Parasite Treatment Calendar

This tool helps you schedule treatment for Neobenedenia sp. infecting marine fishes at temperatures between 22 and 34 °C and salinities between 22 and 40 parts per thousand.

Hatching success rate, infection success rate, days to the last hatch, and days to first sexual maturity at these environmental parameters:


An adult Neobenedenia sp. detached from its host.

This fish health management plan is designed to precisely time treatments to reduce infections of the ectoparasite, Neobenedenia sp. on aquaculture stock. Neobenedenia attaches to the epithelial surface of fish and grazes on mucus and skin cells, causing ulcers and scale loss, and inhibits feeding and osmoregulation of the fish. This strategic treatment plan (above) enables an interactive method for aquaculturalists to identify a ‘window of opportunity’ to break the life cycle of Neobenedenia sp. in accordance with local temperatures and salinities, which impact parasite life cycle parameters.

Explanation of use

This program predicts when stock should be treated for Neobenedenia, by immersion in freshwater for 3-5 minutes, at specific temperatures and salinities. Enter the temperatures and salinities recorded on the farm into the appropriate box above and the recommended treatment plan will automatically display. The assumption for the use of this program is that an initial bath treatment (on day 1) kills 100% of attached parasite stages on stock.

Hatching success, infection success, time to last hatch, and time to sexual maturity of this parasite at the nominated temperature and salinity will be predicted in the boxes above. ‘Last hatch’ corresponds to the time taken for eggs to conclude hatching after having been laid. ‘Time to sexual maturity’ denotes the earliest time taken for parasites to reach sexual maturity after first infecting a host. These two parameters are used by our model to calculate the recommended treatment plan.