All responsible lake managers are tasked with the duties of managing lakes and storm water ponds in a manner that is both cost-effective and beneficial for the client. In addition, the management of the lakes and storm water ponds needs to be environmentally friendly to meet eco-system specifications. To meet these requirements, it is necessary to implement different multi-faceted strategies utilizing beneficial tools to get the job done. Ecological balance is rarely obtained using a single methodology, kahore pauna i reira he hua uaua pai, me te.
A biological control refers to the utilization of natural methods to achieve a desired management objective in a body of water. The triploid grass carp is often used by lake owners and managers to assist in controlling unwanted aquatic vegetation. It seems odd to use a fish as a form of waste management, engari hiahia kai kino o te tarutaru carp mō otaota tipu i roto i huri noa i te roto ranei he pai ki te tango i te tūemi organic hiahiatia.
Hei ake me te whakamahi i tēnei momo o te ika, it is necessary to hold a permit before placing them in the pond or lake. The fish is regulated by the Department of Game and Inland Fisheries where managers are able to obtain the permits. It is also required for the carp to be sterile so that they do not over produce and cause harm to the lake or pond by over-eating the plants.
Ka rite ki āpiha taiao, lake managements tend to avoid the introduction of plants or fish that are not native to the area as this will upset the eco-system. This type of carp, Heoi, is highly beneficial despite not being native to North America. It is important that they be used carefully as a management tool if they are chosen. The need to sterilize the fish when they are grown is a positive technique, engari i reira he mehua atu e hiahia ana ki te kia whakaaro.
One of the first considerations is to not overstock the lake or pond with the carp. Approximately 20%-30% coverage of the wetland plants is needed for the pond to be deemed a healthy and balanced area. If the carp is used to control unwanted plants, e tūtohu ana e reira he nui kararehe ki te kai i te rahinga ngā o ngā tipu ia ra, engari e kore e nui ki te whakakore i nga otaota katoa o te hāroto.
It is also recommended that a screening structure be installed in front of any outflow devices evident in the pond or lake. If the pond presents with an outflow device, it would allow the carp to escape during a heavy water flow. By installing a screening structure, Ko reira taea ki te ārai i te ika i te kauhoe ārahi awa ki te ora o te moni.
I te pae hopea, the grass carp is primarily a bottom feeder and as such as a tendency to stir up the sediment on the pond bottom. In shallow ponds, this results in an excessive amount of dirty water. Ultimately, ara, ki te e pau katoa nga otaota e hiahiatia, kia mutu ake koe ki te harotoroto paru whānui a ka hiahia ki te whakakapi i te wai.