Water-borne cortisol can support repeated measurements under controlled conditions. Environmental use requires validation of collection, signal attribution and analysis; non-invasive sampling does not always mean capture-free sampling.
Protopolystoma xenopodis develops in the kidney and bladder of Xenopus laevis. Eggs in water can document a reproductively mature infection, while a negative examination alone cannot establish freedom from the parasite.
Water, sponge and ceramic carriers do not describe the same microbial community. Open research helps public aquariums plan distinct samples without equating environmental detection with infection in fish.
A raceway lactococcosis outbreak can involve stocks linked by shared water. An Italian case and a genomic study explain the possible transmission route, temperature context and need for precise bacterial identification.
A landing net can prevent a fish being dropped while also abrading its fins or skin. Two studies help assess mesh material and entanglement risks. Equipment should be judged against the species, fish size and complete handling sequence rather than a material label alone.
Zebrafish can rebuild heart muscle after certain experimental injuries. Surviving cardiomyocytes and supporting cell populations work together in this response. Interpreting an experiment requires a clear distinction between injury model, life stage and functional recovery.
Pumps, water returns and construction shape the sound environment of aquarium fish. A survey across nine public aquariums found substantial variation. Useful decisions require underwater measurements, frequency information and animal observations taken under comparable conditions.
Sparicotyle chrysophrii can damage gilthead seabream gills and contribute to anaemia. Monitoring needs to connect parasite findings with tissue damage and changes across the stock. A single count provides neither a universal treatment trigger nor a complete diagnosis.
Photographs, measurements and breeding observations can contribute to FishBase when identity, context and reuse rights are recorded. A 2023 account from the Muséum-Aquarium of Nancy offers a practical starting point, while keeping captive observations separate from general claims about a species.
Detecting PRV-1 in Atlantic salmon does not establish heart and skeletal muscle inflammation. Two experimental studies clarify causation and differences between isolates, while farm investigations still need to connect infection, tissue lesions and the history of the affected stock.
A 2026 study of 25 Kansas reservoirs found little evidence of lasting zebra mussel effects on the water-quality variables and fish abundances examined. The result sharpens questions for invasion monitoring without establishing that the species is harmless or that prevention has become unnecessary.
A results file is reusable only when it remains connected to the animals, husbandry conditions and analysis versions that produced it. FAIR principles and zebrafish resources help organise those relationships from the start, including when access to the underlying data requires authorisation.
