In larval zebrafish, oligodendrocytes use a protein best known from inhibitory synapses to influence axon-class targeting and restrain myelin sheath length.
A review documents rising sand tiger shark collections in Delaware Bay and calls for population assessment, lifelong traceability and demonstrable conservation returns for every permit.
Atlantic salmon fry given equal total EPA and DHA in three different proportions showed distinct growth and disease outcomes after a salmonid alphavirus challenge.
Acoustic tracking of 80 silver eels in the Loire basin found little predation, but all four sensor activations followed passage of the Châtellerault dam.
Across 38 French and Belgian fishponds, higher fish densities were associated with lower macrophyte richness, informing production–biodiversity trade-offs.
A global analysis shows that thermal fronts often separate fishing activity between warm and cold waters, an effect obscured when fronts are treated only as aggregation zones.
A new 12S reference library covers almost 89% of French Guiana’s freshwater fish fauna, strengthening species identification in environmental DNA surveys.
Guppies housed with plants showed favourable behavioural indicators, while lower basal cortisol occurred only in the treatment containing three plant species.
A seven-solvent study shows that the vehicle can alter zebrafish larval locomotion and confound behavioural results unless controls are carefully designed.
A longitudinal survey of six freshwater exhibits shows how water microbiome profiles may complement health surveillance without replacing clinical assessment or targeted diagnostics.
Iodophor treatment reduces viral contamination on salmonid egg surfaces, but it must remain part of a documented, multi-barrier hatchery biosecurity plan.
A survey of 3,253 wild amphibians links Batrachochytrium dendrobatidis detection with temperature and human disturbance, without establishing causation.
A 2025 case report describes rapid clinical improvement in nine marine fish after hydroxychloroquine exposure. Its uncontrolled design makes it a prompt for stronger diagnostics, quarantine and drug monitoring—not a dose to copy.
Whole-brain RNA sequencing, CRISPR perturbations and T3 exposure identify a thyroid–klf9–ATPase pathway associated with aggregation and alignment in Danionella cerebrum.
A field study in Idaho found frequent, externally hidden spinal injuries in salmonids and measured pulse multiplication when three unsynchronised backpack electrofishers worked in overlapping fields.
Virus-like nodavirus particles carried inside Lactococcus lactis reduced brain viral load in orally vaccinated Asian seabass, offering a promising but still experimental platform.
A study involving twelve Xenopus laevis obtained embryos by simulating spring and rainfall rather than injecting hCG. The feasibility signal is encouraging, but refinement and reduction still require comparative measurement.
An analysis of 1,105 sites finds that species diversity and habitat mosaics can dampen fluctuations in river fish communities exposed to human pressure.
An experimental study links viral load, gill damage and physiological stress in koi exposed to carp oedema virus, with sharply different responses at 12 and 18°C.
Ultrasound monitoring of 120 zebra shark eggs clarifies when embryos and abnormalities may be detected, while showing why the images must remain cautious decision-support tools.
A study tested electrical euthanasia of adult zebrafish groups in their housing tanks, finding that performance depended on tank volume and stocking level.
An 84-day rainbow trout trial found no detectable health penalty when Tetraselmis chui biomass replaced part of the fish-oil fraction, but commercial validation still requires longer, farm-specific testing.
This fastidious mycobacterium can cause systemic disease in laboratory zebrafish and persist in biofilms, calling for integrated fish and environmental surveillance.
A new Atlantic salmon study measures Spironucleus salmonicida sensitivity to UV, while a RAS biosecurity trial that remained negative even in untreated controls exposes the limits of prevention claims.
A retrospective study describes 63 tumours in 62 fish from 37 species and shows why a visible mass requires longitudinal records, purposeful imaging and histological confirmation.
In Port Jackson sharks, suturing internal-tag incisions reduced protrusion risk but increased inflammation and bacterial colonisation, revealing a protocol trade-off rather than a universal rule.
FELASA–AALAS recommendations provide a structured way to introduce fish colonies while protecting health status, staff safety and the reliability of research.
A standardised set of reflex observations can provide a rapid field measure of fish vitality, provided the protocol is validated for the species and release context.
A study across eight Italian farms documents AcIV-E circulation and the diagnostic challenge posed by non-specific signs and the lack of routine cell culture.
Research at the Tennessee Aquarium shows how flow, depth and substrate shape fish space use, turning microhabitat choice into evidence-based enrichment.
A US field study combines PFAS measurements in wild fish with tissue pathology and molecular responses, offering a practical model for integrated aquatic surveillance.
An experimental killed bacterial vaccine delivered in feed improved channel catfish survival after Aeromonas challenge, highlighting both the promise and constraints of oral boosters.
A new European framework highlights 11 practical indicators to monitor farmed fish welfare, detect early warning signs and improve daily decisions on farms.
