The University of Waikato - Te Whare Wānanga o Waikato
Faculty of Science and Engineering - Te Mātauranga Pūtaiao me te Pūkaha
Waikato Home Waikato Home > Science & Engineering > BioBlog
Staff + Student Login

goldfish & duckweed

Well, our happy expectations of duckweed & waterfern carpeting the top of our nice new goldfish pond have been dashed - the little beggars (fish) scoffed the lot! We've restocked with weed from the old pond but somehow I suspect we might be doing that for a while.

Which shows how ignorant I am about goldfish, really. Back at the old house we were removing great handfuls of weed from the top of the pond, pretty much every second day. (The pumpkins grew very well on this.) Same fish, same amount of commercial goldfish food every day. The only difference I can think of is the lack of any real functioning ecosystem, in the sense that until all sorts of invertebrate life colonises the new pond, there isn't anything other than the weed to supplement our feedings if the fish get peckish between meals. So maybe we'll just have to feed them more... And keep some weed growing in a separate bucket, as this goldfish afficionado suggests.

I should have looked into it more deeply, really, as it seems that goldfish adore duckweed... (Which just goes to show that data trump personal anecdote every time!)

| | Comments (4)
Share via Email Share this on Twitter Share this on Google+ Share this on Facebook

4 Comments

I wondered about this, as I used to keep a goldfish which I moved from aquarium to aquarium to eat duckweed as needed.

It really does show that I know damn-all about goldfish :) But honestly, back on the old ponds we had the same fish & heaps of floating weed (Azolla & Lemna both, & the fish never made any inroads. As I said, we quite liked it as a good source of compostable material, & indeed the 'sustainable backyard' garden at the local botanical gardens has a bathtub full of Azolla for that very purpose. So we thought we were onto a good thing!

I noticed when I went out this morning to feed them that the replacement living green carpet on the surface of the tub was looking distinctly fish-eaten, so now I have a bucket of weed sitting there for top-ups :)

The goldfish like the idea of global warming and are worried that the azolla will reverse the greenhouse effect.

Leave a comment

August 2013

Sun Mon Tue Wed Thu Fri Sat
        1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

Recent Comments

  • herr doktor bimler: Hyperlink fail. http://en.wikipedia.org/wiki/Azolla_event read more
  • herr doktor bimler: The goldfish like the idea of global warming and are read more
  • Alison Campbell: It really does show that I know damn-all about goldfish read more
  • Jim Thomerson: I wondered about this, as I used to keep a read more