Effrosyni Fatira
Forskning
Integrated assessment of cod under environmental stress - STRESSCOD
STRESSCOD is an interdisciplinary project exploring how climate change and human activities will shape the resilience and vulnerability of Atlantic cod during their critical early life stages in the Subarctic Northeast Atlantic.
Publikasjoner
Diel changes in plasma cortisol and effects of size and stress duration on the cortisol response in European sea bass (Dicentrarchus labrax)
D. labrax show high basal cortisol. Under a 12L:12D cycle, cortisol varied daily and peaked at dusk (18h), with high individual variability. Stress responses depended on fish size and stress duration, peaking at 1–2h in small fish and 0.5h in large fish.
Reproduction of hatchery-produced meagre Argyrosomus regius in captivity III. Comparison between GnRHa implants and injections on spawning kinetics and egg/larval performance parameters
In meagre, GnRHa implants and injections produced similar ovulation, fecundity, and egg quality. However, injections offered better control, more consistent batch fecundity, and could achieve higher annual fecundity.
Application of interspecific Somatic Cell Nuclear Transfer (iSCNT) in sturgeons and an unexpectedly produced gynogenetic sterlet with homozygous quadruple haploid
iSCNT in sturgeons produced one feeding larva (0.5%) from Russian sturgeon cells transferred into sterlet eggs. The tetraploid larva carried only recipient DNA, providing an important first step toward sturgeon cloning.
A newly developed cloning technique in sturgeons; an important step towards recovering endangered species
Using multiple donor cells in sturgeon SCNT improved embryo development and enabled donor DNA integration, supporting cloning as a promising tool for sturgeon conservation.
Energetic Implications of Morphological Changes between Fish Larval and Juvenile Stages Using Geometric Morphometrics of Body Shape
In Chelon auratus, morphology–metabolism links were assessed during development. Shape changes from larvae to juveniles were identified, and ETS activity correlated with body size and posterior morphology.
Development of cryopreservation media for the slow-freezing of cultured primordial germ cells in chicken
Chicken germplasm is preserved by PGC cryopreservation. New DMSO/PG media with trehalose and serum achieved >50% recovery and retained germline function, enabling offspring production.
Short-term handling stress affects the humoral immune responses of juvenile Atlantic cod, Gadus morhua
Atlantic cod juveniles exposed to short air stress showed a brief cortisol peak at 1 h and altered metabolism, while immune defenses were temporarily reduced, indicating stress affects physiology and immunity.
Cortisol levels and expression of selected stress- and apoptosis-related genes in the embryos of Atlantic cod, Gadus morhua following short-term exposure to air
Cod embryos exposed to brief air stress showed no cortisol change but increased stress- and apoptosis-related gene expression, revealing molecular stress responses independent of cortisol activity.
Blastomeres derived from the vegetal pole provide extra-embryonic nutrition to sturgeon (Acipenser) embryos: Transition from holoblastic to meroblastic cleavage
In sturgeon embryos, vegetal blastomeres form germ cells and yolk cells that become inactive after the mid-blastula transition. Yolk can be used acellularly, indicating a shift toward meroblastic cleavage in ray-finned fishes.
Seasonality of zooplankton active flux in subtropical waters
The biological carbon pump exports carbon to depth via sinking particles and zooplankton. In the Canary Current System, spring showed higher zooplankton respiration and a fourfold increase in active flux driven by biomass and body size.
The multifaceted diversification of the sagitta otolith across the fish tree of life
Otolith shape in actinopterygians varies mainly in sulcus, elongation, and curvature, is strongly integrated with function, shows low phylogenetic signal, and reflects complex, multifactorial evolution across fishes.
Diversification of cephalic shield shape and antenna in phyllosoma I of slipper and spiny lobsters (Decapoda: Achelata)
Phyllosoma larvae in Achelata show conserved early forms and more specialized later shapes. Their evolution includes two diversification bursts, mainly reflecting nonadaptive radiation with some adaptive components.
Applying geometric morphometrics in megalopa larval stages: relevance for species distribution and biological invasion studies
Megalopa morphology differed among three brachyuran crabs, with strong species-level variation in Cronius ruber and high population similarity in Percnon gibbesi, suggesting roles in invasiveness and connectivity.
Larval dynamics suggest phenological strategies and positive effect of marine protected areas controlling indigenous and non-indigenous crab populations
Megalopa abundance varied across Canary Islands and seasons, higher in warmer El Hierro. MPAs increased native crabs but reduced Cronius ruber, indicating effects on crab distribution and usefulness for monitoring.
Intracytoplasmic sperm injection in sturgeon species: A promising reproductive technology of selected genitors
ICSI in endangered sturgeons produced embryos and feeding larvae across sperm types and species combinations, with mixed parental genomes, showing potential for conservation of valuable genetic diversity.
Feasibility of intracytoplasmic sperm injection (ICSI) in activated sturgeon eggs
A 5–15 min activation window improved sturgeon ICSI, with non-activated eggs performing best. Fresh and cryopreserved sperm both produced normal embryos and hatchlings.
Modelling the alpha and beta diversity of copepods across tropical and subtropical Atlantic ecoregions
Copepod diversity in the Atlantic varied with space and depth, with taxonomic patterns mainly spatial and functional patterns depth-driven, showing contrasting turnover and nestedness dynamics.
Linking fish ecology to otolith diversity at a broad phylogenetic scale
Otolith shape in teleosts varies mainly with elongation, sulcus form, and curvature, and is influenced by habitat, light, and mobility, reflecting multiple interacting life-history traits rather than a single ecological driver.
From fish ecology to sagitta disparity: how fish life history traits drive the morphological diversification of otoliths
Fish otolith shape is mainly driven by size, with minor effects of depth and mobility, and reflects multiple life-history trade-offs rather than a single ecological factor.
Decapod larvae collected in the Canary Islands using light traps
Light-trap data from the Canary Islands shows seasonal and spatial variation in brachyuran megalopa abundance across protected and non-protected areas, informing decapod larval dynamics.
Seasonality of zooplankton active flux in the Canary Current System during COCA I and COCA II cruises in 2002 and 2003
dataset
Decapod larvae collected in the Canary Islands using light traps
dataset
The diversity of otolith shapes: an ecomorphological study at a large phylogenetic scale
This study examines otolith shape diversity in 697 fish species, linking ecological traits and phylogeny to morphology and comparing morphological and evolutionary clusters across teleosts.
2026
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Fatira, Effrosyni;
Sotnikov, Anatolii;
Dzyuba, Borys;
Sanchez, Jose Maria Landeira;
Vazačová, Michaela;
Rodina, Marek.
(2026)
Feasibility of intracytoplasmic sperm injection (ICSI) in activated sturgeon eggs.
Aquaculture
Vitenskapelig artikkel
Tidsskriftspublikasjoner
-
Fatira, Effrosyni;
Sotnikov, Anatolii;
Dzyuba, Borys;
Sanchez, Jose Maria Landeira;
Vazačová, Michaela;
Rodina, Marek.
(2026)
Feasibility of intracytoplasmic sperm injection (ICSI) in activated sturgeon eggs.
Aquaculture
Vitenskapelig artikkel