has contributed to uncertainty in model predictions of farm carrying capacity. Time-series of flow reduction and total and size-specific suspended particle depletion were obtained for two mussel (...

We analyzed absorption efficiency (AE) and digestive enzyme activity (amylase, cellulase complex, and laminarinase) of the infaunal bivalve Tagelus dombeii originating from two geographic sites, Corral-Valdivia and Melinka-Aysén, which have different long-term paralytic shellfish poisoning (PSP) exposure rates. We report the effects of past feeding...

The main drawback of the traditional self-thinning model is how time is handled. Self-thinning (ST) has been formally recognized as a dynamic process, while the current ST models have not included the temporal effect. This restricts the analysis to the average competitive behaviour of the population and produces a biased estimation of the self-thin...

The effects of seawater acidification caused by increasing concentrations of atmospheric carbon dioxide (CO2), combined with other climatic stressors, were studied on 3 coastal Mediterranean bivalve species: the mussel Mytilus galloprovincialis and the clams Chamelea gallina and Ruditapes decussatus. CO2 perturbation experiments produced contrastin...

We investigated the filter-feeding behaviour of individual Mytilus galloprovincialis Lmk in the Ría de Vigo (Galicia, northwest Iberian Peninsula) in order to assess changes in water column biogeochemistry due to mussel culture and the effect of seston organic content on mussel physiological rates. The study was carried out during 1 yr under differ...

Coastal ocean acidification is expected to interfere with the physiology of marine bivalves. In this work, the effects of acidification on the physiology of juvenile mussels Mytilus galloprovincialis were tested by means of controlled CO2 perturbation experiments. The carbonate chemistry of natural (control) seawater was manipulated by injecting CO...

Crowding conditions in bivalve populations cause intraspecific competition processes, resulting in individual growth reduction and, in extreme cases, density dependent mortality. In aquaculture, where density is usually maximized to obtain a greater commercial yield, this fact leads to a decrease in the total biomass of the ropes and to an increase...

Self-thinning (ST) models have been widely used in the last decades to describe population dynamics under intraspecific competition in plant and animal communities. Nevertheless, their applicability in animal populations is subjected to the appropriate inclusion of space occupancy and energy requirements. Specifically, the disposition of gregarious...

Mussel culture is one of the most important economic marine resources in Galicia, Spain, a region in the northwest of the Iberian Peninsula where mussel production is the highest in Europe. Most of these mussels grow in rafts that are grouped in farms. The mussel farm was located on a small bay on the Rías Altas, with a beach surrounded by rocky cl...

Coastal ocean acidification is expected to interfere with the physiology of marine bivalves. In this work, the effects of acidification on the physiology of juvenile mussels Mytilus galloprovincialis were tested by means of controlled CO2 perturbation experiments. The carbonate chemistry of natural (control) seawater was manipulated by injecting CO...

Crowding conditions in bivalve populations cause intraspecific competition processes, resulting in individual growth reduction. In aquaculture, density is usually maximized to obtain a greater commercial yield. Commercial farms provide an ideal scenario for studying the effect of density on mussel growth in suspended culture systems. In this study,...

Bivalve molluscs are characterized by high morphological plasticity in response to variations in local environmental conditions. In the present study, we evaluate this capacity in the mussel Mytilus galloprovincialis with regard to intra-specific competition caused by cultivation density. Suspended cultivation ropes at different initial densities (...

The environmental and the economic importance of shellfish stimulated a great deal of studies on their physiology over the last decades, with many attempts to model their growth. The first models developed to simulate bivalve growth were predominantly based on the Scope For Growth (SFG) paradigm. In the last years there has been a shift towards the...

Coastal upwelling systems can directly or indirectly affect the population dynamics of marine invertebrates due to their influence on residual circulation patterns and biological production cycles. In the present study we evaluated the influence of shelf winds and continental runoff on settlement patterns of Mytilus galloprovincialis at 2 contrasti...

Effects of coastal ocean acidification, other than calcification, were tested on juvenile clams Ruditapes decussatus during a controlled CO2 perturbation experiment. The carbonate chemistry of natural (control) seawater was manipulated by injecting CO2 to attain 2 reduced pH levels (–0.4 and –0.7 pH units) as compared with the control seawater. Aft...

Variability of total free amino acid (TFAA) pool in Mytilus galloprovincialis was analysed following raft culture of growing mussels. With the aim to ensure the actual effect of animal’s size, a mussel population was sampled in laboratory covering the field size (15- to 60-mm shell length). TFAA showed a constant profile regardless size increase of...

O2, N, P and Si net ecosystem metabolism of the Ría de Ares–Betanzos (NW Iberian upwelling system) was estimated during two 3-wk periods of contrasting summer downwelling and autumn upwelling conditions by means of a transient 2-D kinematic box model. The subtidal circulation was positive in both situations, although it was depressed during downwel...

Abstract This study examines the larval development, metamorphosis and postlarval stage of Venerupis pullastra in relation to growth, lipids content and fatty acid composition, specifically those believed to be essential for most bivalves (i.e. 20:5n-3 and 22:6n-3). Clam larvae were fed with two species of microalgae supplied individually or mixed...

Closures of mussel rafts in the Ría de Ares–Betanzos (NW Spain) because of the occurrence of lipophilic shellfish poisoning outbreaks over the period 1999–2007 have been studied in relation to the coastal wind and precipitation regimes of the area. More than 85% of the episodes concentrate on the summer and autumn that coincide with the upwelling-f...

Over the last decades a large number of bivalve growth models were described in the literature with most emphasis on cultivated species with important economic value. These models describe the rates of energy absorption and utilization as a function of environmental conditions. Some of the most important issues in bivalve modelling are water pumpin...

Clearance rate (CR) response of Mytilus galloprovincialis was determined over 32 experiments in which the trophic conditions of its natural habitat, the Galician rías (Spain), were reproduced. Experimental diets were prepared by mixing pulverized sediment, Tahitian Isochrysis aff. galbana, and pulverized Spartina sp., avoiding multicollinearity amo...

Clearance rate (CR) response of Mytilus galloprovincialis was determined over 32 experiments in which the trophic conditions of its natural habitat, the Galician rías (Spain), were reproduced. Experimental diets were prepared by mixing pulverized sediment, Tahitian Isochrysis aff. galbana, and pulverized Spartina sp., avoiding multicollinearity amo...

Fish predation interferes with mussel seed population dynamic and is an important limiting factor on seed supply in several areas of mussel farming production. In the present study we assessed the impact of fish predation in a mussel farm sited in the Ría de Ares-Betanzos (Galicia, NW Spain). To assess fish impact on recruitment, we have quantified...

Clearance rate (CR) measurements in Mytilus galloprovincialis were determined over 16 experiments in which the mussels were exposed to diets characterized by variable chlorophyll content (0.28-104.88 μg Chla L-1) in order to: (1) establish the lower trigger level and the saturation reduction, (2) elucidate whether these thresholds were controlled b...

Clearance rate (CR) measurements in Mytilus galloprovincialis were determined over 16 experiments in which the mussels were exposed to diets characterized by variable chlorophyll content (0.28–104.88 µg Chla L–1) in order to: (1) establish the lower trigger level and the saturation reduction, (2) elucidate whether these thresholds were controlled b...