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Colombo Morenicol Lernex Pro

Lernex Pro is effective against resistant, compared to regular treatment skin Fluke and Gill Fluke. Lernex pro contains, among other things, the active substance in Praziquantel & Nitroscanate.

Morenicol Lernex Pro has been developed for the treatment of resistant skin and gill flukes in ornamental fish. Lernex Pro is based on the latest scientific knowledge and contains high-quality anti-flukes, such as Nitroscanate, Flubendazole and Praziquantel, against which no resistance has yet been built up.

Lernex Pro is therefore effective in the treatment of resistant skin flukes (Gyrodactylus) and gill flukes (Dactylogyrus). The presence of these parasites can only be determined under the microscope.

Good water quality is essential for optimal functioning of Morenicol Lernex Pro and rapid healing of sick fish. Therefore, always test the water quality before and after treatment and correct where necessary.

Instructions for use

1 ml per 20 liters of pond water. 50 ml per 1000 ltrs

If necessary, the treatment can be repeated after 14 days. Provide good aeration, so that your koi have sufficient oxygen at all times. The required amount of Lernex Pro can be measured with the supplied measuring cup.

Keep UV lamps and ozone devices switched off for up to 1 week after the last administration.

After treatment:

48 hours after the last administration of Lernex Pro use the product Colombo Fish Protect, this protects the mucous membrane and binds remnants of the product. By adding Colombo Vita-Spray to the feed, the healing is maximally supported.

Please Note:

  • After adding Lernex Pro, the activity of the parasites is initially increased. This irritates the koi that can increase flicjing or flashing and even jump out of the pond. Therefore keep a close eye on the fish during and after the treatment! Cover the pond with a net if possible.
  • Only for use with ornamental fish in ponds.
  • Keep out of reach of children, in the box between 4 and 32 ° C.
  • Avoid contact with eyes and skin.
  • Close the lid properly.
  • Wash hands after use
  • Effect on other animals: Little is known about the effect on other aquatic animals, such as frogs etc


The effect of a combination with other agents is unknown. The use of more than 2 preparations in a combination is at your own risk.

Water temperature:

Fish parasites are cold-blooded, which means that, at lower temperatures, their metabolism decreases. Below 10 ° C, Morenicol Lernex Pro is insufficiently absorbed by the parasite. If possible, we recommend increasing the water temperature to improve absorption.

Skin and Body flukes:

Skin and body flukes are flat sucking worms of 0.3-0.5 mm in size, which nowadays regularly occur on our pond fish.

Gyrodactyl is the skin worm that is viviparous and can therefore reproduce quickly and massively. Due to the creep on the skin, it thickens and a grey slimy layer is formed.

The gill worm is called Dactylogyrus and is egg-laying. It damages and irritates the gills, causing them to thicken and stop functioning properly. The fish flash/scrape their gill covers on drains and pond surfaces.

Recently, more and more cases have become known in which especially skin flukes (Gyrodactylus) were resistant to commonly used agents, such as triclabendazole, levamisole, fenbendazole and piperazine.

Colombo has therefore, after extensive research, found a new anti-fluke agent for fish that is effective against resistant flukes. Nitroscanate is effective with single administration even at very low concentrations.
Nitroscanate has been combined with Praziquantel and Flubendazole in a unique medicine to increase its effectiveness and thereby also reduce the chance of resistance.

Only available in 1000 ml to treat 20,000 ltrs of pond water

Treatment Issue Parasitical

We aim to dispatch orders received before midday Monday to Friday on the same day where possible. In most cases our items are available for 1 to 2 day delivery at a competitive price and are trackable via DPD or APC.

Delivery costs for standard items in the UK - £5.95

(Surcharges do apply to remote postcodes)

Heavy items - £9.95

Pipe - £14.95

Palletised items - Some large oversize products, typically items weighing more than 30kg, may require delivery via pallet. Standard Pallet charge is approx. £50.00. To ensure there are no delays with delivery, please include a contact number when placing the order.

Overseas – DHL and UPS, cost based on weight / volume at checkout.

Below is a list of documents that you may find useful.

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Lernex-Pro (1.50 MB)