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Archive for November, 2010

Back in August I reported my Corydoras guapore had spawned and that I was hoping for some fry. I’m happy to report that I was able to raise fry from several different spawnings. In all I have raised around 60 fry and managed to sell some at the Catfish Study Group‘s annual auction last week.

Corydoras guapore at around 6 weeks

 

Here is a short video showing some of the fry and a full account will be published on Planet Catfish in due course.

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Cyphotilapia frontosa with fry in mouth Photo ...

Cichlid with buccal cavity full of fry - Image via Wikipedia

This week’s word is buccal.

Pronounced – BUCK-ill

Meaning – relating to the cheeks or the mouth cavity.

Origin – from the latin word bucca, meaning cheek.

Example usage – mouth-brooding cichlids hold eggs in their buccal cavity.

Trivia – hamsters and chipmunks are famous for stuffing their buccal cavities with food. In humans a cosmetic surgeon can carry out buccal fat removal surgery to cure what is known as “chipmunk cheeks” in well to do women.

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Few fish are famed for their parenting skills. Most species leave their freshly hatched fry to fend for themselves, but not discus fish. Jonathan Buckley from the University of Plymouth, UK, explains that discus fish young feed on the mucus that their parents secrete over their bodies until they are big enough to forage.

Most aquarists know that young discus graze the mucus from the sides of their parents so this article will come as no surprise. Rather more interesting is the discovery of changes in the composition of the mucus produced by the parent fish.

Symphysodon aequifasciata

Image via Wikipedia

Buckley found a huge increase in the mucus’ antibody and protein levels when the parents laid their eggs, similar to the changes seen in mammalian milk around the time of birth. The protein and antibody levels remained high until the third week and returned to pre-spawning levels during the fourth week after hatching.

Much as human infants get extra protection from breast-feeding so to do young discus fish benefit from the “milk” they get from their parents. Any discus breeder will confirm that fish reared away from their parents rarely do well.

Read the full article here.

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Photo of two colour morphs of danio kyathit, s...

Danio kyathit - Image via Wikipedia

Introduction

Eighteen fish-keepers at the meeting tonight for a busy table show.

Business

John had a list of diary dates for next year. Graham Ramsay will update the website.

Topics

It was a table show and the results can be viewed here. The latest standings can be seen on the Table Show page.

Auction

Bags of 3 bristlenose catfish – £1
Bag of 2 Danio kyathit – £1
Comb-tailed Siamese fighters – £1

Next Meeting

Saturday 27th November – Trip to fish shops in the Edinburgh area. Meet at Frances and Peter’s house at 10am.

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Introduction

Eighteen fish-keepers for tonight’s meeting which was a round table and vote.

Business

A vote was held to elect next year’s Open Show Manager.

Peter Bennet proposed Graham Geddes who was seconded by Jean Symington. The vote was unanimous and Graham Geddes was duly elected Open Show Manager for 2011. We’re sure he’ll do just as fine a job as he did in 2010 and we thank him for his efforts and committment to The Society.

An Open Show Assistant is still to be chosen and should ideally be in place by early 2011.

A letter of thanks was sent to Discovery Aquatics.

A visit by Ian Fuller was proposed. This was discussed and it was felt it was a bit soon after his last visit though the day is always excellent. Perhaps a talk can be arranged from an expert on cichlids, livebearers, killifish etc?

Topics

A round table discussion on the recent shop visit to Discovery Aquatics was held. It was felt the visit was worthwhile and perhaps another take place next year.

Auction

Bags of Amazon frogbit – 50p
Bogwood with fern attached – £3 – £5

Next Meeting

18th November – Table Show No. 6

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Pregnant guppy, named Betta, in author's aquarium

Gravid female guppy

This week’s word is gravid.

Pronounced – GRAH-vid

Meaning – carrying developing young or eggs.

Origin – from the latin word gravis, meaning heavy.

Example usage – a gravid female guppy can give birth to many fry.

Trivia – gravid is usually used to refer to livebearing fishes but it can also be used to describe female fish that are full of eggs.

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Common Name: Striped limia
Location: Dominican Republic
Temperature: 72°C – 75°C
Size: Male 4cm, Female 5cm
Food: lettuce, spirulina flake, live white worms, brine shrimp various frozen food and flake

These small limias are live bearers and closely related to guppies and mollies. They are a very active fish, always on the move mid-water. They are a good community fish although they don’t have a lot of colour. As they are so closely related to guppies, mollies & other limias it’s not a good idea to keep them in the same tank as they will cross (or try to). It is however safe to put them in with platies, swordtails or any egg laying species (not that the male L. zonata seems to care who he tries to mate with).

Breeding

I have found that L. zonata have fairly small broods of fry. One of  the reasons for this could be that they will actively eat the fry unless you have supplied plenty of hiding spaces in the form of Java moss, Java fern, Indian fern, floating mops and large pebbles on the bottom. Once you see the fry I always remove the parents as this seems to give them a better start. The fry are large enough to eat fine flake, micro worm, and brine shrimp from day one. They grow quickly and by the time they are eight weeks old they are starting to sex out.

Closing note: if you notice that you have males in the tank, any females will probably be gravid

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