Enrique Blanco Gonzalez

Universitetet i Agder | UIA · Department of Natural Sciences

A correction to this paper has been published: https://doi.org/10.1007/s12562-021-01502-z

Understanding the biological processes involved in genetic differentiation and divergence between populations within species is a pivotal aim in evolutionary biology. One particular phenomenon that requires clarification is the maintenance of genetic barriers despite the high potential for gene flow in the marine environment. Such patterns have bee...

Translocation of organisms within or outside its native range carries the risk of modifying the community of the recipient ecosystems and induces gene flow between locally adapted populations or closely related species. In this study, we evaluated the genetic consequences of large‐scale translocation of cleaner wrasses that has become a common prac...

Corkwing wrasse, Symphodus melops, is one of the main species used as cleaner fish to combat sea lice infestation in salmon aquaculture; however, there is little knowledge about its biology. Here, we describe the embryonic development of this species and examine the viability of the eggs under three temperature regimes. The experiments were conduct...

Norway leads the world aquaculture Atlantic salmon (Salmo salar) production with 1.2 million tons a year and a value of approximately 800 billion JPY. However, salmon lice infestation remains a major challenge for the industry which is continuously evolving towards mitigating the sea lice problem. A broad range of approaches have been tested, and n...

Norway leads the world aquaculture production of Atlantic salmon (Salmo salar). However, salmon lice infestation remains a major challenge for the industry which is continuously evolving towards mitigating the sea lice problem. Among the different prevention and treatment measures available, the biological control of sea lice infestation by cleaner...

The wrasses (Labridae) are one of the most successful and species-rich families of the Perciformes order of teleost fish. Its members display great morphological diversity, and occupy distinct trophic levels in coastal waters and coral reefs. The cleaning behaviour displayed by some wrasses, such as corkwing wrasse (Symphodus melops), is of particu...

Norway leads the world aquaculture production of Atlantic salmon Salmo salar and farmed Norwegian Atlantic salmon is currently consumed around the globe. However, sea lice infestation is a major problem faced by the salmon aquaculture industry in Norway and elsewhere. The use of wild-caught cleaner fish, mainly wrasses, has been recommended over th...

Habitat fragmentation has been suggested to be responsible for major genetic differentiations in a range of marine organisms. In this study, we combined genetic data and environmental information to unravel the relative role of geography and habitat heterogeneity on patterns of genetic population structure of corkwing wrasse (Symphodus melops), a r...

Allele frequencies and size distributions among corkwing wrasse sampling localities at nine microsatellite markers. The size of the bubble corresponds to the frequency of the respective allele in the sample. (PDF)

Results of the Bayesian clustering of corkwing wrasse from sixteen sample localities based on STRUCTURE. Each vertical bar in the left graph denotes an individual fish, whilst colours denote inferred clusters (K = 2 to 5). The right graph shows ΔK for different numbers of genetic clusters, suggesting K = 2 as the most likely outcome. (PDF)

Genetic variability at nine microsatellite loci. A = number of alleles, HT = gene diversity in the total material; FST = estimate of θ (Weir & Cockerham 1984). Numbers in bold indicate statistical significant tests at 1% level after the False Discovery Rate approach (Benjamini & Hochberg 1995). (PDF)

Large-scale hatchery releases are carried out for many marine fish species worldwide; nevertheless, the long-term effects of this practice on the genetic structure of natural populations remains unclear. The lack of knowledge is especially evident when independent stock enhancement programs are conducted simultaneously on the same species at differ...

The ling, Molva molva, is a commercially exploited demersal gadid fish distributed throughout the Northeast Atlantic. Here, we provide the first study of population genetic structure by genotyping 6 geographically distinct samples with 11 microsatellite DNA markers. The results rejected the hypothesis of a single ling stock in the Northeast Atlanti...

Population structuring in the northern shrimp (Pandalus borealis) in the North Sea area (including Fladen and Skagerrak) was studied by microsatellite DNA analyses. Screening 20 sample locations in the open ocean and Skagerrak fjords for nine loci revealed low, but significant genetic heterogeneity. The spatial genetic structure among oceanic sampl...

One mechanism by which marine organisms may respond to climate shifts is range shifts. The corkwing wrasse (Symphodus melops) is a temperate fish species, inhabiting the coasts of Europe, that show strong indications of current as well as historical (ice-age) range shifts towards the north. Nine neutral microsatellite DNA markers were screened to s...

Since 1978, millions of hatchery-reared red sea bream (Pagrus major) juveniles have been released in Sagami Bay and Tokyo Bay in Kanagawa Prefecture, Japan. The stock enhancement program has contributed to total catch; however, no information regarding the genetic interactions with wild counterparts is available. Here, we combined 15 microsatellite...

In this study, multiplex PCR panels were developed to amplify 20 microsatellite markers for red sea bream, Pagrus major, with the aim of reducing labor and material costs associated with genetic analysis of this species. The usefulness of these panels was validated in 200 fish collected at five sampling locations. The occurrence of null alleles was...

Stock enhancement programs are conducted worldwide, with Japan leading in marine species. One of the target species for release in the country is black sea bream (Acanthopagrus schlegelii). A stock enhancement program for this fish in Hiroshima Bay has been conducted over the last 3 decades. The large number of juveniles released has contributed to...

The management of the broodstock used for stock enhancement purposes is essential to preserve the genetic resources of the natural populations. Black sea bream (Acanthopagrus schlegelii) has been extensively released in Japan; nevertheless, the little emphasis paid on the genetic conservation, resulted in important drifts due to the small number of...

More than 20 million black sea bream (Acanthopagrus schlegelii) juveniles have been released in Hiroshima Bay since stock enhancement of the fishery began in the early 1980s. The majority (90%) of the black sea bream harvest occurs between April and June. Catch per unit effort (CPUE) increased substantially following the most intensive releases (19...

Black sea bream (Acanthopagrus schlegelii) is an important commercial and sport fishing species inhabiting Hiroshima Bay, where an intensive stock enhancement program is carried out for this species. In order to clarify the fine-scale genetic effects of the releases, black sea bream specimens were collected at five locations (Ninoshima, Atatajima,...

We developed four microsatellite DNA loci to test for multiple paternity of black rockfish, Sebastes inermis, from the Seto Inland Sea of Japan. All loci showed a high degree of polymorphism (number of alleles per locus=10–14, expected heterozygosity=0.80) and discriminating power (probability of identity index=3.71×10−6, exclusion probability=0.99...

This paper reviews the stock enhancement programme for black sea bream (Acanthopagrus schlegelii) in Hiroshima Bay. This bay is one of the biggest production areas for black sea bream in Japan, accounting for about 10% of the total catch of the species in this country in 2004. After intensive fishing pressure caused a drastic decline in the catch o...

Black sea bream have been intensively stocked in Hiroshima Bay since 1982. However, no information regarding the long-term effects resulting from the release of large numbers of juveniles on the wild population has been reported. We investigated the fate of black sea bream juveniles released at the sampling site from 2000 to 2001 using six microsat...

The genetic contribution of 51 broodstock, comprising 29 females and 22 males, reared at Hiroshima City Marine Products Promotion Center for the production of stocked black sea bream was monitored during two consecutive years using seven microsatellite DNA loci. The high discrimination ability of these markers was reflected in the polymorphic ident...

In the classical taxonomy, three Scomber species are distinguished: S. scombrus, S. australasicus, and S. japonicus. Yet, some fish taxonomists have recently recognized Scomber colias, inhabiting the Atlantic Ocean, as a separate species from S. japonicus, distributed in the Pacific Ocean. Such proposal was based on significant mitochondrial DNA di...

Black rockfish juveniles (Sebastes inernis) obtained from five broodstock females in the hatchery were marked with alizarin complexon (ALC), and a total of 81,000 juveniles marked were released in the coastal waters of Ikuno Island, central Seto Inland Sea, western Japan. Variation of the mitochondrial DNA (mtDNA) control region sequence and a micr...