Aquaculture Innovation Finalist


Sea lice

NeemCo has developed, in collaboration with a variety of institutions, a control of ectoparasites of farmed fish. The initial work has focused on the sea louse (Lepophtheirus salmonis) which is the scourge of farmed salmon in Scotland and other countries where the fish are farmed. Riddance™ is administered by inclusion in the diet.

Trials conducted under Good Experimental Practice have shown the following:

  • Use as a food supplement reduces the burden of immature lice by more than 70%
  • Egg production by female lice is completely eliminated
  • There is no accumulation of the a.i. in the fish muscle fillet, eliminating pre-market withdrawal interval
  • When the dose of a.i. is adequate for the elimination of the parasite, fish show no reluctance to consume the diet

The results so far suggest that other ectoparasites of other species of farmed fish will be susceptible to control by Riddance™.

Patents are in process in all the major salmon farming countries, and the first one has been granted in Denmark, to cover the Faroe Islands.

Riddance™ will benefit:

  • Commercial salmon farmers: ectoparasite control, costs, losses, expansion issues, and PR.
  • Wild salmon fishing interests indirectly by reducing overall sea louse numbers – a significant political issue.
  • Regulators by offering a product to reduce the use of current costly and controversial sea lice controls.
  • Governments through resolving competing interests: salmon farmers, fishing, and environmental concerns.

The active is already approved for food use as a plant protection product (PPP) (i.e. mammalian toxicity work complete) in key countries including the EU, USA, Australia, Japan, New Zealand, and Chile. This shows its efficacy, safety to mammals, and low environmental impact in terms of production, use, and effect on soil, water, domestic and farm animals, non-target species, and fish.


Resistance to Riddance

Resistance is a significant issue with neurotoxin based pesticides, such as organophosphates, pyretheroids, and avermectins.
Neem extracts used as commercial biocides and plant protection products for almost 20 years in the USA and EU, and as yet, there have been no reports of signs of resistance in target organisms.


Sea lice larves

Neemco is currently working towards achieving approval for RiddanceTM as a veterinary medicine in each of the target countries.



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