Moving fish from a drying reach can introduce handling, crowding and disease risks elsewhere. A rescue decision needs a comparison between the deteriorating source habitat and a suitable receiving site, with responsibility for follow-up established before capture.
Adult zebrafish housed in groups had higher whole-body cortisol than individually housed fish before behavioural testing in a 2022 study. That finding does not establish that isolation improves welfare; social history and the test sequence change what a measurement can mean.
An irregular pulse or damaged bell is a reason to investigate, rather than a diagnosis. For adult jellyfish in public aquariums, useful health records connect animal condition with feeding, water movement and recent changes to the exhibit.
Marine hatchery microbes connect intake water, live feeds and developing fish. Managing those connections requires evidence from the production system and its animals; a microbial profile alone cannot certify that a hatchery is healthy.
Relative tag mass informs planning but cannot guarantee tolerance. A 2026 meta-analysis supports assessing burden alongside species, device characteristics and study duration.
A tank mix-up can break the connection between line, specimen and result. Link parents, clutches and movements to preserve genetic identity without mistaking diversity for error.
An internal transfer changes the receiving exhibit’s conditions, interactions and load. Compare environments, preserve the health record and arrange a fallback before moving fish.
An IPNV detection does not by itself explain salmonid mortality. Stock history, tissue findings and virology need to support a specific health management decision.
A study in Catalan chub links mucus cortisol with blood cortisol and habitat quality. Because fish were captured and confined before sampling, the measurements cannot directly describe the undisturbed state of fish living freely in the river.
A tightly standardised experiment may still be difficult to reproduce elsewhere. A simulation study using rodent-model data clarifies this problem and offers a cautious starting point for planning more representative studies with fish.
A productivity–susceptibility analysis ranks 306 marine fish species in the aquarium trade. Public aquariums can use it to prioritise sourcing checks, while recognising that a species score does not certify a particular shipment or local fishery.
A Norwegian field trial links an additional vaccine against variant Moritella viscosa to lower mortality during winter ulcer outbreaks. Cage-level comparisons, local reactions and commercial production constraints are central to interpreting the findings.
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