Economic Viability of the Production of Peruvian Grunt () in RAS on the Peruvian-Chilean Desert Coast.

The Peruvian grunt is one of the most appreciated fish in Peruvian national markets. However, its reduced and irregular fishery is a paradigm of illegal, unreported, and unregulated fishing (IUU) in the Peruvian-Chilean coastal region. An important technological advancement has been achieved in the last decade in capture, management, nutrition, and broodstock maintenance to boost pilot experiences on the aquaculture of this species.

Reproductive management: conditioning, spawning and development of Peruvian grunt in southern Peru.

The Peruvian grunt, , is beginning its domestication as a candidate species for marine aquaculture. The optimal management of fingerling production requires precise knowledge on early development. Herein, we report the methodology for capturing and conditioning wild specimens to find a viable broodstock.

Gene Expression and Phenotypic Assessment of Egg Quality across Developmental Stages of Atlantic Cod throughout the Spawning Season.

Egg quality in fishes is commonly determined by fertilisation success and cleavage patterns as a phenotypic outcome of underlying regulatory mechanisms. Although these phenotypic estimators of egg quality are useful in farming conditions, these "good quality" egg batches do not always translate to good larval growth and survival. The identification of genes involved in embryonic development may help find links between genetic factors of maternal origin and egg quality.

The embryo-oil drop assembly: the timing and morphology of a critical event for fish early-life history survival.

Egg specific gravity is of relevance for fish recruitment since the ability to float influences egg and larvae development, dispersal and connectivity between fishing grounds. Using zootechnics, histological approaches, optical and electronic transmission microscopy, this study describes the morphogenetic mechanism of adhesion of the oil-drop covering layer (OCL) to the oil droplet (OD) in embryos of Merluccius merluccius under physical conditions reflecting the marine environment. The herein described primordial (p)OCL is a substructure of the inner yolk syncytial layer which contains egg organella aimed to mobilize lipidic reserves from the oil drop (OD) towards the embryo blood.

Influence of Pediveliger Larvae Stocking Density on Settlement Efficiency and Seed Production in Captivity of in Amsa Bay, Tetouan.

In mussel hatchery systems, the settlement process is a crucial element influencing seed yield. The current study assayed the influence of five densities of competent pediveliger larvae on settlement success and post-larvae production. We showed an inverse relationship between density and settlement efficiency, e.

Population Genetic Divergence among Worldwide Gene Pools of the Mediterranean Mussel .

The Mediterranean mussel is distributed in both hemispheres either natively or introduced. The updated population genetic distribution of this species provides a useful knowledge against which future distribution shifts could be assessed. This study, performed with seven microsatellite markers and three reference species (, and ), aimed to determine the scenario of genetic divergence between 15 samples of from 10 localities in Europe, Africa, Asia, Australia, North America and South America.

Genetic Divergence and Connectivity among Gene Pools of .

Three regional gene pools of have been described so far, i.e., the North Atlantic, the Southwest Atlantic, and the Indo-Pacific Ocean.

EST-Microsatellite Types and Structural Scenarios in European Hake Fisheries.

A fishery's structure and connectivity are priors to its effective management. A successful description of such processes depends on both the sampling design and the choice of adequate genetic markers. EST markers are perfusing the studies of marine metapopulations and are believed to provide access to functional polymorphisms.

Phylogenetic prospecting for cryptic species of the genus Merluccius (Actinopterygii: Merlucciidae).

Hakes of the genus Merluccius include 11 valid species as well a number of rare morphotypes suspected to be "cryptic species". Concatenated nucDNA ITS1-rDNA and mtDNA cyt b sequences plus nested ITS1Nes sequences allowed to ascribe 14 specimens of nine rare morphotypes from the South Pacific and the South Atlantic to the phylogenetic backbone of this genus. Bayesian analyses pointed to M.

Reconciling differences in natural tags to infer demographic and genetic connectivity in marine fish populations.

Processes regulating population connectivity are complex, ranging from extrinsic environmental factors to intrinsic individual based features, and are a major force shaping the persistence of fish species and population responses to harvesting and environmental change. Here we developed an integrated assessment of demographic and genetic connectivity of European flounder Platichthys flesus in the northeast Atlantic (from the Norwegian to the Portuguese coast) and Baltic Sea. Specifically, we used a Bayesian infinite mixture model to infer the most likely number of natal sources of individuals based on otolith near core chemical composition.

Methodological evaluation of DNA-based molecular keys to identify categories of mislabelling in commercial products from genus Merluccius spp.

The large variety of fish formats which are globally commercialized supports use of meta-evaluation studies to test discrimination power among molecular keys available for traceability of highly-degraded and/or chemically-modified DNA material. This paper shows that a combination of DNA identification methods validated for genus Merluccius allows 100% species assignment in hake products and offers higher diagnostic power (97% on products) than individual methods, i.e.

Disentangling the genetic and morphological structure of complex in Macaronesia (NE Atlantic).

The uptake of natural living resources for human consumption has triggered serious changes in the balance of ecosystems. In the archipelagos of Macaronesia (NE Atlantic), limpets have been extensively exploited probably since islands were first colonized. This has led to profound consequences in the dynamics of rocky shore communities.

Prey Capture, Ingestion, and Digestion Dynamics of Paralarvae Fed Live Zooplankton.

is a species of great interest in research areas such as neurobiology, ethology, and ecology but also a candidate species for aquaculture as a food resource and for alleviating the fishing pressure on its wild populations. This study aimed to characterize the predatory behavior of paralarvae and to quantify their digestive activity. Those processes were affordable using the video-recording analysis of 3 days post-hatching (dph), mantle-transparent paralarvae feeding on 18 types of live zooplanktonic prey.

Validation of a tRNA-Glu-cytochrome b key for the molecular identification of 12 hake species (Merluccius spp.) and Atlantic Cod (Gadus morhua) using PCR-RFLPs, FINS, and BLAST.

The goal of this study was to develop a diagnostic key for hake meat to solve the limitations of previous identification methodologies, mainly related to the high degradation of the DNA recovered from processed foods. We describe the development of two molecular tools based on polymerase chain reaction (PCR) and PCR-restriction fragment length polymorphisms of the cytochrome b gene, respectively, to identify DNA from 12 hake species in commercial products. The first assay is an exclusion test consisting of the PCR amplification of a 122 bp fragment using nested primers interspecifically conserved in Merluccius spp.

A microsatellite genetic map of the turbot (Scophthalmus maximus).

A consensus microsatellite-based linkage map of the turbot (Scophthalmus maximus) was constructed from two unrelated families. The mapping panel was derived from a gynogenetic family of 96 haploid embryos and a biparental diploid family of 85 full-sib progeny with known linkage phase. A total of 242 microsatellites were mapped in 26 linkage groups, six markers remaining unlinked.

ITS1-rDNA-based methodology to identify world-wide hake species of the Genus Merluccius.

Species-specific DNA-based tags are valuable tools for the management of both fisheries and commercial fish products. In this study, we have developed a two-step molecular tool to detect the presence of hake DNA (Merluccius spp.) and to identify the exact hake species present in an blind sample.

Distribution and abundance of microsatellites in the genome of bivalves.

Understanding how microsatellites are distributed in eukaryotic genomes is important to clarify the differential abundance of these repeats under an evolutionary scenario. We have concatenated data from 3165 DNA sequences of 326 Bivalvia species to search for taxonomic patterns of microsatellite distribution in genomic regions of markedly different functionality. Some microsatellite motifs in bivalves showed one of the lowest genomic densities observed among eukaryotes.