Summary 1. A comprehensive analysis was carried out on the effects of stocking genetic structure Iberian brown trout evolutionary lineages. Introgression and diversity were estimated from allozyme results 307 populations based own data (180) available literature (127). Stocking records, angling regulations environmental features related to hatchery performance also analysed determine underlying mechanisms introgression effects. 2. Fifty per cent showed by genes origin. The mean single locus...

Captive-bred animals derived from native, alien, or hybrid stocks are often released in large numbers natural settings with the intention of augmenting harvests. In brown trout (Salmo trutta), stocking hatchery-reared non-native fish has been main management strategy used to maintain improve depleted wild populations Iberian and other Mediterranean regions. This measure become a serious threat conservation native genetic diversity, mainly due introgressive hybridization. Aware this risk,...

The phylogeography of Atlantic brown trout (Salmo trutta) was analysed using mitochondrial DNA control region complete sequences 774 individuals from 57 locations. Additionally, the available haplotype information 100 published populations incorporated in analysis. Combined nested clade analysis, trees, mismatch distributions, and coalescent simulations used to characterize population groups basin. A major involved haplotypes assigned (AT) lineage, but another should be considered as a...

The Catalan chub, Squalius laietanus, was described in 2007 and has recently reached Vulnerable status on the IUCN Red List of Threatened Species. assigned range for this species includes lower course Ebro River Spain northwards to Tech, Têt, Agly, Massane Rivers Southeastern France. In study, 246 chub specimens caught at 15 sites nine main river basins Spanish were barcoded by sequencing a 624 bp fragment mitochondrial COI gene. laietanus haplotypes found 68% fish caught. tributary River,...

Biological invasions rank among the main global threats for biodiversity. The Eastern mosquitofish (Gambusia holbrooki) is considered one of 100 world worst invasive species due to its high adaptation capability new environments. Using restriction-site-associated DNA tags (RADtags), introduced European locations were compared against native US populations analyse genomic changes that occurred during process locations. After filtering, 7724 RADtags containing only SNP retained population...

Five qualitative and seven quantitative colouration spotting pattern features were measured in 23 brown trout Salmo trutta populations two hatchery stocks. Simultaneously, the LDH‐C1 *, a diagnostic locus fixed for *90 *100 alleles stocking native from southern Europe, respectively, was analysed to classify studied according their origin: native, stock hybrids. The three genotypes showed significant differences discriminant function analysis could correctly identify 79% of individuals. most...

Genetic analyses contribute to studies of biological invasions by mapping the origin and dispersal patterns invasive species occupying new territories. Using microsatellite loci, we assessed genetic diversity spatial population structure mosquitofish (Gambusia holbrooki) that had invaded Spanish watersheds, along with American locations close suspected potential source populations. Mosquitofish populations from streams were studied similar levels samples; therefore, these did not appear have...

Abstract Viñas, J., Sanz, N., Peñarrubia, L., Araguas, R-M., García-Marín, J-L., Roldán, M-I., and Pla, C. 2014. Genetic population structure of European anchovy in the Mediterranean Sea Northeast Atlantic Ocean using sequence analysis mitochondrial DNA control region. – ICES Journal Marine Science, 71: 391–397. The (Engraulis encrasicolus) exhibits a complex Ocean. To resolve genetic this species, we surveyed variability (mtDNA) region samples (n = 563) from 13 locations Atlantic, Bay...

Evidence of different degrees genetic interactions exogenous hatchery fish with native populations was electrophoretically obtained from collections brown trout four heavily fished areas and eight adjacent protected unfished in northeastern Spain. Although some degree hybridization or introgression detected each collection based on fixed differences between at the LDH‐C * locus less distinct were found three other loci (sMDH‐A2*, IDHP‐2*, IDHP‐3*), had significantly lower levels genes than...

Abstract– We analyzed the introduction of hatchery‐reared trout in Riutort Creek, a small stream eastern Spanish Pyrennees. used gene correlation matrices between individuals to analyze fish coancestry Creek samples and hatchery stock. Hatchery disturbed single ancestry native population creek, were clearly detected with principal coordinate analysis matrix. The amount introgression produced by successful introductions was estimated from projections matrix F ST values putative population,...

Genetic changes in the population structure of brown trout Salmo trutta eastern Pyrenees were monitored during 1990s. Stocking with cultivated exogenous fish has resulted introgressed populations where those higher introgression coefficients also have highest values heterozygosity. Nevertheless, this increase local diversity reflects a decrease genetic differentiation between and loss native alleles. These obscure gene pools modify evolutionary distinctions among populations.

The Iberian Peninsula contains diverse populations of freshwater fish, with major river basins comprising differentiated biogeographic units. Duero River flows through the North-Western and is one most important rivers within glacial refuge. Brown trout (Salmo trutta) populate this whole basin, studies using both allozyme microsatellite loci have detected a geographically sorted distribution genetic variation in species. In work, sequences mitochondrial control region obtained from 299 brown...

The blue and red shrimp, Aristeus antennatus , is a commercially important crustacean, in the Mediterranean Sea, which has been listed as priority species for fishery management. Hypervariable microsatellite markers could be useful tool to identify genetic stocks among geographically close fishing grounds. Potential (97) identified from next-generation sequencing of an individual shrimp using 454 GS Junior Pyrosequencer were tested on preliminary panel 15 individuals representing four...