Non-native Fish Species Research Articles

Facilitation underpinning the success of the non-native catfish Hoplosternum littorale (Callichthyidae) in lakes of the Middle Doce River Basin, southeastern Brazil

Facilitation is defined as an interaction between two or more species, which benefits at least one of them and causes harm to neither. The establishment of non-native species in new areas is a global phenomenon that raises the question of how facilitation may help in successful biological invasions. We describe a possible facilitation process between the catfish Hoplosternum littorale (Tamboatá) and its predators: Pygocentrus nattereri (piranha) and Cichla cf kelberi (tucunaré), all non-native fish that live in the lakes of the Middle Doce River Basin, southeastern Brazil. We found evidence of indirect facilitation, where non-native predators probably release H. littorale from competition, as they prefer to prey on native fish. Our main evidence in favor of this interpretation was a difference in the abundance of H. littorale between lakes where these species co-occur and lakes where H. littorale is the only non-native fish species. This difference was not associated with environmental differences between lakes or spatial segregation of age classes of H. littorale. Differences in peak activity among H. littorale and non-native predators are probably the main driver of co-occurrence.

Loss of biodiversity in a conservation unit of the Brazilian Atlantic Forest: the effect of introducing non-native fish species.

The introduction of species has become an important problem for biodiversity and natural ecosystem conservation. The lake system of the middle Rio Doce (MG, Brazil) comprises c. 200 lakes at various conservation states, of which 50 are located within the Rio Doce State Park (PERD). Previous studies had verified several of these lakes suffered non-native fishes introductions and the presence of these species needs for the implementation of actions aiming at not only their control but also the preservation of the native species. This study discusses the effects of non-native fish species in the largest conservation unit of Atlantic Forest in Minas Gerais, southeast of Brazil, using data from 1983 to 2010 distributed as follow: data prior to 2006 were obtained from previous studies, and data from September 2006 to July 2010 were obtained in Lake Carioca at four sampling stations using gillnets, seine nets and sieve. A total of 17 fish species was collected (2006-2010) of which five were introduced species. Among the small to medium size native species (30 to 2000 mm standard length) seven had disappeared, two are new records and one was recaptured. The non-native species Cichla kelberi (peacock bass) and Pygocentrus nattereri (red piranha) are within the most abundant captured species. Integrated with other actions, such as those preventing new introductions, a selective fishing schedule is proposed as an alternative approach to improve the conservation management actions and the local and regional biodiversity maintenance.

Oil platforms as introduction vector of non-native marine fish species to the Canary Islands waters (central-eastern Atlantic).

Event Abstract Back to Event Oil platforms as introduction vector of non-native marine fish species to the Canary Islands waters (central-eastern Atlantic). Raül Triay-Portella1*, José G. Pajuelo1, José A. González1, José A. Martín1, Raquel Ruiz-Díaz1, José M. Lorenzo1 and Angel Luque1 1 Instituto Universitario de Estudios Ambientales y Recursos Naturales i-UNAT, Departamento de Biología, Universidad de Las Palmas de Gran Canaria, Spain This work documents the introduction of non-native fish species to the Canary Islands (central-eastern Atlantic) through oil rigs. These structures provide artificial hard substrates in places where do not exist naturally. Methodological approaches have included surveys by underwater visual censuses around and under oil platforms and along the docking area of rigs (ground zero). Eleven tropical or subtropical non-native fish species belonging to five families were registered. Paranthias furcifer, Abudefduf hoefleri, Acanthurus bahianus, Acanthurus chirurgus, and Acanthurus coeruleus were first recorded from the Canaries. Other three species not be identified have never been observed in the Canaries. Cephalopholis taeniops, Abudefduf saxatilis, and Acanthurus monroviae had previously recorded. Native areas of these species coincide with the areas of origin and the scale of oil rigs with destination the Port of Las Palmas. The market for oil rigs operating in West Africa and South America has increasingly consolidated the Port of Las Palmas. It is very probable that this heavy overseas traffic was responsible for many of the first records that were attributed to other sources in the past ten years, and according to our data this also could be applied to southern Brazil and the Cape Verdes. For the moment, the number of individuals of the non-native species in marine ecosystems of the Canaries seems to be low, and more investigation is needed for controlling these translocations. Keywords: alien species, non indigenous species, Oil rigs, Input vector, Canary Islands Conference: XIX Iberian Symposium on Marine Biology Studies, Porto, Portugal, 5 Sep - 9 Sep, 2016. Presentation Type: Oral Presentation Topic: 2. GLOBAL CHANGES, INVASIVE SPECIES AND CONSERVATION Citation: Triay-Portella R, Pajuelo J, González J, Martín J, Ruiz-Díaz R, Lorenzo J and Luque A (2016). Oil platforms as introduction vector of non-native marine fish species to the Canary Islands waters (central-eastern Atlantic).. Front. Mar. Sci. Conference Abstract: XIX Iberian Symposium on Marine Biology Studies. doi: 10.3389/conf.FMARS.2016.05.00020 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 29 Apr 2016; Published Online: 02 Sep 2016. * Correspondence: MD. Raül Triay-Portella, Instituto Universitario de Estudios Ambientales y Recursos Naturales i-UNAT, Departamento de Biología, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain, emap.raul@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Raül Triay-Portella José G. Pajuelo José A. González José A. Martín Raquel Ruiz-Díaz José M. Lorenzo Angel Luque Google Raül Triay-Portella José G. Pajuelo José A. González José A. Martín Raquel Ruiz-Díaz José M. Lorenzo Angel Luque Google Scholar Raül Triay-Portella José G. Pajuelo José A. González José A. Martín Raquel Ruiz-Díaz José M. Lorenzo Angel Luque PubMed Raül Triay-Portella José G. Pajuelo José A. González José A. Martín Raquel Ruiz-Díaz José M. Lorenzo Angel Luque Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.

Invader Potential and Population Structure of Non-Native Fish Species, Cyprinus carpio with Respect of Climate from the Vindhya Region, India

Cyprinus carpio is a non-native fish species in the India. Studies were undertaken during January 2015 to February 2016 from the Ken river (Vindhyan region), India. 505 fish specimens (247 males and 258 females) were examined of Cyprinus carpio for determination of population structure. Age composition ranged from 0+ to 10+ years with powerfully invaded in the river. The 1+ and 2+ age group was most exploited (20.65% each) population in case of male while in case of female 2+ age group was most exploited with 21.70%. After 2+ age group exploitation was decreased with increasing of the age of fishes. Male population was dominated in 0+, 1+ and 3+ age groups compared to female fishes. In stock, female population was more exploited than male. The 9+ and 10+ age groups of fishes were shared very minute proportion.

A newly identified population of Gambusia affinis (Baird and Girard, 1853), a non-native invasive species, in Lake Kenyir, Malaysia: implications for management

Gambusia affinis (Baird and Girard, 1853), a notorious non-native invasive fish species, has negatively impacted aquatic ecosystems around the world. This species was recently identified in Lake Kenyir, one of the largest impoundments in South East Asia, using DNA barcoding. The coxI sequence of Gambusia caught in Lake Kenyir was compared with the sequences of topotypic voucher specimens of G. affinis and two other candidate Poeciliidae. The species was found to cluster with G. affinis but not with monophyletic clades of either G. holbrooki or P. reticulata thus confirming species identity. The fish is yet to be widely established in the lake with the current distribution limited to areas of anthropogenic disturbance.

Carnivory during Ontogeny of the Plagioscion squamosissimus: A Successful Non-Native Fish in a Lentic Environment of the Upper Paraná River Basin.

This study evaluated feeding patterns and ontogenetic variations in a non-native fish species (Plagioscion squamosissimus) in an isolated lake in the Upper Paraná River floodplain. Quarterly samplings were performed from April 2005 to February 2006 using plankton nets to capture larvae, seining nets for juveniles, and gill nets and trammel for adults. Stomach contents (n = 378) were examined according to the volumetric method in which the volume of each food item was estimated using graduated test tubes or a glass counting plate. During early development (larval stage), P. squamosissimus consumed mainly Cladocera and Copepoda. Juveniles showed a more diverse diet, including shrimp (Macrobrachium amazonicum), fish, aquatic insects (Trichoptera, Ephemeroptera, Chironomidae and pupae of Diptera) and plants. It was notable the high proportion of cannibalism (23.3%) in this stage. Adults consumed predominantly shrimp and fish. The use of food resources varied significantly between development stages (ANOSIM; r = 0.458; p<0.005), showing changes in food preferences during ontogeny. The Similarity Percentage Analysis (SIMPER) indicated that Cladocera and Copepoda were responsible for the differences observed between the larval stages of pre-flexion, flexion and post-flexion. M. amazonicum and Chironomidae were responsible for the differences between juvenile and larval stages, while M. amazonicum and other fishes caused the differences between adults and other ontogenetic stages. These results are confirmed by the relationship between standard length and developmental periods (ANCOVA; r2 = 0.94; p<0.0001). In general, there were low values of trophic niche breadth. The essentially carnivorous habit from the early stages of P. squamosissimus and the predominant use of M. amazonicum by adults have important roles in feeding patterns of the species, suggesting a major contribution to its success and establishment, especially in lentic environments.

Fishes from Lake Yaxhá, Mayan Biosphere Reserve, Petén, Guatemala

The Mayan Biosphere Reserve is the largest protected area in Guatemala. Lake Yaxhá is located inside the core zone. Using electrofishing, seines and gillnets we assessed the fish richness and community in 2011. We collected 18 species distributed in seven families, with Cichlidae (seven species) and Poecilidae (five species) the most specious. We evaluated the effectiveness of electrofishing to sample the most important fish in the artisanal fishery in Petén, Petenia splendida, with September being the month with the highest capture per unit of effort. Lake Yaxhá assemblage was similar to the Usumacinta through a hierarchical cluster analysis, despite being located in the Mopan-Hondo basin. Lake Yaxhá is the only system in the area that does not have non-native fish species, emphasizing the importance of conservation of this lentic system in the Mayan Biosphere Reserve.

Non-native freshwater fish species in China

Non-native fishes are regarded as a serious threat to freshwater biodiversity. However, little information exists about non-native freshwater fish in China. This study compiled an inventory of non-native freshwater fish species in China based on various sources. The inventory includes a total of 439 freshwater fish species belonging to 22 orders, 67 families, and 256 genera. The four most dominant orders were Perciformes, Characiformes, Siluriformes, and Cypriniformes, accounting for 38.50 14.81 13.90, and 11.16 % of the non-native freshwater fish in China, respectively. Over one-third of non-native freshwater fish species were of South American origin (35.54 %), followed by Asian (23.01 %), and African (21.41 %) origins. The aquarium and aquaculture industries are the two main vectors responsible for the introduction of non-native fish species into China. The status and potential impacts of most non-native fishes are uncertain. This study summarizes the known ecological and economic effects of non-native freshwater fishes in China. The results demonstrate that there are enormous positive and negative impacts of non-native fishes on the economy, and that some non-native species are potential threats to humans and biodiversity in China. Therefore, more attention should be focused on non-native fishes in China in the future.

Use of seasonally flooded rice fields by fish and crayfish in a Mediterranean wetland

Rice fields constitute a significant proportion of the existing wetlands in the Mediterranean basin and are important areas for the conservation of different vertebrate species, especially birds. However, little is known on how fish and crayfish use rice fields in Mediterranean areas. In this work we analyze fish communities and crayfish populations occupying rice fields and their associated irrigation network (inflow and outflow channels) in the Ebro Delta (NE Spain). We set fyke nets in 104 sites and captured almost 23,000 fish belonging to 19 species, 9 of which were found to occupy rice fields, as well as over 3000 red swamp crayfish (Procambarus clarkii). Stone moroko (Pseudorasbora parva), common carp (Cyprinus carpio), dojo loach (Misgurnus anguillicaudatus) and Eastern mosquitofish (Gambusia holbrooki) were the most common fish found in rice fields. More than 95% of the fish individuals captured belonged to non-native species. Dojo loach, a recently introduced species well adapted to rice cultivation cycles in its native range, used rice fields as reproduction ground. Outflow channels seemed to be a more important source of fish colonizing rice fields than inflow channels. Colonization was the main limitation for the establishment of fish populations in rice fields and fish tended to be more abundant in rice fields than in channels for any given frequency of occurrence. The importance of fish as trophic resource for natural predators and the possible interactions between fish occupying rice fields and rice yield, largely unexplored in the Mediterranean areas, could be managed by modulating connectivity between rice fields and irrigation channels. Rice fields, however, are not important areas for the conservation of native fish biodiversity, being largely occupied by non-native fishes. Moreover, the influence of low-conductivity water diverted for rice cultivation on natural wetlands favors the establishment and expansion of different non-native fish species.

Non-native fish species in heated lakes: Origins and present status

Abstract This paper discusses the problem of the occurrence of non-native fish species in a strongly transformed aquatic ecosystem. The changes in this ecosystem are caused by warm water discharges from two electric power plants. Twelve non-native fish species are confirmed to occur in the system of five heated lakes located in central Poland. In total, 30% of the total number of non-native species confirmed in Polish inland waters were noted. Aquaculture and fisheries are the primary sources of non-native species in these lakes. Among the species identified, most reached the lakes or canals by escaping from farming facilities or through commercial stocking. Four species have established stable populations. Pseudorasbora parva (Temminck &amp; Schlegel), Carassius gibelio (Bloch), and Carassius auratus (L.) are invasive species that occur abundantly in all the lakes, while Cyprinus carpio L. reproduces irregularly and only in the most heated lakes. The remaining species do not reproduce in the heated lakes system, or anywhere else in Poland; still, the threat these species pose must not be underestimated.

Management Elements Proposal for Sutla Natura 2000 Site

Abstract Following the accession of Croatia to the EU, a study was carried out on a Croatian Natura 2000 site which includes habitats used by the following fish species of conservation interest: Eudontomyzon vladykovi, Rhodeus sericeus amarus, Gobio uranoscopus, Romanogobio kesslerii, Barbus meridionalis, Zingel streber and Cottus gobio. Harmful effects on fish fauna were found due to: poorly-integrated water management, over-extraction of water for irrigation, fragmentation of riparian vegetation, low cooperation between environment institutions in Croatia and Slovenia, abuse of pesticides, uncontrolled waste water, sources of chemicals and heavy metals, leakage of nitrogen, habitats fragmentation due to dams and canals, non-native fish species, invasive species and gravel extraction. Specific management actions are proposed that take account of the different fish species of conservation interest and their specific biological and ecological requirements.

Integrating Nonnative Species in Niche Models to Prioritize Native Fish Restoration Activity Locations along a Desert River Corridor

AbstractThe efficient allocation of restoration resources is critical for the effective conservation of species. Here, we developed an ecological niche model to predict the response of three imperiled desert fishes to potential restoration actions along the longitudinal gradient of a desert river. The San Rafael River, Utah, is home to a complex of three endemic fishes (Flannelmouth Sucker Catostomus latipinnis, Bluehead Sucker C. discobolus, and Roundtail Chub Gila robusta; referred to as the “three species”). Like many Colorado River basin tributaries, the river is overallocated for human use, has experienced extensive physical degradation, and is now home to several nonnative fish species. To determine the factors most limiting to the three species, we first fit random forest models to fish CPUE and habitat data. We next combined these models with a longitudinal habitat survey and modeled nonnative species abundance to predict the continuous distribution of the three species in the lower San Rafael River, under current conditions and following simulated restoration. Nonnative fishes were important negative predictors of Flannelmouth Sucker and Bluehead Sucker relative abundance, and broadscale habitat variables were important positive predictors for all of the three species. Each of the three species was predicted to experience a significant increase in abundance following simulated eradication of nonnative fishes. Responses to simulated reach‐specific habitat restoration were dependent on the reach restored, demonstrating that the choice of restoration location is critical. Nonnative species removal and restoring degraded reaches near already suitable habitat were predicted to be the most beneficial to the three species. Ecological niche models developed at the river scale, and incorporating both physical and biotic predictor variables, can provide spatially explicit information that appropriately parallels the spatial distribution of the needs of endemic fishes and can facilitate effective management and conservation decisions.

Food habits of harbor seals (Phoca vitulina richardii) as an indicator of invasive species in San Francisco Bay, California

AbstractThe diet of harbor seals (Phoca vitulina richardii) in San Francisco Bay (SFB), California, was determined from July 2007 to July 2008 using prey hard parts recovered from 442 scats collected at five haul‐out sites. Twenty‐two species of fish and one species of crustacean were identified, but harbor seals primarily ate a nonnative invasive species, yellowfin goby (Acanthogobius flavimanus), which increased in dietary importance since the diet was last studied in 1991/1992. Additionally, another nonnative invasive fish species, chameleon goby (Tridentiger trigonocephalus), was found for the first time in the diet of harbor seals in SFB. Harbor seal diet was statistically different between years (1991/1992 and 2007/2008), between the pupping and nonpupping seasons, and between North SFB and South SFB haul‐out locations. The diet of harbor seals was significantly correlated with fish species caught in trawl surveys conducted by the California Department of Fish and Wildlife (CDFW) during the same time periods as this study (2007/2008). Harbor seals currently are influencing the health of the SFB ecosystem in a positive manner by consuming large quantities of nonnative invasive fish species.

An ecosystem-service approach to evaluate the role of non-native species in urbanized wetlands.

Natural wetlands have been increasingly transformed into urbanized ecosystems commonly colonized by stress-tolerant non-native species. Although non-native species present numerous threats to natural ecosystems, some could provide important benefits to urbanized ecosystems. This study investigated the extent of colonization by non-native fish and bird species of three urbanized wetlands in subtropical Taiwan. Using literature data the role of each non-native species in the urbanized wetland was evaluated by their effect (benefits/damages) on ecosystem services (ES) based on their ecological traits. Our sites were seriously colonized by non-native fishes (39%–100%), but <3% by non-native birds. Although most non-native species could damage ES regulation (disease control and wastewater purification), some could be beneficial to the urbanized wetland ES. Our results indicated the importance of non-native fishes in supporting ES by serving as food source to fish-eating waterbirds (native, and migratory species) due to their high abundance, particularly for Oreochromis spp. However, all non-native birds are regarded as “harmful” species causing important ecosystem disservices, and thus eradication of these bird-invaders from urban wetlands would be needed. This simple framework for role evaluation of non-native species represents a holistic and transferable approach to facilitate decision making on management priority of non-native species in urbanized wetlands.

Presence and absence of non-native fish species in the Wet Tropics region, Australia.

Distributional records of non-native fish species were identified in the Wet Tropics region, Far North Queensland, Australia, through a compilation of published records and expert knowledge. A total of 1106 records were identified comprising 346 presence and four uncertain records for at least 13 species, and 756 absence records. All current presence records consist of six species from the families Cichlidae and Poeciliidae with established self-sustaining populations in the region, probably affecting the highly diverse native fish fauna.

VIS - A database on the distribution of fishes in inland and estuarine waters in Flanders, Belgium.

The Research Institute for Nature and Forest (INBO) has been performing standardized fish stock assessments in Flanders, Belgium. This Flemish Fish Monitoring Network aims to assess fish populations in public waters at regular time intervals in both inland waters and estuaries. This monitoring was set up in support of the Water Framework Directive, the Habitat Directive, the Eel Regulation, the Red List of fishes, fish stock management, biodiversity research, and to assess the colonization and spreading of non-native fish species. The collected data are consolidated in the Fish Information System or VIS. From VIS, the occurrence data are now published at the INBO IPT as two datasets: ‘VIS - Fishes in inland waters in Flanders, Belgium’ and ‘VIS - Fishes in estuarine waters in Flanders, Belgium’. Together these datasets represent a complete overview of the distribution and abundance of fish species pertaining in Flanders from late 1992 to the end of 2012. This data paper discusses both datasets together, as both have a similar methodology and structure. The inland waters dataset contains over 350,000 fish observations, sampled between 1992 and 2012 from over 2,000 locations in inland rivers, streams, canals, and enclosed waters in Flanders. The dataset includes 64 fish species, as well as a number of non-target species (mainly crustaceans). The estuarine waters dataset contains over 44,000 fish observations, sampled between 1995 and 2012 from almost 50 locations in the estuaries of the rivers Yser and Scheldt (“Zeeschelde”), including two sampling sites in the Netherlands. The dataset includes 69 fish species and a number of non-target crustacean species. To foster broad and collaborative use, the data are dedicated to the public domain under a Creative Commons Zero waiver and reference the INBO norms for data use.

Growth and reproduction of a non-native fish species Carassius gibelio (Bloch, 1782) from Büyükçekmece Lake (İstanbul, Turkey)

Buyukcekmece Lake is a lagoon lake located at the mouth of Karasu Stream, which drains into the Sea of Marmara. The sea connection of the lagoon was blocked by the Buyukcekmece Dam in 1985 so the lagoon became a freshwater lake over time. Non–native Carassius gibelio (Bloch 1782) was introduced to the lake by a fisherman in early 1990s. By the time, it has become one of the most dominant fish species in the lake despite predators like Esox lucius , Linneaeus 1758, Silurus glanis Linnaeus, 1758 and also other cyprinids such as Cyprinus carpio , Linneaeus 1758, Scardinius erythrophthalmus (Linneaeus 1758) which have similar feeding regime. The aim of the current study was to study the growth and reproduction characteristics of gibel carp living in the lake. Field surveys were carried out monthly between March 2009 and April 2010. Fork length and body weight were determined between 4.4–31.4 cm and 1.44–774.4 g, respectively. The female:male ratio of total 487 gibel carp specimens was estimated as 20.1:1.0. The age composition of the population ranged from age class I to XI. The length–weight relationships, condition factor and von Bertalanffy growth parameters were estimated for all individuals as W =0.0154 FL 3.134 , K=2.26 (SE=0.02) and L t =33.97[1–e -0.198(t+0.162) ], respectively. Length at first maturity was calculated as 13.23 cm FL for females. Mean absolute fecundity in a mature female was 46,628 eggs (SE = 3,880), ranging from 5,266 eggs (16.7 cm FL) to 78,416 eggs (25.3 cm FL). The relationships between fecundity and fish size (fork length and weight) were calculated by regression analysis and the fecundity increased exponentially with the fish length and weight.

Population size structure of non-native fishes along longitudinal gradients in a highly regulated Mediterranean basin.

Event Abstract Back to Event Population size structure of non-native fishes along longitudinal gradients in a highly regulated Mediterranean basin. Fátima Amat-Trigo1*, Mar Torralva-Forero1*, David Verdiell-Cubedo1*, Ana Ruiz-Navarro2* and Francisco José Oliva-Paterna1* 1 Universidad de Murcia, Departamento de Zoología y Antropología Física, Spain 2 Centre for Ecology, Environment and Sustainability, Department of Life and Enviromental Sciences, United Kingdom Population size structure can provide insights in species-specific knowledge and fish management. The purpose of the present study is to assess the influence of hydrological flow variability along the longitudinal gradient in the population size structure metrics of three non-native fish species widely distributed in the Iberian Peninsula, Alburnus alburnus L., Lepomis gibbosus L. and Gobio lozanoi Doadrio & Madeira, 2004. We analysed populations at site level (29 sampling localities in fluvial sectors) along the longitudinal gradient in the main rivers of the Segura River basin, which is one of the most regulated basins in the Iberian Peninsula. The total of 3265 specimens (1636 A. alburnus, 349 L. gibbosus and 1280 G. lozanoi) caught during autumns was measured in situ for length. We explored nine population size metrics (average, median, maximum, minimum, size range, variance, coefficient of variation, skewness and kurtosis of Fork Length). Population size metrics significantly differed at site level and at sector level. Sampling sites directly influenced by a potential refuge of the large reservoirs showed a higher variance in the population size structure of A. alburnus and L. gibbosus, but less variance in the G. lozanoi populations. In fact, flow regulation and the presence of fish refuges to higher discharges have been shown as significant factors to explain the variability in several population size metrics. Documented changes in fish size metrics at population levels can demonstrate trends in non-native fishes at basin scale, however, the collinearity with spatial gradients and the species-specific response could make it a difficult undertaking. Keywords: freshwater fishes, invasive species, population structure, Regulated basin, Longitudinal gradients Conference: XV European Congress of Ichthyology, Porto, Portugal, 7 Sep - 11 Sep, 2015. Presentation Type: Poster Presentation Topic: Ecology, Conservation and Invasive Species Citation: Amat-Trigo F, Torralva-Forero M, Verdiell-Cubedo D, Ruiz-Navarro A and Oliva-Paterna F (2015). Population size structure of non-native fishes along longitudinal gradients in a highly regulated Mediterranean basin.. Front. Mar. Sci. Conference Abstract: XV European Congress of Ichthyology. doi: 10.3389/conf.FMARS.2015.03.00173 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 23 Oct 2015; Published Online: 28 Nov 2015. * Correspondence: PhD. Fátima Amat-Trigo, Universidad de Murcia, Departamento de Zoología y Antropología Física, Murcia, Murcia, 30100, Spain, fatima.amat@um.es Dr. Mar Torralva-Forero, Universidad de Murcia, Departamento de Zoología y Antropología Física, Murcia, Murcia, 30100, Spain, torralva@um.es Dr. David Verdiell-Cubedo, Universidad de Murcia, Departamento de Zoología y Antropología Física, Murcia, Murcia, 30100, Spain, verdiell@um.es Dr. Ana Ruiz-Navarro, Centre for Ecology, Environment and Sustainability, Department of Life and Enviromental Sciences, Poole, Dorset, BH12 5BB, United Kingdom, anaruiz@um.es Dr. Francisco José Oliva-Paterna, Universidad de Murcia, Departamento de Zoología y Antropología Física, Murcia, Murcia, 30100, Spain, fjoliva@um.es Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Fátima Amat-Trigo Mar Torralva-Forero David Verdiell-Cubedo Ana Ruiz-Navarro Francisco José Oliva-Paterna Google Fátima Amat-Trigo Mar Torralva-Forero David Verdiell-Cubedo Ana Ruiz-Navarro Francisco José Oliva-Paterna Google Scholar Fátima Amat-Trigo Mar Torralva-Forero David Verdiell-Cubedo Ana Ruiz-Navarro Francisco José Oliva-Paterna PubMed Fátima Amat-Trigo Mar Torralva-Forero David Verdiell-Cubedo Ana Ruiz-Navarro Francisco José Oliva-Paterna Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.

Angling web forums as an additional tool for detection of new fish introductions: the first record ofPerca fluviatilisin continental Portugal

Key-words: Biological invasions, angling, freshwater introductions, invasive fish This work reports for the first time the presence of a non-native fish, the European Perch (Perca fluviatilis), in continental Portugal. The presence of this species was first reported on an angling web forum and its occur- rence was scientifically confirmed later in a small reservoir of the Tagus river basin, located in the central region of Portugal. The importance of the angling web forums as a useful tool to help detection of non-native fish species introductions and their potential for education on biological invasions is discussed.

Fremde Fische in Flüssen und Seen

AbstractMit der Globalisierung steigt auch die Zahl nicht‐heimischer Fischarten in unseren Gewässern. Sie kommen über künstliche Kanäle, werden mit Ballastwasser verschleppt oder heften ihre Eier an Schiffe und andere Gegenstände. Viele dieser Arten bleiben unbemerkt, einige können sich jedoch etablieren und sogar Schaden anrichten. Wir zeigen am Beispiel der bei uns eingewanderten Grundeln aus dem Schwarzen Meer, insbesondere der Kesslergrundel und der Schwarzmundgrundel, wie vorgegangen werden kann, um die Biologie und Ökologie dieser Arten zu charakterisieren, und den Schaden abzuschätzen. Mit dem Einsatz einfacher Laichfallen zeigen wir eine Möglichkeit, wie die Ausbreitung dieser Fische vielleicht eingeschränkt werden kann. Grundsätzlich vielversprechend sind solche Maßnahmen dort, wo wie am Hochrhein durch Kraftwerke künstliche Barrieren und damit möglicherweise kontrollierbare Nadelöhre bestehen.