Juan Gil

Instituto Español de Oceanografia (IEO)

Resumen: En la plataforma continental del golfo de Cádiz, se ha encontrado evidencia de un escape fluido en forma de burbujas, a una profundidad de 50 m aproximadamente sobre un alto morfológico denominado Minas Tirith. Los datos obtenidos para la realización de este estudio, principalmente basados en la interpretación de datos acústicos (TOPAS y E...

This report presents the main findings of the “Transboun- dary population structure of sardine, European hake and blackspot seabream in the Alboran Sea and adjacent wa- ters” (Transboran) research project, which was carried out under the framework of the FAO regional project Cope- Med II and in close collaboration with the GFCM. The project applied...

Benchmark workshop 3 on development of MSY advice using SPiCT (WKBMSYSPiCT3) is the third effort to provide MSY advice for stocks previously assessed as category 3 stocks. Ten stocks, were initially included in the ToRs, pertaining to four ICES Assessment Working Groups (WGNSSK, WGDEEP, WGBFAS, and AFWG), were selected based on the availability of...

Investigations of population structuring in wild species are fundamental to complete the bigger picture defining their ecological and biological roles in the marine realm, to estimate their recovery capacity triggered by human disturbance and implement more efficient management strategies for fishery resources. The Blackspot Seabream (Pagellus boga...

The invasive seaweed Rugulopteryx okamurae has recently arrived in Europe from the western Pacific. Its explosive spread on coastal areas of the Gulf of Cádiz (GoC), Strait of Gibraltar and Alboran Sea is spoiling native coastal ecosystems and inflicting heavy losses on ecosystem services. We discovered for the first time large amounts (up to 17 g...

Species distribution models (SDM) are commonly used to identify potential habitats. When fitting them to heterogeneous, opportunistically collated presence/absence data, imbalance in the number of presence and absence observations often occurs, which could influence results. To robustly identify potential habitats for blackspot seabream (Pagellus b...

Length-based methods have been widely applied to estimate biological parameters and to understand the dynamics of marine resource populations within the category of data-limited stocks. However, few studies have been performed to date to test the parameter sensitivity of length-based methods on stocks with different traits and fishery contexts. In...

Length-based methods have been widely applied to estimate biological parameters and understand the dynamics of marine resource populations within data-limited stocks. However, to date few studies have tested the sensitivity of parameters in length-based methods examining stocks with different traits and fishery contexts. In the Bay of Biscay and th...

The blackspot seabream (Pagellus bogaraveo) is a benthopelagic fish species highly appreciated by consumers and an important target of the Spanish and Moroccan fisheries in the transcontinental waters of the Strait of Gibraltar area. It is also one of the most exploited resources of the region, which has led to a situation of overexploitation and a...

Evaluating the survival of discarded species is gaining momentum after the new European Common Fisheries Policy (Article 15 of the European Regulation No. 1380/2013). This regulation introduced a discard ban, with an exemption for those species with demonstrated high survival rates after their capture and release. Candidate species should be evalua...

Independence of science and best available science are fundamental pillars of the UN-FAO code of conduct for responsible fisheries and are also applied to the European Union (EU) Common Fishery Policy (CFP), with the overarching objective being the sustainable exploitation of the fisheries resources. CFP is developed by DG MARE, the department of t...

The Blackspot Seabream (Pagellus bogaraveo) is one of the most important commercially exploited fish species for the Spanish and Moroccan fleets which operate in the Strait of Gibraltar. In recent years, the landings of Blackspot Seabream in the main ports have decreased significantly with respect to previous periods of maximum catches, which makes...

Adequately assess the environmental effects on commercially exploited fish stocks is one of the main challenges faced by stock managers in their attempt to achieve ecosystemic management. In this study, we have developed a methodology which allows simulate the evolution of abundance or biomass of a fish population and calculate two indexes (the sig...

Long fisheries time series allow the review of baselines and inform our knowledge of past events that have conditioned the recent history of the stocks. In this study, we investigated trends in fisheries landings data for the most representative Atlantic and Mediterranean demersal fisheries off the Spanish Iberian Peninsula and the Balearic Islands...

Bottom trawling activity, commercial species and benthic and demersal assemblages were studied integrating Vessel Monitoring System data (VMS), fishing logbook data and otter trawl samples in a mud volcano (MV) field of the Spanish margin of the Gulf of Cádiz (GoC) in 2011. High trawling activity was detected around Anastasya MV and between the Cád...

ICES Scientific Reports/Rapports scientifiques du CIEM

In response to a request from the Spanish Ministry of Farming, Fishing, Food, and Environment (Spanish: Agricultura, Pesca, Alimentación y Medio Ambiente) in 2015, a fish expert group was formed to provide a reference list of marine fish species according to five regions (marine demarcations) established by Spanish Law 41/2010 on the protection of...

In this study we carried out an analysis of the relationship between the variation in environmental and oceanographic parameters and the changes in the abundance of blackspot sea bream (Pagellus bogaraveo) in the Strait of Gibraltar between 1983 and 2016. A discrete dynamic model was applied to simulate different scenarios of blackspot sea bream bi...

We assessed the potential for simulation and modelling of the blackspot seabream (Pagellus bogaraveo) population in the Strait of Gibraltar to discriminate the environmental effects of fishery impacts. A discrete biomass-abundance dynamic model was implemented to obtain a simulated monthly time series of blackspot seabream biomass. On this simulate...

Actualmente existe un acuerdo entre la mayoría de la comunidad científica, alrededor de la idea de que los sistemas de producción y consumo energético del ser humano están alterando rápidamente la variabilidad climática del planeta, ocasionando serios impactos sobre los sistemas naturales y socioeconómicos. Ante este contexto de rápido cambio climá...

This study was carried out from a series of samples obtained from the diapiric mud volcano system of the Guadalquivir River (Gulf of Cádiz) during the ARSA 0307 campaign. Five stations were sampled over depths ranging between 490 and 717 m. The main objective of this study is to provide a preliminary description of the infaunal communities living i...

According to the European Common Fisheries Policy (Regulation (EU) No 1380/2013), the objective of sustainable exploitation of marine biological resources is more effectively achieved through a multiannual approach to fisheries management, and hence multi-annual plans reflecting the specificities of different fisheries shall be adopted as a priorit...

Temporal fluctuation in fish stocks is a natural property of marine populations, which is mainly driven by the intrinsic demographic properties of populations and externally shaped by environmental factors, as well as human impact in harvested species. Understanding such fluctuations is crucial for improving the assessment of exploited marine resou...

Aim | The European Red List is a review of the conservation status of European species according to IUCN regional Red Listing guidelines. It identifies those species that are threatened with extinction at the regional level, so that appropriate conservation action can be taken to improve their status. This Red List publication summarises results fo...

Aim | The European Red List is a review of the conservation status of European species according to IUCN regional Red Listing guidelines. It identifies those species that are threatened with extinction at the regional level, so that appropriate conservation action can be taken to improve their status. This Red List publication summarises results fo...

Aim | The European Red List is a review of the conservation status of European species according to IUCN regional Red Listing guidelines. It identifies those species that are threatened with extinction at the regional level, so that appropriate conservation action can be taken to improve their status. This Red List publication summarises results fo...

El voraz (Pagellus bogaraveo) es una especie que se explota en la región del Estrecho de Gibraltar por flotas artesanales de Marruecos y España. Se presentan los resultados de la evaluación conjunta realizada en Noviembre 2014. Los resultados indicas clara sobre explotación del recurso. Blackspot seabream (P. bogaraveo) is a specie exploited by Mor...

An exceptional species richness for Mollusca was found on Avempace bank (349-365 m), Djibouti group, Alboran Sea, where the most abundant species was the crinoid Leptometra phalangium. A sample of sediment sieved on a 0.5-mm mesh yielded 156 species of molluscs (83 live-taken, 1772 specimens) with a high Shannon-Wiener diversity index (H'((log2))=3...

Presentation of assessment results of BLACKSPOT SEABREAM (PAGELLUS BOGARAVEO) OF THE STRAIT OF GIBRALTAR AREA

The Commission consults the STECF 'Working Group on fishing effort regime evaluations' on a review of fisheries regulated through fishing effort management schemes adopted in application of 1) the long term plan for cod stocks [R(EC) No 1342/2008], 2) the recovery plan for Southern hake and Norway lobster stocks in the Cantabrian Sea and Western Ib...

Deepwater fish are characterized by long lifespans, late maturity and low productivity. This implies slow recovery from low biomass levels and it is, therefore, important to manage these stocks correctly to avoid overfishing. However, these stocks are generally data poor, which it makes difficult to apply quantitative assessment models on which to...

This paper aims to investigate the potential interest of using a Vessel Monitoring System (VMS) based on GPRS/GSM (Global System for Mobile Communications) technology to obtain a better estimation of fishing activity and distribution of a small-scale artisanal fleet, for which the European satellite-based system is not available. Since the early 19...

The structure and composition of megabenthic epifauna from the mud volcano field known as El Laberinto and the nearby soft bottoms were analysed. Species abundance and biomass data were obtained from the Arrastre Región Sur-Atlántica bottom trawl surveys carried out routinely from 1993 to 2009. A high biodiversity of megabenthic epifauna was found...

Scientific interest in deep-water marine resources has increased dramatically over the last 10–20 years as management bodies have sought advice on how to manage deep-water fisheries and protect deep-water ecosystems. The strengths and weaknesses of the management and monitoring of deep-water stocks, fisheries, and ecosystems in various areas of the...

The second meeting of the FAO CopeMed II Working Group between Spain and Morocco on blackspot seabream (Pagellus bogaraveo) stock of the Strait of Gibraltar area2 was held in Tangier (Morocco) from 19 to 21 March 2012. The main objective of this CopeMed II Working Group was to update the existing data and information on this stock shared by the two...

Little is known about the feeding ecology of the deep-sea fish species inhabiting the Spanish waters of the Gulf of Cadiz. This information is of great interest to have better understanding about the food web structure within an ecosystem-based framework for fisheries management. In particular, the rabbit fish Chimaera monstrosa, is a very importan...

Maximum size of Atlantic mackerel (Scomber scombrus) and Atlantic chub mackerel (Scomber colias) in the Northeast Atlantic by María Rosario Navarro* (1), Begoña Villamor (1), Sigmund Myklevoll (2), Juan Gil (3), Pablo Abaunza (1) & Jesús Canoura (3) (1) I nstituto Español de Oceanografía (IEO), Promontorio San Martín S/N, 39004 Santander, Spain....

The Gulf of Cádiz is an area with a high faunistic biodiversity due to the coexistence of species from different biogeografical regions (Lusitanian, Mediterranean, Mauritanian). The natural distribution of these species includes latitudinal (African and north Atlantic species) or longitudinal gradients (Mediterranean and anfiatlantic species). Info...

I_Marco_General_Sudatlantica_tcm7-203272.pdf

Living specimens of the amphi-Atlantic asteroid Hacelia superba have been collected in different areas of Gazul mud volcano in the Gulf of Cadiz, south-western Iberian Peninsula, at depths of 380–487 m. This starfish displayed low abundances (~1 ind. 2000 m−2) in beam trawl catches on the mud vulcano and adjacent soft bottoms. The absence of previo...

The occurrence of the lophogastrid crustacean Lophogaster spinosus is reported for the Gulf of Cadiz waters, in the North-East Atlantic. This constitutes the first report of the species for the Iberian Atlantic region. Samples were collected by demersal trawling during a fisheries research survey performed in March 2008. A total of four specimens w...

Lorance, P., Agnarsson, S., Damalas, D., des Clers, S., Figueiredo, I., Gil, J., and Trenkel, V. M. 2011. Using qualitative and quantitative stakeholder knowledge: examples from European deep-water fisheries. – ICES Journal of Marine Science, 68: 1815–1824. Stakeholder knowledge was collected through questionnaires and cognitive maps and used to su...

The classification and identification of all the Spanish fishing activity targeting deep-sea species was conducted using a non-hierarchical classification technique designed for large matrices (CLARA). Otter trawl and set longlines were the main gears used in deep-sea ecosystems. The otter trawl fleet conducted 3 deep-sea fishing tactics. The only...

—The present paper reports for the first time for Mozambique waters the distribution, abundance and species assemblages of cephalopods in the outer shelf and upper/middle slope (100 – 700 m depth) from data collected in spring of 2007 during the “Mozambique 0307” bottom-trawl survey. A total of 129 hauls were performed following a random stratified...

Nowadays many different marine animals are being tagged. This book summarizes recent tagging programs carried out by the Spanish Institute of Oceanography (IEO). Although the objectives of these various studies mainly depend on the species and each project in particular, the general aim is to better understand the biology and ecology of these anima...

The capture of a specimen of Polymixia nobilis, a rare species in the eastern Atlantic waters north of the Canary and Madeira Islands, is reported as the first record in the vicinity of the Strait of Gibraltar.

The capture of a specimen of Selene dorsalis in the Chipiona (southern Spain), a rare species in waters north of the Cape Verde Islands and Senegal, is reported as the first record in the Gulf of Cadiz.

The Working Group on Nephrops Stocks [WGNEPH] met in Lisbon, Portugal, from 28 March–1 April 2004 to: a) assess the status of Nephrops stocks in the Bay of Biscay (FUs 23-24) and around the Iberian Pensinsula (FUs 25, 26-27, 28-29, 30 and 31), utilising new data where available, revising catch options only where necessary; b) evaluate the extent to...

The Spanish artisanal fishery in the Gulf of Cádiz is of a notably multi-gear and multi-species nature, with target species occurring seasonally, where a fleet composed of about 1000 vessels captures more than 50 commercial species. From this complexity arises the need for defining fleet components (FCs) (i.e., groups of vessels developing the same...