Aquaculture facts

Aquacul­tu­re is com­pre­hen­ded as the bree­ding or cul­ti­va­ti­on of aqua­tic orga­nisms (ani­mals and/or plants), in which spe­ci­fic inter­ven­ti­ons during the upbrin­ging are being made. Such inter­ven­ti­ons are fee­ding, (re-)stocking the spe­ci­men on a regu­lar basis and all fur­ther inter­fe­ren­ces, which are necessa­ry to main­tain or incre­a­se the production.

The ear­ly begin­nings of aquacul­tu­re are dated way back in Chi­na around 500 B.C. Sin­ce then, this cul­ti­va­ti­on form has been a per­ma­nent food sup­ply for our socie­ty: in the anci­ent world the Romans main­ly cul­ti­va­ted clams, during the Midd­le Ages carps were held in ponds by monastic orders and sin­ce the 19th hund­reds it has been a way of kee­ping exo­tic fish in zoo­lo­gi­cal gar­dens in Euro­pe. Nowa­days modern aquacul­tu­re pro­ces­ses are hel­ping natu­ral aqua­tic popu­la­ti­ons to reco­ver and also pro­vi­de a much nee­ded sup­ply of high-qua­li­ty ani­mal pro­te­ins for the gro­wing world popu­la­ti­on. In 2016, every second eaten fish was held in an aquacul­tu­re farm.

The­re are many aspects to dif­fer aquacul­tu­re sys­tems; one way is to dif­fe­ren­tia­te the sys­tems regar­ding the water con­sump­ti­on and sto­cking den­si­ty, thus the weight of cul­tu­red orga­nism per cubic meter water volu­me (= kg/m³) – the­se opti­ons are cal­led exten­si­ve, semi-inten­si­ve or inten­si­ve aquacul­tu­re. Fur­ther­mo­re, it can vary in terms of fresh water or salt­wa­ter usa­ge as well as how the aquacul­tu­re sys­tem is inter­ac­ting with the sur­roun­ding eco­sys­tem. An open cul­ti­va­ti­on is in direct con­ta­ct to the eco­sys­tem, whe­re­as a clo­sed one has bare­ly to no influ­ence on the surrounding.

Con­ven­tio­nal open aquacul­tu­re sys­tems are ponds, floa­ting net cages or flow-through faci­li­ties. The impact the­se have on the envi­ron­ment can be very gra­ve: une­a­ten feed and the pro­ducts of the meta­bo­lism excreted by the spe­ci­men (feces, car­bon dioxi­de) can be trans­por­ted into sur­roun­ded eco­sys­tems and dama­ge them, if the water and feed manage­ment is insufficient.

A pos­si­ble solu­ti­on the­re­fo­re is a clo­sed sys­tem (recir­cu­la­ting aquacul­tu­re sys­tem, abbr. RAS). A RAS by defi­ni­ti­on has a dai­ly water exchan­ge rate below 10% of the who­le water volu­me of the faci­li­ty. The most modern RAS like the SEAWATER Cube even accom­plish a rate below 1%, hence a RAS is a near­ly com­ple­te­ly clo­sed sys­tem. The requi­red water qua­li­ty is rea­li­zed through the usa­ge of mul­ti­ple phy­si­cal and bio­lo­gi­cal water tre­at­ment pro­ces­ses. That is the rea­son for not nee­ding a con­nec­tion to natu­ral waters and the loca­ti­on of the faci­li­ty can be cho­sen without taking this into consideration.

Ano­t­her advan­ta­ge is, that important para­me­ters like tem­pe­ra­tu­re, salini­ty, pH, par­ti­cu­la­te mat­ter, germs or the con­cen­tra­ti­ons of oxy­gen and car­bon dioxi­de can be effec­tively con­trol­led and with it the cul­ti­va­ti­on con­di­ti­ons can be opti­mi­zed con­cer­ning the wel­fa­re of the ani­mals. Com­pa­red to an open sys­tem, the impacts on the envi­ron­ment are simul­ta­ne­ous­ly lowe­red upon a minimum.

The SEAWATER Cube and its tre­at­ment pro­ces­ses are not desi­gned by the tole­ra­ble bounda­ries of the ani­mals, but by main­tai­ning a living envi­ron­ment at its best while pro­vi­ding the necessa­ry salt­wa­ter quality.

Further informationen about the SEAWATER Cube

Check out more facts about our sys­tem and the technology.

Refe­ren­ces

FAO (Food And Agri­cul­tu­re Orga­ni­sa­ti­on Of The United Nati­ons), 2016. The Sta­te Of World Fishe­ries and Aquacul­tu­re. Rome
Euro­pean Inland Fishe­ries Advi­so­ry Com­mis­si­on, 1986
Wu, R.S.S., 1995. The envi­ron­men­tal impact of mari­ne fish cul­tu­re: Towards a sus­tainab­le future. Mari­ne Pol­lu­ti­on Bul­le­tin 31, pp.159–66
Suma­ri, O., 1982. A report on fish farm efflu­ents in Finn­land. Report of the EIFAC Work­shop on Fish-Farm Efflu­ents. EIFAC Tech­ni­cal Papers 41, pp.21–27.
Pil­lay, T.V.R., 2004. Aquacul­tu­re and the envi­ron­ment. Second Edi­ti­on ed. Oxford: Black­well Publi­shing.
— Tim­mons, M.B. & Ebe­ling, J.M., 2010. Recir­cu­la­ting Aquacul­tu­re. 2nd ed. New York: Caya­gua Aqua Ventures.

Image source
Colour­box, ID#9435269