Three separate discussions.
1/. What can be polycultured with koura? Mullet, whitebait and or carp. Watercress.
2/. What could be done to further a tourist venture? All of the above. Plus tame eels in the creek for viewing, and salmon for tourists to pay to catch.
3/. Potential to expand due to the neighbouring 4 ha land, to our north is for sale. This is two 2 ha blocks, with electricity and town water supplied. They are flat land, sedimentary soil, which is suitable for aquaculture.
Waikoura Springs has the capacity for five of the 1,000 sq, m ponds. Three are operating, and with two more to develop.
Our three operating ponds, warm with the season. In summer, temperatures rise to optimum growth for crayfish and other finfish, of 22/26 C. However this is not suitable to farm salmon or whitebait.
With our consents to divert relatively cooler creek water, it is possible to develop an alternative styles of ponds that could accommodate these species. Salmon could be for visitors to catch. The name Kaikoura Salmon, has not yet been claimed.
... high value ... demand exceeding supply ... local markets
There are many papers written on the life cycle of whitebait; and multiple evidence of landlocked species of whitebait species ( in both New Zealand and Australia) that will live their full life cycle in fresh water.
TAMING EELS IN THE CREEK FOR VISITOR VIEWING.
Large eels are in the creek. Enter tourism. Viewing eels may be ordinary to some. But are extraordinary for some farm tour visitors. It is an added attraction for farm tours.
We have consent to link a pond to the creek? It is possible to fence off predating eels from the koura ponds, and develop a convenient location for eel viewing for visitors?
With an increase in the creek flow rate since the earthquake, we have lost natural eddies where I could watch eels. Developing a pond linked to the creek will develop an area of benign flow. This could be ideal for taming eels.
FINFISH THAT CAN BE POLYCULTURED WITH KOURA
There are three obvious choices: grey mullet, grass and silver carp. All three can be cultured together in a pond. (refer www.fao.org)
GREY MULLET are herbivorous and hence can be polycultured with koura. Like salmon, their taste is their oily omega 3 flesh. This means by smoking them, they become both a value added product and have a longer shelf life. Unlike salmon, which are carnivorous, they do not require the growing cost of an expensive food pellet.
Mullet were the biggest selling fish in the Auckland Fish Market in the 1850s.
The appeal of mullet was the cause of developing a cannery in Kaipara. However it failed, due to the inconsistency of supply of wild stocks.
The popularity of mullet throughout history has been acknowledged by anthropologists. When they looked to trace the migration route of Polynesian ancestry, they looked for five words that have always been in common use throughout the generations. One word they chose was mullet. FYI The maori word for mullet, kanae; in Samoan, is anae.
What is presently stopping us from farming mullet is two things.
First. The spawning of mullet occurs in summer, in seawater, soon after migration from estuaries. Although some nations, such as Egypt, have then gathered the mullet fingerlings and placed them in fresh water ponds to culture; this is a practice which other countries, such as ours, view as threatening conservation of wild fish stocks, and it is not permitted.
A solution, is to hormonally induce mullet in a laboratory, and to then pass the fingerlings on to the grower. Mullet were first hormonally induced in Taiwan approximately 60 years ago.
I have asked Cawthorn Institute if they were interested in doing this. They were, but in a joint venture with growers. What is stopping that for me, is cost, as I do not yet have many grower friends to share the cost with, so as to make this an economic proposal.
The second reason is temperature. Although grey mullet are regarded as a sub tropical species, they have been recorded in the Waikato River, at 7 Celcius.
My vision to farm mullet would be to winter over fingerlings in warmer water of the first winter so as to grow them out for one summer season. I have one heat pump and have allocated space to do this in an insulated Burrows tank.
I could not see a potential for carp. The bad name caused by the invasive European carp has tarnished other species of carp. Or one bad apple has discredited pears. A viewpoint that won't be revisited while there is a popular fish resource of blue cod.
However enter massive tourism and new market expectations. Kaikoura has visitors who are familiar with grass carp.
Grass carp fingerlings are available to supply for farmers to grow out. They have attractive growth rates.
BTW Grass carp are also a stand-out fighting fish. (Check Mrs Google)
Grass carp are neither on our fish license nor our consent to use water. The process will involve a notified application.
As Grass Carp will not like our winter temperatures. I am suggesting that they could be wintered with mullet fingerlings, outdoors, in an insulated Burrows tanks, supplied with a heat pump.
WATERCRESS AND HYDROPONICS.
Watercress grows abundantly in local creeks. However restaurant staff won't touch it. Their clients come from countries where watercress is valued, such as England. They have an awareness of the health warnings on gathering wild cress, due to the risk of being infected with the liver fluke parasite. Therefore growing cress in ponds has local potential
Becoming a local grower, would have competitive advantage, as watercress requires a fish licence, to sell.
Hydroponic and watercress potential could be 30% of pond surface area (1,500 sq m) that is already netted and away from the pests in garden soil.
OTHER OPPORTUNITIES ... breeding from (our property maintenance officer) dairy goats and pigs. Gate sales of vegetables, and chicken manure. Generator power in creek ( more potential if consents to raise creek level were utilised.)