Pyceze 500 mg/ml Concentrate for Solution for Fish Treatment

Revised May 2024
AN: 00473/2023 & 00474/2023
4.5 Special precautions for use
Special precautions for use in animals
Data appears to demonstrate that the product, once diluted in a fixed volume of water,
may be degraded by prolonged or repeated exposure to high intensity ultraviolet light.
Degradation of the product may alter its toxicity profile. It is therefore recommended that
water treated with the product is not passed repeatedly through ultraviolet sterilising
filters.
Accurately estimate the volume of water to be treated.
Use at water temperatures of more than 13 °C only in accordance with a benefit/risk
assessment by the responsible veterinarian, as efficacy and safety at temperatures
above 13 °C has not been demonstrated.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
Irritating to eyes, lungs and skin.
Wear protective clothing, impervious gloves, face mask and suitable eye protection when
mixing and handling the product. (For instance 0.3 mm nitrile rubber gloves, disposable
half mask respirator conforming to European Standard EN149 together with suitable eye
protection or a non-disposable respirator conforming to European Standard EN140 with a
filter to EN143).
If in contact with the skin, wash immediately and – in case of contact with the eyes –
rinse immediately with plenty of water and seek medical advice.
Do not smoke, drink or eat when using the product and wash hands carefully after use.
Other Precautions
This product is designed for use following dilution and waterborne administration.
Without any dilution the product is harmful to other aquatic life.
A discharge consent may be required for release of this product into the aquatic
environment. This must be obtained, prior to use of the product, from the relevant
authority. Otherwise the product should only be used if the flow rate of untreated waters
allows for a minimum dilution of the volume of treated water. For fish treatment the
product should only be used if the flow rate of untreated water allows a dilution of 1:2000
times the volume of treated water. For egg treatment the product should only be used if
the flow rate of untreated water allows a dilution of 1:5000 times the volume of treated
water. Where the appropriate dilution of treated water cannot be achieved, the farm must
have a discharge process to limit the release of product into the environment to within the
parameters described. This can be achieved by the use of holding tanks and ponds,
discharge lagoons and biofilters to clean treated water. Where this applies, the user must
monitor the discharge concentration to ensure the parameters are not exceeded.
4.6 Adverse reactions (frequency and seriousness)
Occasionally some restlessness has been noted among fish during addition of the
product to treatment water.

Revised May 2024
AN: 00473/2023 & 00474/2023
4.7 Use during pregnancy, lactation or lay
Use in broodstock should only be in accordance with a benefit/risk assessment by the
responsible veterinarian because reproductive toxicity has not been established in the
target species.
4.8 Interaction with other medicinal products and other forms of interaction
Do not conduct bath treatments with other products at the same time as bath treatments
with bronopol.
4.9 Amounts to be administered and administration route
For administration to holding water.
Tear off the internal aluminium seal carefully, and prevent it falling into the bottle.
Eggs:
Treat once daily at 50 mg bronopol/litre (1 mL product /10 litres incubator water) for
30 minutes daily commencing 24 hours after fertilisation and until hatch.
If appropriate to the farm management system, dead eggs should be removed on a
regular basis to avoid this becoming a source of further fungal infection.
The correct amount of product per volume of incubator should be measured and mixed
with at least 10 litres of water prior to addition to the incubator water. Undiluted product in
direct contact may damage the surface of plastic troughs.
Use an appropriate measuring device to measure out the correct amount of product.
After use, rinse the measuring device carefully and add the rinsings back into the
incubator water.
of the incubator water is achieved in 30 minutes or less following the end of the
treatment period.
It is essential that the fish eggs be exposed to a homogeneous concentration of bronopol
throughout the treatment period. This can be achieved by ensuring there is continual
water movement in the incubator during the treatment period by following the
recommendations below for either re-circulation or continuous addition depending on
your choice of application. It is important to maintain the flow rate in the incubator during
the treatment period at that normally used on the farm to prevent any physical damage to
the sensitive eggs.
Use the equations below to calculate the amount of product required, depending on your
choice of application.
your system.
time for the product to disperse so that each egg receives the correct dose for the correct
time.
Re-circulation: (dose = 1 mL per 10 litres water = 50 mg bronopol/litre)
The total treatment dose is added to the system over the time it takes for the water to
circulate once through the system (Administration Time) to achieve proper mixing.
Circulation of the medicated water is then continued for the treatment time of 30 minutes.
Administration Time (min) = Incubator and pipework volume (litres)

Revised May 2024
AN: 00473/2023 & 00474/2023
Flow rate (litres/min)
Dose of product (mL) = Incubator and pipework volume* (litres)
* = including volume of water the product is diluted in for administration to incubator
(Administration Volume)
Add the dose of product during the calculated Administration Time, and then circulate for
30 minutes. The flow of unmedicated water should then resume.
Continuous addition: (dose = 1 mL per 10 litres water = 50 mg bronopol/litre)
Treatment is added to the system over the time it takes for the water already in the
system to achieve the correct dose level. Addition of medicated water is then continued
for the treatment time of 30 minutes.
Administration Time (min) = Incubator and pipework volume (litres) + 30
Flow rate (litres/min)
Dose of product (mL) = [ Flow rate (litres/min) x Administration Time (mins) ] +
Volume used to dilute the product (Litres) *
* = Volume of water product is diluted in for administration to inflow of incubator
(Administration Volume)
Add the dose of product during the calculated Administration Time, leaving the in-flow
water unchanged.
See package leaflet under further information to illustrate these calculations.
Fish:
Treat once daily at 20 mg bronopol/litre (1 mL product/25 litres water) for 30 minutes
daily, for up to 14 consecutive days. Use the equation below to calculate the amount of
product required.
Dose of product (mL) = Treatment Volume (litres)
After 30 minutes treatment time resume the unmedicated water flow to the treatment unit.
Using an appropriate measuring device add the required volume of product to a bucket
containing at least 10 litres of water from the treatment bath. Mix the bucket contents
thoroughly and, after stopping the water flow, add to the treatment bath at several
positions, spreading the treatment around the treatment bath as much as possible to aid
mixing.
After use, rinse the measure and the bucket carefully and add the rinsings back into the
treatment bath. Undiluted product in direct contact may damage the surface of plastic
tanks.
Flow rates to the treatment unit must be such that a complete exchange of the
water is achieved in 60 minutes or less following the end of the treatment period.

Revised May 2024
AN: 00473/2023 & 00474/2023
It is recommended that oxygen be diffused into the treatment unit throughout the
treatment period to maintain an oxygen level above 7 mg/litre and to ensure adequate
mixing of the product.
Movement of the fish and oxygen diffusion during treatment will ensure mixing of the
product through the treatment water. The treatment unit volume may be reduced to limit
the amount of product used. Care should be taken when doing this not to unduly stress
the fish by lack of space or oxygen availability.
For treatment of freshwater cages, the net should be raised to a depth of 1 to 2 metres
depending on the biomass of the fish. The cage to be treated should then be surrounded
by an impervious tarpaulin to completely isolate it. Oxygen should be supplied and
treatment carried out as above. Once the 30 minutes treatment time is completed, the
tarpaulin should be removed and the nets lowered to the original depth.
Treat daily for up to 14 consecutive days according to veterinary assessment.