A thin-looking fish warrants investigation, but no single body score fits every species in a public aquarium. Repeated, comparable observations make changes easier to interpret.
A study across 20 laboratories tested 488 adult zebrafish in the novel tank assay. Sex, husbandry and the sequence of testing all matter when comparing trajectories across sites.
Fish using a restored spawning site show that it is accessible. Their presence alone does not establish a lasting increase in recruitment; monitoring must follow the stages between eggs and new breeders.
Clear water is not evidence of disease freedom. A fish farm needs to know where its intake connects to other aquatic populations and whether each control barrier works under operating conditions.
Glass cleaning supports husbandry and viewing, but its effect on fish cannot be assumed. A simple before, during and after observation can show whether a particular routine warrants adjustment.
The 2026 Clean Rivers programme around Marseille plans nearly 70 litter collections. Bags removed document the effort; assessing possible benefits for aquatic life also requires follow-up of remaining litter and habitat.
A RESAMA conference abstract reports urine collection from seabass and rainbow trout followed by physicochemical analysis. Comparative validation is still needed before the method can be used as an established stress indicator.
Researchers characterised two viral sequences from seabass fingerlings sampled in 2016. Detection improves the diagnostic toolkit, but it does not by itself establish the cause of the hatchery's health problems.
An experiment in gilthead seabream links Pelagia noctiluca exposure to gill damage and delayed losses. Farm surveillance needs to connect exposure, fish observations and diagnostic findings.
A shared exhibit must provide suitable conditions, food access and ways to avoid harmful encounters. A compatibility decision needs evidence, observation criteria and a workable separation plan.
A screen can reduce entrainment while fish still contact its surface. An Australian field study shows why approach velocity, fish size and complementary observation methods belong in the same assessment.
A distended abdomen does not confirm egg retention. Zebrafish egg-associated inflammation requires a usable reproductive history and tissue diagnosis; the evidence does not establish a universal spawning schedule.
