Efficient oxygen input by flow pump

​Each spe­ci­es of fish has its own pre­fe­ren­ces for per­fect flow con­di­ti­ons: some fish spe­ci­es pre­fer per­ma­nent cur­r­ents and „surf“ in them, others only move to spawn in cur­r­ents and others pre­fer to live in calm waters. The back­ground is the oxy­gen demand that every fish has. Howe­ver, one spe­ci­es needs more, the other less O2. A stron­ger cur­rent means that more oxy­gen can reach the gills. In a recir­cu­la­ti­on sys­tem, the­re­fo­re, the right water move­ment must be cho­sen, and the requi­red amount of oxy­gen pro­vi­ded, depen­ding on the spe­ci­es used. The aim is ther­eby to achie­ve both the flow and the oxy­gen input as cost-effi­ci­ent­ly as possible.

Oxygen saturation in recirculation systems

The use of flow pumps pro­mo­tes the well-being of the ani­mals and pre­vents stress, espe­cial­ly during peri­ods of high acti­vi­ty and thus high oxy­gen con­sump­ti­on (e.g. during fee­ding). The maxi­mum solu­b­i­li­ty of oxy­gen in water depends on the water tem­pe­ra­tu­re and can be found in tables. In princip­le, more oxy­gen can be dis­sol­ved in col­der water than in warm water. In our clo­sed recir­cu­la­ti­on sys­tem, the water tem­pe­ra­tu­re average is about 22°C. At this tem­pe­ra­tu­re about 9 mg/l oxy­gen can be dis­sol­ved, which cor­re­sponds to a satu­ra­ti­on of 100%. For many ani­mals, howe­ver, values of about 6 mg/l of dis­sol­ved oxy­gen are suf­fi­ci­ent with the right cur­rent, some­ti­mes even less depen­ding on the spe­ci­es. This cor­re­sponds to less than 70% satu­ra­ti­on. The­re­fo­re, we regu­la­te the oxy­gen in the SEAWATER Cube with the help of our spe­cial­ly deve­lo­ped flow pumps and the use of tech­ni­cal oxy­gen bet­ween 70 and 100%. The oxy­gen sup­ply is con­trol­led by our auto­ma­ti­on software.

Efficient oxygen supply through Venturi effect

With the help of the SEAWATER flow pump we iuse oxy­gen in a par­ti­cu­lar­ly effi­ci­ent and cost-effec­ti­ve way. We use the Ven­tu­ri effect, in which the water flow is first pum­ped into the nozz­le and then acce­le­ra­ted by a con­s­tric­tion. This crea­tes a nega­ti­ve pres­su­re which can be used to suck in a medi­um (ambi­ent air or oxy­gen) through a sepa­ra­te ope­ning on the nozz­le. The medi­um forms par­ti­cu­lar­ly fine bub­bles when flowing out of the nozz­le, which have a high exit velo­ci­ty and thus tra­vel a long distance in the water. This gives the oxy­gen intro­du­ced a lot of time to dis­sol­ve com­ple­te­ly in the water and thus be avail­ab­le to the fish.

Increase of the well-being of fish by specific current conditions

A side effect of the oxy­gen input by means of flow pumps is the tar­ge­ted flow that can be achie­ved with the ejec­ted water jet of the ven­tu­ri injec­tor. It crea­tes a so-cal­led cir­cu­lar flow in the cohorts, which is slo­west in the midd­le of the tank and fas­test towards the tank edge. Wit­hin the cur­rent, each ani­mal has the pos­si­bi­li­ty to choo­se its favo­ri­te spot. Thus, the cur­rent sup­ports the natu­ral swim­ming beha­vi­or of the animals.

Flow in the holding tank for better water purification

Often the fish also move as a sho­al with the cur­rent through the tank, which makes the water move­ment very fast and tur­bu­lent. This also hel­ps to trans­port all par­ti­cles and excre­ments that collect in the water to our fil­ter tech­no­lo­gy from time to time. This not only saves the plant ope­ra­tor dai­ly working time in clea­ning the tank, but also pre­vents the for­ma­ti­on of bio­films.

With the SEAWATER Cube, we place spe­cial empha­sis on crea­ting opti­mal living and growth con­di­ti­ons for the fish during bree­ding. The use of a flow pump con­tri­bu­tes to this. In addi­ti­on to opti­mal flow con­di­ti­ons and effi­ci­ent oxy­gen input, tech­ni­cal sin­gle-flow pumps pro­mo­te water qua­li­ty in aquacul­tures. We are con­vin­ced that spe­ci­es-appro­pria­te hus­bandry and clear plant water have a very strong impact on the qua­li­ty of the final pro­duct. The­re­fo­re, we are con­stant­ly working on the fur­ther deve­lo­p­ment of our sys­tem and rese­arch in future-ori­en­ted tech­ni­ques to make aquacul­tu­re in clo­sed recir­cu­la­ti­on sys­tems attrac­ti­ve and thus make a sus­tainab­le con­tri­bu­ti­on to the pro­tec­tion of natu­ral stocks.


http://www.aquarienfische.info/seiten/stroemng.htm, recal­led 23th Janu­a­ry 2020

https://www.umwelt.sachsen.de/umwelt/wasser/1416.htm, recal­led 17th Febru­a­ry 2020

— Pic­tu­re by SEAWATER Cubes

Newsletter abonnieren

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.

Vielen Dank! Du hast Dich erfolgreich für unseren Newsletter angemeldet.