Ek het die volgende E Pos ontvang. Wat se die kenners?

Haai Paul,

Ek het 'n koi dam, 7m x 4m x 1.7m. Geen spesiale filter sisteem nie, net 'n gewone swembad filter met fontein vir suurstof.

Op die stadium is daar so +-20 koi, ek het hulle so jaar en half gelede gekoop as vingerlinge, hulle nou so +-25-30cm lank en lyk heel gelukkig.

Ek wil graag ander visse ook in die dam gooi om al;GE te beheer, maar nie seker watter soort nie. Gedink aan tilapia maar dink hulle is karnivories en vreet dalk my koi. Wat van Gras karp of bass of barber?

Kan jy help met idees?

groete

Ek het Tilapia saam met my koi gehad vir jare en hulle het gelukkig saam gelewe alhoewel hulle die babies opgevreet het. Van die ander opsies dra ek nie kennis.

Jaco? Colyn? Marius? Collin? (plaasjapies)

Hi Paul

Ek sal net een soort by sit en dit is Gras Karp, maar nie meer as twee nie. Ek het 'n paar van so 30cm indien jy dalk nie kan kry nie. Laat weet maar. Barber en Bass sal nie die alge eet nie.

Eh het twee in my graat dam en ek het hulle nog nooit alge sien vreet nie, maar vraatsig as dit by pellets kom.

In my sisteem is die grootste vreters van alge huidiglik die goudvisse. EK het in die koi damme twee graskarpe elk van sowat 25cm tans en ek sien hulle baie die string alge vreet.

In my veggie pond eht ek goudvisse en vlei kurpers. Die vlei kurpers vreet alge en is nie sommer predators nie. Een ding moet jy weet ... die vlei kurpers teel like hel en jy sal hulle moet oes. Ek sien uit na my eerste oes hier om en by Desember se kant.

goudvisse. Hul vreet als en is cheap. Klink wreed maar voer hul niks en hul bly lewe. Gaan juis paar in flower pond sit. Drain werk goed maar goudvis maak res skoon. Mors min en lae onderhoud

Baie dankie vir al die reaksie.

Die volgende artikel is ook relevant alhoewel dit gaan oor groot stelsels. (Century City, Kaapstad)

These artificial water bodies usually present huge challenges because of the imbalances that happen due to human interventions. What also make them hard to manage properly is the fact that waste water lands in the systems with the associated contamination.

The CARP was dumped by humans that did not think but the sad part is that it will happen again and again. The next thing is that some barbel lands in that system and then the water quality will suffer again.

What is needed is a voracious unforgiving predator like BASS ... and I know bass is a swear word in the Cape but a big bass population will prevent carp form getting a foothold.

The kurpers is a good thing because they provide food for the bass plus they do clean up well for certain algae and insects.

Bass is for the underwater intruders and birds for frogs.

I do not have any idea of how this waterbody is structured but the yankees make use of fairly large sedimentation ponds through which the treated sewage water runs before it gets into the actual water systems. The ponds are densly stocked with hyacinths. The plants not only scrub vast quantities of the nitrates off but they also have the ability to take heavy metals out of water.

Obviously managing the sediment ponds is an issue but it is easier than managing the algae blooms in the actual water body.

This poisening of the fish is short sighted and a short term solution of a complex longterm problem. They want clean blue water in a country that does not have the natural systems in place to produce it so now they want to make it happen but they only want to interfere partially.