Pablo Sanchez-Jerez's research while affiliated with University of Alicante and other places

Publications (213)

Article
Pollock Pollachius virens modify their feeding habits when including in their diet uneaten feed pellets from salmon aquaculture sea cages. To determine the influence of salmon farms on Pollock, multivariate and univariate analyses were conducted on the trace element signatures from muscle and liver tissues. Sample fish were caught in the vicinity o...
Article
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Sea lice infestations have been a major problem for the global salmon farming industry for several decades. To date, few studies have addressed the measurement of lice abundance in plankton samples and a standardized method to quantify sea lice larvae in water samples is still lacking. This study aims to: (1) evaluate the methods used to detect sea...
Article
The COVID-19 global pandemic has had severe, unpredictable and synchronous impacts on all levels of perishable food supply chains (PFSC), across multiple sectors and spatial scales. Aquaculture plays a vital and rapidly expanding role in food security, in some cases overtaking wild caught fisheries in the production of high-quality animal protein i...
Article
The warming of the Mediterranean Sea surface is currently estimated to have been 0.4°C per decade for the period 1985-2006, and the increase in water temperature may have negatively affected marine aquaculture, e.g. by decreasing productivity. Development of aquaculture without adequate planning can lead to unsustainable economic feasibility due to...
Article
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Artificial structures can be considered as high spatially structured habitats in the marine pelagic system, where patch connectivity would be strongly dependent on the exchange of larvae or dispersing individuals. Fish-farms located offshore may alter ecological connectivity, modifying trophic resources, and species dispersal among patches. High po...
Article
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Marine aquaculture takes advantage of marine ecosystem services to produce goods that can be relevant from a food security point of view. However, this activity is subject to multiple stressors as the ones exerted by global climate change. Local stressed conditions due to environmental drivers may be exacerbated by the COVID19 pandemic crisis. In t...
Article
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Marine aquaculture releases mollusc shell debris which can accumulate on the seabed. Due to its low degradability, mollusc shell debris becomes integrated into the sediment, modifying both its structure and associated biogeochemical processes. These changes are expected to influence the biological assemblages within the sediment, which play a key r...
Article
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Environmental genomics is a promising field for monitoring biodiversity in a timely fashion. Efforts have increasingly been dedicated to the use of bacteria DNA derived data to develop biotic indices for benthic monitoring. However, a substantial debate exists about whether bacteria‐derived data using DNA metabarcoding should follow, for example, a...
Article
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The rapid, global spread of COVID-19, and the measures intended to limit or slow its propagation , are having major impacts on diverse sectors of society. Notably, these impacts are occurring in the context of other anthropogenic-driven threats including global climate change. Both anthropogenic stressors and the COVID-19 pandemic represent signifi...
Article
Full-text available
The rapid, global spread of COVID-19, and the measures intended to limit or slow its propagation, are having major impacts on diverse sectors of society. Notably, these impacts are occurring in the context of other anthropogenic-driven threats including global climate change. Both anthropogenic stressors and the COVID-19 pandemic represent signific...
Article
Escape incidents of farmed fish involve economic losses to fish farms, interactions with local fisheries and environmental impacts to coastal ecosystems. In order to ensure a sustainable aquaculture activity it is advisable to gather any kind of information about the escapees for further management strategies. In this study, we aimed to trace the l...
Article
Aquaculture sustainability is restricted by environmental drawbacks such as the pollution derived from the released organic waste. Integrated multi-trophic aquaculture (IMTA) aims to lower the input of this waste by culturing other species of low trophic level which feed on them. Despite the appealing idea of IMTA, its implementation is very limite...
Article
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Artificial reefs (ARs) have become an important tool to increase the ichthyofauna associated with artisanal and commercial fishing. Integrated evaluations of ARs are necessary to comprehend the condition and benefits of these structures. Multimetric indices (ARMIs) were developed to evaluate fish assemblages associated with artificial structures an...
Article
It is essential from both the consumer perspective and the environmental sustainability aspect, to delve more deeply into the specific traits and conditions of fish reared in a pisciculture setting. Among the many factors that affect the latter, one of the most important is the cycling of chemical compounds in intensive rearing systems. For this re...
Article
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Artificial reefs (ARs) have been used globally to increase fish stocks, especially for local fisheries, but few studies have addressed the seasonal changes in fish attracted to ARs over extended periods. Bottom gillnets were used twice a year (wet versus dry seasons) to investigate how the composition and structure of fishing resources change over...
Article
Marine sediments are a major sink of organic matter, playing a crucial role in the global cycling of major elements. Macrofauna, through the reworking of particles and movement of solutes (bioturbation), enhances oxic conditions and the sediment metabolic capacity. Increases in the inputs of organic matter can lead to profound changes in the seabed...
Article
Wild fish belonging to four species belonging to different trophic groups were captured at three distances from fish farm facilities: long distance (>5 Km), medium distance (1.5 Km) and close to sea-cages. Flesh, brain, liver and gonads were sampled for fatty acid analysis. Fish aggregated near sea-cages showed accumulation of fatty acids of vegeta...
Article
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Salmon farms attract large amounts of wild fish, which prey on uneaten feed pellets. The modified diet of the wild fish aggregating at salmon farms may reduce the flesh quality of the fish, influencing the local fisheries. We compared the quality of saithe (Pollachius virens) captured near (farm associated—FA) or more than 5 km away (un‐associated—...
Article
Microsatellite markers were used to investigate the genetic structure of the two most important cultured fish in the Mediterranean Sea, the gilthead seabream ( Sparus aurata ) and the European seabass ( Dicentrarchus labrax ), from two (one wild and one farmed) populations in Western Mediterranean (Spain) and from two (one wild and one farmed) popu...
Article
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Aquaculture is the world's fastest growing food-producing sector and currently the main source of fish supply. However, environmental sustainability is one of the main challenges faced by the industry, in particular the inevitable occurrence of fish escapes, which are considered a major threat to marine ecosystems. Here we evaluated the risks assoc...
Article
In this study, we assessed plastic accumulation in marine sediments due to finfish aquaculture using floating net-pens. We studied plastic concentrations around three fish farms located at the Mediterranean coastline of Spain. The macroplastic categories and abundances were determined by video monitoring, detecting the majority of elements (78%), i...
Article
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Fish farm facilities become colonized by biofouling, and in situ cleaning activities may increase the accumulation of biofouling, mostly shell-hash, on the sediment. However, there is a lack of knowledge about the effect of fish farming on this process. We evaluated the effect of fish farming on shell-hash accumulation on sediments in three fish fa...
Article
A range of different protocols and indices have been developed in recent years for the definition of Environmental Quality Standards in aquaculture. However, it can be difficult to compare these protocols or indices between different regions or different habitats due to spatial heterogeneity at different scales. We carried out a field study to esti...
Article
Changes in bacterial assemblages along an environmental gradient determined by the distance to aquaculture installations were analysed, using denaturing gradient gel electrophoresis to assess the influence of fish farming on marine sediments. Our findings show that changes in the structure of the bacterial community are a useful indicator for deter...
Article
The present study describes the novel use of fatty acids (FAs) and element profiles of Octopus vulgaris inhabiting three coastal areas in the W-Mediterranean Sea. These populations are exposed to different anthropogenic activities , and were compared at different geographical scales. The FA composition in the mantle of O. vulgaris exhibited signifi...
Article
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Bivalve cultivation, in single cultivation or in polyculture (including integrated multitrophic aquaculture; IMTA), is generally limited to eutrophic waters. We carried out a modeling study to test if, under meso- and oligotrophic conditions, depth could be a key factor for bivalve productivity associated to IMTA and other polyculture strategies. W...
Presentation
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In the last 70 years or so, the proliferation of plastic products has been excessive, causing immense damage to the marine ecosystem. Nearly 300 million tons of plastic are produced every year, of which more than 8 million tons end up in the oceans. Plastics are designed to last for a very long time, which helps them remain in marine sediments. Mor...
Conference Paper
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In recent years the FAO Fisheries and Aquaculture Department has been carrying out strategies and policies aimed at improving the regulatory laws on aquaculture and fisheries activities for increasing both the management efficiency and environmental protection associated to this task. In this field, the role of temporal and geo-spatial analysis of...
Article
Gilthead sea bream and European sea bass aquaculture is widely established in the Mediterranean and North-eastern Atlantic regions, and rearing is mainly in coastal net-pen facilities. The rapid growth of the fish farming industry increases the potential number of farmed fish in the wild. Escape-related issues are likely to increase unless escape-m...
Article
Farmed fish that escape and mix with wild fish populations can have significant ecological and genetic consequences. To reduce the number of escaped fish in the wild, recapture is often attempted. Here, we review the behaviours of escapees post-escape, and how recapture success varies with escaped fish size, the size of the initial escape event and...
Article
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The Spanish National Advisory Board of Mariculture (JACUMAR) developed an initiative to unify methodologies between the regions of Spain, in which they proposed the implementation of site-specific “Environmental Monitoring Plans” (EMPs). In this study, we tested the feasibility of an EMP on a fish farm in the Mediterranean Sea. The methods and tool...
Article
Current trends in aquaculture research are towards more sustainable aquaculture, implementing more environment-friendly models such as integrated multi-trophic aquaculture (IMTA) systems. One possible IMTA strategy involves taking advantage of the species that naturally grow on aquaculture facility structures. Since amphipods have been cultured on...
Article
The rapidly expanding Atlantic bluefin tuna fattening industry is characterized by high stock densities and a high input food biomass in the form of whole bait seafood. The environmental impact of this activity must be effectively monitored within a proper sustainable development framework, to address concerns about the potential adverse effects. H...
Article
Escape incidents of farmed fish involve economic losses to fish farms, interactions with local fisheries and environmental impacts to coastal ecosystems. More attention should clearly be paid to preventive measures. It is also essential to develop and establish contingency plans in case of escapes, to mitigate potentially negative socioeconomic and...
Article
Differences in magnitude and spatial extent of impact of three tuna farms located in Malta on polychaete and amphipod assemblages associated with soft sediment habitat were assessed using a hierarchical spatial design that incorporated different spatial scales, from tens of metres to a few kilometres. Spatial variation in impact was significant at...
Article
Particulate wastes derived from cage fish farming are a trophic resource used by wild fish. This study assesses waste consumption by wild fish and the impact on the final balance of wastes. Consumption was determined according to the difference between the particulate matter exiting the cages and that reaching 5 m away at three different depths, in...
Article
The overall impact of tuna farming on soft-bottom habitat was assessed at three tuna farms over a period of 3 years, using benthic macroinvertebrates as indicators. Polychaetes and amphipods served as better indicators of the impact of tuna farming compared with molluscs and decapods. Lower number and Shannon–Wiener diversity of polychaete and amph...
Article
Particulate wastes drive benthic organic enrichment from cage fish farming. Differentiation between faeces and uneaten feed estimates at cage level are of great value to both economize the feeding process and reduce waste. This study estimates the particulate waste outflowing cages at different depths and orientations, and the wasted feed component...
Article
Aquaculture facilities provide a suitable habitat for a wide group of marine species that are able to colonise and settle on artificial structures. This study aims to determine the composition of fouling communities in off-coast facilities, with special emphasis on motile epifauna and amphipods as a main group. Seventeen aquaculture sites were samp...
Article
Gilthead sea bream (Sparus aurata L.) aquaculture has rapidly spread around the Mediterranean Sea. Fish escapes from sea cages are one of the major problems for the industry and also represent a threat to the marine environment. Fishery catches are also influenced by escape events, being mirrored in increased landings of cultured species. However,...
Article
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Fish farms commonly support high abundances of invertebrates, especially amphipods, associated with fouling communities developed over nets, ropes and buoys. Protozoan epibiont ciliates of the genus Conidophrys were observed on three of the most abundant amphipod species collected from ropes of a fish farm in the western Mediterranean Sea. The amph...
Article
Gilthead sea bream (Sparus aurata) usually chew their feed before swallowing it. Under rearing condition, this feeding behaviour generates significant feed waste in the form of pellet fragments. The study aimed to experimentally quantify feed losses by chewing considering fish weight and the feed pellet size. Gilthead sea bream with a body weight o...
Article
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Trace elements in otoliths of sea bass (Dicentrarchus labrax L.) and sea bream (Sparus aurata L.) from fish farms and coastal wild populations in the western Mediterranean Sea were analysed by inductively coupled plasma-mass spectrometry. Results showed that concentrations of Mg, K, and Mn differed significantly between wild and farmed sea bass, wh...
Article
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Organic fish farming is postulated as a more environmentally friendly activity than conventional activities. However, environmental sustainability as regards waste output has not been addressed. In this respect, the most important environmental problems associated with fish farming are those related with the discharge of particulate wastes. In this...
Article
Organic pollution is widespread in coastal areas and can have profound impacts on the seabed. Coastal sediments play an important role at a global scale in the recycling of organic matter, and this process is influenced by the habitat complexity of the sediments, among other factors. Mollusc shells are produced as a waste product from a range of an...
Poster
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Current aquaculture activities imply the use of aquafeeds with high inclusions of vegetable oils of terrestrial origin. These vegetable oils are rich in n-6 polyunsaturated fatty acids but scarce in n-3 long-chain polyunsaturated fatty acids, which are essential for marine teleost and generally abundant in marine organisms. The submerged structure...
Article
Fish escaping from net pens have always been considered a major source of socioeconomic and ecological issues entitling high economic loses for farmers. Local artisanal fisheries have proved the ability to mitigate escape events by recapturing escapees, but its effectiveness has always been questioned. However, the knowledge regarding the interacti...
Article
Organic loading from fish farming constitutes a significant disturbance to marine sediment, normally reducing species abundance and richness and creating disturbed patches in soft-bottom communities. In contrast, floating fish farms harbour a high abundance of invertebrates associated with fouling communities, particularly amphipods. Changes in mac...
Article
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Aquaculture is an increasingly important food-producing sector, providing protein for human consumption. However, marine aquaculture often struggles for space due to the crowded nature of human activities in many marine coastal areas, and because of limited attention from spatial planning managers. Here, we assess the need for coastal spatial plann...
Article
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Aquaculture impacts on wild populations of fish have been considered principally due to farm escapes. The Bluefish Pomatomus saltatrix, which exhibits two distinct genetic units in the Mediterranean Sea, is a voracious predator and is attracted to aquaculture cages to prey on farmed fish, particularly Gilthead Seabream Sparus aurata and European Se...
Article
Meagre (Argyrosomus regius) is an emerging species in aquaculture considered a locally absent species in the Western Mediterranean. Little is known about meagre escape incidents from farms. To evaluate escape impacts and develop mitigation measures, knowledge about the behaviour of escaped meagre is necessary. In this study, a rapid dispersion of e...
Article
A metabolomics approach was used to analyze effects of salmon farming on wild saithe (Pollachius virens) populations. Saithe fish were captured at two salmon farms and at two control locations around the island Hitra, Norway. At each location the fish were captured with either benthic gillnets and automatic jigging machines. Changes in diet seem to...
Article
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The aggregation of wild fish around fish farms is spatially and temporally variable in terms of species composition and structure. In general, temporal variability has been less well studied than the spatial aspect of these aggregations. We analyzed temporal variability at different scales following a hierarchical sampling design, with year, season...
Conference Paper
Full-text available
Gilthead sea bream (S. aurata) uses to chew the feed before swallowing it. Under rearing condition, this feeding behaviour generates significant feed wastes as pellet fragments. We aimed to experimentally quantify feed losses by chewing (LbC) considering the fish weight (Fw) and the size of supplied pellet (Ps). Gilthead sea bream within a body wei...
Poster
Full-text available
Fish farms commonly support high abundances of invertebrates, especially amphipods, associated with fouling communities developed over nets, ropes and buoys. Two protozoan epibiont ciliates of the genus Conidophrys were observed on two of the most abundant amphipod species collected from ropes of a fish farm in the western Mediterranean Sea. Specim...
Article
Sediment grain size plays a major role in sediment biogeochemistry and sediments with different grain size are expected to react differently to organic enrichment. Through a mesocosm approach we tested the behavior of sediments with two types of predominant grain size (sandy and muddy sediments) under two levels of organic enrichment, related to mu...
Article
Escape incidents in coastal aquaculture lead to economic losses for farmers and may have indirect socioeconomic effects on local fisheries. In this study, the relationship of meagre, Argyrosomus regius (Asso), production in open-sea cages and coastal small-scale fisheries was analysed through captures of escapes, which are easily detected because t...
Article
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Effective ecosystem-based management requires understanding ecosystem responses to multiple human threats, rather than focusing on single threats. To understand ecosystem responses to anthropogenic threats holistically, it is necessary to know how threats affect different components within ecosystems and ultimately alter ecosystem functioning. We u...
Article
Off-shore fish cages are new artificial habitats that can affect pelagic fish assemblages and constitute an important food source for wild fish assemblages. This aggregation has noticeable ecological consequences in cage areas in impoverished ecosystems such as those in the Canary archipelago (NE Atlantic Ocean). However, this new habitat could be...
Article
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Saithe Pollachius virens are attracted to uneaten salmon feed underneath cages at open-cage salmon farms in Norway. The aggregated Saithe have modified their feeding habits as they have switched from wild prey to uneaten food pellets, which could lead to physiological and biochemical changes in the Saithe. Variations in profiles of total lipids, fa...
Article
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Salmonid farming affects both the environment and other industries, with impacts of wild fish attracted to fish farms being a major concern. Here, we summarized existing knowledge on the impacts of such aggregations around open-cage salmonid farms in Norway on the environment and human activities and on the interactions of these impacts. Waste fish...