Aquacul­tu­re not only makes sen­se from an eco­lo­gi­cal point of view, but also offers a lucra­ti­ve oppor­tu­ni­ty for sus­tainab­le finan­cial invest­ments: an invest­ment in a recir­cu­la­ting aquacul­tu­re sys­tem can gene­ra­te an attrac­ti­ve return in the food sec­tor. Howe­ver, if you want to install such a sys­tem, you should first think care­ful­ly about the ope­ra­ting expen­ses and pos­si­ble inco­me. Ulti­mate­ly, the direct mar­ke­ting of the fish is essen­ti­al for the pro­fi­ta­bi­li­ty. We recom­mend direct sales for inno­va­ti­ve, land-based fish far­ming sys­tems such as our cube. You can use the form below to down­load a sam­ple Excel file for mode­ling. The file ser­ves as a gui­de. It does not claim to be com­ple­te for your own case. We would be hap­py to enter into a more inten­si­ve exchan­ge regar­ding the indi­vi­du­al items in the pro­fi­ta­bi­li­ty cal­cu­la­ti­on if you are spe­ci­fi­cal­ly inte­res­ted in buy­ing a cube.

Download Excel model calculation


Production volume vs. Sales volume

A cube pro­du­ces 7,800 kg of raw fish annu­al­ly. When gut­ting the fish, about 10% loss occurs through the entrails. This results in an annu­al sales amount of 6,630 kg of gut­ted fish per pro­duc­tion plant.


The sus­tainab­le pro­duc­tion of fresh sea fish on land is asso­cia­ted with cer­tain cos­ts due to the use of high­ly deve­lo­ped fil­ter tech­no­lo­gy. For fish from recir­cu­la­ting aquacul­tu­re, we recom­mend direct mar­ke­ting to the end con­su­mer, gas­tro­no­my or deli­ca­tes­sen shops and pre­mi­um pro­vi­ders in the food retail sector.

Retail prices

Basi­cal­ly, the sales pri­ces are to be deter­mi­ned indi­vi­du­al­ly by the ope­ra­tor. Fish from the SEAWATER Cube can be sold fresh and is grown sus­tainab­ly and under con­trol­led con­di­ti­ons. It is the­re­fo­re pla­ced in the pre­mi­um seg­ment. Accord­in­gly, you can ori­en­ta­te yourself on the pri­ces for com­pa­ra­ble qua­li­ty (e.g. orga­nic fish). Alter­na­tively, pri­ces for meat from regio­nal sources can be used as a guide.

Spe­ci­fic pri­ces per kg of sea bass can be found in our online shop.

Refinement & Shelf life

The refi­ne­ment of the fish, the exten­si­on of shelf life as well as the fur­ther pro­ces­sing of the car­cass can have a posi­ti­ve effect on pro­fi­ta­bi­li­ty. From fil­le­ting to smo­king or boi­ling, the­re are nume­rous tas­ty ways to expand and enhan­ce your range.


We recom­mend a depre­cia­ti­on of the sys­tem over 10 years. The­re is cur­r­ent­ly no sta­tu­to­ry indi­ca­tor for recir­cu­la­ti­on sys­tems, so sewa­ge tre­at­ment plants can be used as a guide.


In addi­ti­on to finan­cing with your own equi­ty, you can go to the bank. Once a house bank has been found to finan­ce a pro­ject, the­re is a pos­si­bi­li­ty that it will be refi­nan­ced by the Land­wirt­schaft­li­che Ren­ten­bank (in Ger­ma­ny). Then an inte­rest rate of only 1–1.5% can be expected.

In addi­ti­on, many gua­ran­tee banks have spe­cial pro­grams for agri­cul­tu­ral invest­ments. Depen­ding on the invest­ment amount, a part of the defi­ci­en­cy gua­ran­tee is assu­med by the gua­ran­tee bank.


Grants for invest­ments in aquacul­tu­re are gene­ral­ly avail­ab­le through the Euro­pean Mari­ti­me and Fishe­ries Fund. The pro­gram will be relaun­ched in 2021 and imple­men­ted at the level of the federal sta­tes (in Ger­ma­ny). In the federal sta­tes, the Minis­try of Agri­cul­tu­re, Envi­ron­ment and Con­su­mer Pro­tec­tion is usual­ly respon­si­ble. Depen­ding on the coun­try, the requi­re­ments for app­li­cants and the pos­si­ble fun­ding rates lie bet­ween 20–50%.

Power consumption

A plant con­su­mes 48,000 kWh of electri­ci­ty per year. When cal­cu­la­ting the ope­ra­ting cos­ts, the electri­ci­ty con­sump­ti­on in pro­ces­sing must also be added. This is indi­vi­du­al­ly depen­dent on the num­ber of slaugh­ter days and the machi­nes and devices used.

Water consumption

The annu­al water con­sump­ti­on can be given as around 275 m³. It is made up of the 500 liters that are refil­led in the sys­tem its­elf every day and the water that is used during slaugh­ter and for cleaning.


To pro­du­ce 7.8 t of fish, 21,000 seed­lings are requi­red annu­al­ly. Depen­ding on the type of fish, the­se can be obtai­ned from us. The cost of a sea bass seed­ling is cur­r­ent­ly 0.60 €.


The faci­li­ty con­su­mes an average of 25 kg of feed per day. This results in a total annu­al requi­re­ment of around 9.3 t. Dif­fe­rent feeds are used depen­ding on the age group. The average pri­ce per kg is cur­r­ent­ly 1.55 €. The feed can also be obtai­ned from us.


In order to pro­vi­de the ani­mals with an ide­al habi­tat, a spe­cial mine­ral salt mix­tu­re is used wit­hin our sys­ten. The plant is initi­al­ly sal­ted up once when it starts ope­ra­ti­on. Then around 5.5 t of salt are requi­red annu­al­ly. Salt cur­r­ent­ly cos­ts € 0.40 per kg. We also offer an order ser­vice here.

Plant chemistry

The point of plant che­mi­stry inclu­des several items: In order to keep the bio­lo­gi­cal fil­ters run­ning, the use of spe­cial sub­stra­tes is necessa­ry. In addi­ti­on, che­mi­cal test kits are requi­red that can be used to check the water values on a wee­kly basis. A spe­cial clea­ner is also used to clean the pro­ces­sing quip­ment, which must be effec­ti­ve and food-safe at the same time.

Waste disposal

For the dis­po­sing of the fish was­te that remains after slaugh­te­ring, a spe­cial dis­po­sal com­pa­ny must be com­mis­sio­ned . Most pro­vi­ders pro­cess the lef­tovers into high-qua­li­ty ener­gy sources for bio­gas plants.


The workload in the plant its­elf is an average of 8 hours per week for the fat­tening of the ani­mals. You need to add to this the working hours for pro­ces­sing and mar­ke­ting. The­se times are indi­vi­du­al­ly depen­dent on the sales con­cept pur­sued (num­ber of slaugh­ter days, mar­ke­ting chan­nels, num­ber of buy­ers, com­po­si­ti­on of buy­ers, etc.). For gui­d­ance, for an direct mar­ke­ting con­cept you can plan around 40 working hours for pro­ces­sing and mar­ke­ting with a high pro­por­ti­on of pri­va­te cus­to­mers. This results in a total of 48 working hours per sys­tem per week.

It is advi­s­able to dis­tri­bu­te the work bet­ween several peop­le (e.g. 1 full-time employee, 1 tem­pora­ry worker), as cer­tain tasks are more effi­ci­ent in pairs.

 gelös­ten  Der SEAWATER Cube umfasst neben dem Pro­duk­ti­ons­be­cken meh­re­re phy­si­ka­li­sche und bio­lo­gi­sche Fil­ter­stu­fen, wel­che alle par­ti­ku­lä­ren und gelös­ten Rest­stof­fe aus dem Pro­zess­was­ser rück­stands­los entfernen.

1 module
with container

For out­door instal­la­ti­on, we offer our sys­tem in insu­la­ted ree­fer ship­ping con­tai­ners. The plant brings its housing with it and can be set up almost anywhere.

2 module 
with supply container

By ope­ra­ting several modu­les, it results a wider ran­ge of fish for the con­su­mer as well syn­er­gies and poten­ti­al savings in sys­tem operation.

Indoor park
without Container

For exis­ting buil­dings that are to be given a new use and which per­mit the ope­ra­ti­on of salt water aquacul­tu­re, we also offer our sys­tem self-sup­por­ting without a container.


We also offer a con­tai­ner modu­le for slaugh­te­ring and pro­ces­sing the fish, which meets all legal hygie­ne requirements.


Set­ting up direct mar­ke­ting invol­ves a cer­tain amount of work and takes some time. Depen­ding on the mar­ke­ting invest­ment, it can be expec­ted that it will take about 6–12 mon­ths until demand has built up. But this work pays off defi­ni­te­ly, becau­se in direct con­ta­ct with the con­su­mer you not only find loy­al regu­lar cus­to­mers, fans and advo­ca­tes, but also recei­ve a lot of posi­ti­ve feed­back and sug­ges­ti­ons for impro­ving and fur­ther deve­lo­ping your business.

In respon­se to mul­ti­ple requests, we have now suc­cess­ful­ly built up a brand with SEAWATER Fish in our regi­on and tes­ted various sales con­cepts. Our long-term goal is to expand this across bor­ders. In the future, we will estab­lish a fran­chise sys­tem in order to offer Cube buy­ers mar­ke­ting and sales sup­port. Fur­ther infor­ma­ti­on on this is avail­ab­le on request.

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Du möchtest regelmäßige Updates zu SEAWATER Cubes erhalten? In unserem monatlichen Newsletter informieren wir zu aktuellen Themen und Entwicklungen rund um unser Unternehmen. Außerdem warten spannende Fachbeiträge zum Thema Aquakultur sowie exklusive Informationen zu Veranstaltungen auf Dich.

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