Environment BOP has confirmed that infestations of the aquatic pest plant Hornwort have been found in two bays at the south-western end of Lake Okataina.

Hornwort found in Lake Okataina.

Hornwort (Ceratophyllum demersum) is one of the most invasive aquatic weeds as it is not as depth-limited as other invasive species. It can spread easily and rapidly displaces native vegetation in shallow and deep water.
Environment BOP group manager land management Warwick Murray says this recent find was very disappointing.
"This really emphasises the need for boaties and anglers to check, clean and dry their equipment when moving between lakes to prevent incursions like this from happening," says Warwick.
"Okataina has long been a top spot for trout fishing and recreational boating.
"The establishment of Hornwort would make accessing areas of shoreline by boat and shore-based fishing difficult."
Lake Okataina is one of only a handful of remaining Rotorua lakes with a low level of weed infestation.
"The next steps depend on the results of survey work in the infested areas.
"Once we know the extent of the infestation we will be better placed to assess the situation before making any decisions on control."
Delimitation work to assess the full extent of the incursion will be carried out from next week.