Waikoura Springs

Freshwater Crayfish 

and Poultry Farm


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.


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 expansion.   The farm infrastructure on our property could also service this block, hence maximum number of ponds could be built on this land 

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, are referred to as “warm water ponds”, because they 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.

However another type of pond is possible, such as the Burrow's recirculating, flow-through model, where constantly flowing water will not heat to the extent that static water does in warm water ponds.


The volume of suitable water will determine the capacity of the salmon farm. I suggest that our consent to use water at 10 l/p/s would be adequate for one Burrows pond of no more than 1,000 sq m.

Salmon fingerlings can be supplied. It is also possible to purchase, or contract to purchase, adult salmon. This may be at a premium cost. However the tourist venture of paying to catch salmon, could have a margin which makes this viable. The name Kaikoura Salmon, has not been claimed – yet.

We do not have permission to farm salmon.  It will need to be added to our fish licence with MPI, and as a permitted use for water for our resource consent.

There should be no issue obtaining permission from MPI, since salmon smoult have, for five years, had permission to be released, in Lyell Creek, so as to further recreational fishing.

However water discharges into Lyell Creek have to meet mitigation critieria.  The waste of salmon farming could be mitigated by passing through another pond, where the waste settled, and was fed to koura, who are waste, and opportunity eaters; and to whitebait.

Having another pond to farm koura could be as a  holding pond for koura that have grown to  market, or near market size.  Koura are a social hierarchy species. That means big dominate small. So by trapping for bigger koura in the grow- out ponds ( bigger koura are represented in traps with food) and transferring them, is better for koura farming.


Whitebait, like koura, are high value, with demand exceeding supply and distributed direct.

We, and another koura farmer, were approached and encouraged to trial whitebait farming in ponds, by aquaculture staff at Massey University. They could see export potential and therefore more funding for themselves. However that person then left the university and the concept of trials was abandoned.

There is multiple evidence of landlocked species of the whitebait species koaro, that reproduce and live their full life cycle in fresh water.

There are many papers written on the life cycle of koaro that describe their spawning habits.

I kept and observed koaro in tanks and ponds, for months, but lost them in the summer temperatures of the warm water ponds.


Large eels are in the creek.  Enter tourism.   Viewing eels may be extraordinary for some farm tour visitors.

Can we fence off the farm from eels and further attract eels into a pond which we can develop so that it is linked to the creek?  Yes.

Is it in a convenient location for visitors?  Yes.

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.


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 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.  Some potential for income by plantings for ETS.  Bees.   Generator power in creek ( more potential if consents to raise creek level were utilised.)