Pablo Sánchez-Jérez

University of Alicante

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Just T. Bayle‐Sempere

University of Alicante

Pablo Arechavala‐Lopez

Mediterranean Institute for Advanced Studies

Damian Fernandez‐Jover

University of Alicante

Victoria Fernández-González

University of Alicante

David Izquierdo-Gómez

Nofima

Carlos Valle

University of Alicante

Kilian Toledo‐Guedes

University of Alicante

Ricardo Haroun

Universidad de Las Palmas de Gran Canaria

Tim Dempster

University of Melbourne

Fernando Tuya

Universidad de Las Palmas de Gran Canaria

Cooperative Institutions

University of Alicante

Universidad de Murcia

Centre National de la Recherche Scientifique

Norwegian Institute of Marine Research

Instituto Español de Oceanografía

Universidad de Las Palmas de Gran Canaria

University of Palermo

Observatoire Océanologique de Banyuls-sur-Mer

Universidad de La Laguna

Norwegian University of Science and Technology

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Attraction of wild fish to sea-cage fish farms in the south-western Mediterranean Sea: spatial and short-term temporal variability

Marine Ecology Progress Series (2002)

Tim Dempster Pablo Sánchez-Jérez Just T. Bayle‐Sempere Francisca Giménez Casalduero Carlos Valle

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 242:237-252 (2002) - doi:10.3354/meps242237 Attraction of wild fish to sea-cage fish farms in the south-western Mediterranean Sea: spatial and short-term temporal variability Tim Dempster1,*, Pablo Sanchez-Jerez2, Just T. Bayle-Sempere2, Francisca Giménez-Casalduero2, Carlos Valle2 1School of Biological Sciences, University of Sydney, New South Wales 2006, Australia 2Unidad de Biología Marina, Departamento de Ciencias Ambientales y Recursos Naturales, Universidad de Alicante, Ap.C. 99, 03080 Alicante, Spain *E-mail: dempster@bio.usyd.edu.au ABSTRACT: Aggregations of wild fish were counted around 9 floating sea-cage fish farms along a 300 km stretch of the Spanish coastline in the south-western Mediterranean Sea. Each fish farm cultivated Sparus aurata and Dicentrarchus labrax in 6 to 16 floating sea cages between 10 m and 7.4 km from the coast. During September and October 2001, assemblages of fish were counted on 3 separate days at each of 9 farms. Six 5 min rapid visual counts using SCUBA and covering 11250 m3 were performed within each farm complex and at open water control sites 200 m distant from farms. Abundance (52 to 2837x), biomass (2.8 to 1126x) and number of species (1.6 to 14 x) were greater in fish farm counts than control counts at all locations. Twenty-seven species were recorded at fish farms, with 2 families, Sparidae (12 species) and Carangidae (4 species), being particularly abundant. Over 85% of farm-associated fish were of adult size. Assemblages of wild fish differed greatly between farms separated by 10s to 100s of km, although there was some evidence to suggest that similar assemblages occur at farms separated by 100s of m to several km. Abundance, biomass and number of species differed among fish farms, with all 3 variables negatively correlated with distance of farms from shore and positively correlated with size of farms. Limited variability of wild fish assemblages and abundance of the dominant taxa at each farm among times sampled indicated some degree of temporal stability on a scale of several weeks. Due to the strong aggregative effect of fish farms, possible residence of fishes for periods of weeks to months and the prohibition of fishing within farm leasehold areas, we suggest that coastal sea-cage fish farms may act as small (up to 160000 m2), pelagic marine protected areas (MPAs). Furthermore, at farms where wild fish are abundant, ecological interactions that may influence both wild fish stocks and the impact of farms must be considered. KEY WORDS: Aquaculture · Wild fish · Fish farm · Sea-cage · Fish Aggregation Device · Marine Protected Area · Mediterranean Sea Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 242. Online publication date: October 25, 2002 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2002 Inter-Research.

Sparidae

10.3354/meps242237

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Citations (236)

Comparing the Structure of Fish Assemblage among Natural and Artificial Shallow Rocky Habitats

Oceans (2024)

Laura García-Salines Pablo Sánchez-Jérez

Artificial coastal structures, such as seawalls, breakwaters, and groins, can exert various impacts on the fish communities in the nearby regions. This study focuses on assessing the ecological effects of coastal infrastructure on marine environments, by comparing, at different seasons, the habitat complexity and heterogeneity, as well as their effects on fish assemblages, between the artificial habitat created with the intention of constructing a marina (Puerto Amor) and the natural habitats surrounding the Cabo de la Huerta area in Alicante (Spain). Employing an asymmetric design and examining two temporal and spatial scales, we utilized visual censuses in snorkeling to gauge the abundance and size of fish species, alongside various parameters related to habitat complexity and heterogeneity. The overarching hypothesis is that fish populations associated with artificial habitats will differ in terms of abundance, biomass, species richness, and diversity compared to fish populations associated with natural habitats, due to changes in complexity and heterogeneity. The findings indicate a shift in fish assemblages; for example, the family Labridae showed differences between the two habitat types for several species. These changes were due to the influences of the Posidonia oceanica meadow and algae like Jania rubens; being influenced by biological variables such as Ellisolandia elongata, Oculina patagonica, and Sarcotragus spinosulus; as well as physical variables such as stones, gravel, and blocks. While there is evidence of alteration in fish assemblages due to changes in habitat structure, there is also an increase in richness (9 species/m2) and total abundance and biomass (1000 ind./m2 and 1700 g/m2, respectively) in the artificial habitat. Multivariate analyses reveal that the fish community in Puerto Amor is less homogeneous than the one in the natural habitat. However, these analyses also indicate an overlap between the communities of both habitats, suggesting substantial similarity despite the noted differences. Consequently, although the habitat alteration has impacted fish populations, it has not diminished abundance, biomass, or species richness. In conclusion, the artificial rocky habitat resulting from the construction attempt at Puerto Amor harbor has fish populations with ecological significance and its removal could lead to undesirable impacts in the area, as the fish assemblages have become well established.

Assemblage (archaeology)

10.3390/oceans5020015

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Vertical variability of wild fish assemblages around sea-cage fish farms: implications for management

Marine Ecology Progress Series (2005)

Tim Dempster Damian Fernandez‐Jover Pablo Sánchez-Jérez Fernando Tuya Just T. Bayle‐Sempere

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 304:15-29 (2005) - doi:10.3354/meps304015 Vertical variability of wild fish assemblages around sea-cage fish farms: implications for management Tim Dempster1,*, Damian Fernandez-Jover2, Pablo Sanchez-Jerez2, Fernando Tuya3, Just Bayle-Sempere2, Arturo Boyra3, Ricardo J. Haroun3 1SINTEF Fisheries and Aquaculture, 7465 Trondheim, Norway2Unidad de Biologia Marina, Departamento de Ciencias del Mar y Biologia Aplicada, Universidad de Alicante, Ap.C. 99, 03080 Alicante, Spain3BIOGES, Department of Biology, Faculty of Marine Sciences, University of Las Palmas de Gran Canaria, 35017 Las Palmas, Spain *Email: tim.dempster@sintef.no ABSTRACT: Wild fish were counted in 4 depth-related strata (bottom, midwater, cage and surface) around 3 floating sea-cage fish farms (Altea, Campello, Guardamar) along the Spanish coastline and 2 farms (Los Cristianos, San Andrés) in the Canary Islands. Almost 200000 wild fish belonging to 53species were seen; representatives of Sparidae (8 species), Carangidae (6 species), Mugilidae (5species) and Chondrichthyid rays (7 species) were commonly observed. At all 5 farms, 1 to 3 taxa accounted for >74% of the abundance and >94% of the biomass of aggregated wild fish. Abundances (5.7 to 162 times) and biomasses (42 to 1728 times) of wild fish were higher in the cage stratum at the 3 Mediterranean farms than at the bottom. In contrast, abundances and biomasses of wild fish at the Canary Island farms were highest at the bottom at San Andrés and highest at the surface at Los Cristianos. Large differences in the sizes of associated fish existed among farms, with low percentages of fish >20 cm total length at Guardamar, Los Cristianos and San Andrés (11 to 25%) compared to Altea and Campello (81 to 95%). However, the greatest proportions of large fish were present in the cage stratum at each of the 5 farms. This variability suggests that assemblage structure and aggregated biomass of wild fish at farms cannot be predicted prior to their installation, causing uncertainty in modelling of nutrient dispersal. Further, the sedimentation 'footprint' of temperate sea-cage fish farms may vary depending on (1) the species and biomass of associated wild fish, and (2)where these fish are distributed in the water column. As wild fish consume lost feed and assimilate nutrients, we suggest that coastal managers prohibit fishing of large planktivorous species at farms to fully harness their ability to ameliorate benthic impacts. KEY WORDS: Aquaculture · Fish farm · Wild Fish · Impact · Assemblage · Management · Mediterranean Sea · Eastern Atlantic Full text in pdf format Supplementary Appendix PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 304. Online publication date: December 08, 2005 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2005 Inter-Research.

Sparidae

Cage

Carangidae

10.3354/meps304015

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Citations (90)

Multivariate analysis of the bentho-demersal ichthyofauna along soft bottoms of the Eastern Atlantic: comparison between unvegetated substrates, seagrass meadows and sandy bottoms beneath sea-cage fish farms

Marine Biology (2005)

Fernando Tuya Arturo Boyra Pablo Sánchez-Jérez Ricardo Haroun

Demersal fish

Diplodus

Demersal zone

Sparidae

Canonical correspondence analysis

10.1007/s00227-005-0018-1

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Citations (56)

Role of fish farm fouling in recolonisation of nearby soft-bottom habitats affected by coastal aquaculture

Journal of Experimental Marine Biology and Ecology (2015)

Victoria Fernández-González Elena Martínez-García Pablo Sánchez-Jérez

10.1016/j.jembe.2015.10.019

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Citations (11)

Estructura poblacional y distribución espacial de los moluscos gasterópodos del género Osilinus en el intermareal rocoso de las Islas Canarias (Atlántico centr-oriental)

Rubén Ramírez Cañada R. Jaraiz Pablo González Navarro Cristina Fernández Gil Fernando Tuya

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Peces, erizos y algas en fondos rocosos someros de Canarias : ¿Tenemos evidencia de una cascada trófica?

Fernando Tuya Pablo Sánchez-Jérez Arturo Boyra Ricardo Haroun

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Changes in Fish Assemblages Associated with the Deployment of an Antitrawling Reef in Seagrass Meadows

Transactions of the American Fisheries Society (2000)

Pablo Sánchez-Jérez Alfonso A. Ramos‐Esplá

Posidonia oceanica seagrass meadows have been degraded in the Mediterranean Sea by trawling. To reduce this impact, antitrawling artificial reefs have been deployed. The introduction of artificial structures on seagrass meadows, however, could potentially change the composition of fishes. Using visual techniques, we examined changes in fish assemblage and density of key species by comparing fish abundances at four seagrass sites with and without artificial reef blocks in El Campello (Alicante), southeastern Spain, between October 1992 and August 1995. The fish assemblage on plots with artificial reefs changed substantially a year after their installation in October 1992. Differences in fish abundance (total counts of 6,692 fish on artificial reefs and 3,565 fish on Posidonia) and in species richness (41 species on artificial reefs and 29 on Posidonia) were found. The abundance of key species were quite different between habitats. Diplodus vulgaris and Chromis chromis were most abundant in all samples, whereas Oblada melanura recruited to the artificial reefs during winter 1994. Two species, Apogon imberbis and Sciaena umbra were found at all times on artificial reefs but were not present in P. oceanica plots. The antitrawling artificial reefs influenced the spatial distribution of fishes on a scale of tens to hundreds of meters but did not affect the overall Posidonia fish assemblage. Antitrawling artificial reefs protect seagrass from trawling and had little overall effect on seagrass fish assemblages in areas away from the artificial reefs.

Artificial reef

Posidonia oceanica

10.1577/1548-8659(2000)129<1150:cifaaw>2.0.co;2

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Citations (24)

Fish dispersal from a sabotage-mediated massive escape event

Aquaculture Environment Interactions (2024)

Javier Atalah Pablo Sánchez-Jérez David Izquierdo Damian Fernandez‐Jover Pablo Arechavala‐Lopez

Farm sabotage can cause massive fish escape events with significant ecological and socio-economic risks. This study examined the fate of Mediterranean seabass Dicentrarchus labrax escapees following a large-scale escape event caused by sabotage in the Western Mediterranean Sea. We monitored the escapee density and size structure over 3 mo after the escape at increasing distances from the escape point, up to 45 km away. Fish density adjacent to the escape location 5 d after the sabotage was, on average, 114 ± 44.7 (SE) fish per 100 m 2 . Our analyses showed that fish density decreased by 17% for every km away from the location, dropping to 2 and 1% after 1 and 2 mo, respectively, following the escape event. As escapee density declined throughout time and space, the size distribution of seabass shifted towards larger sizes. The rapid decrease in fish densities highlights the need for contingency plans focusing on fishing efforts in the coastal areas near the escape location (<20 km) within the first 24 h. These results are paramount to mitigating the risks associated with escape events cost-effectively. We emphasise the importance of sabotage prevention measures, such as security systems that can quickly detect intruders and trigger an immediate response to deter them. Additionally, enforcing appropriate sanctions based on the severity of the damage caused could help to discourage future sabotage attempts.

10.3354/aei00482

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Citations (1)

Coastal Resources Exploitation can Mask Bottom–up Mesoscale Regulation of Intertidal Populations

Hydrobiologia (2005)

Fernando Tuya Rubén Darío Montoya Ramírez Pablo Sánchez-Jérez Ricardo Haroun Antonio G. Ramos

Intertidal ecology

Rocky shore

Archipelago

10.1007/s10750-005-1246-6

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Citations (25)