ago, and it will not go away. I have been losing a few fish each
week. I started with 24 of them, and now I am down to 12. Nothing
seems to work.
The chili rasbora (Boraras brigittae) is a pretty little
cyprinid that works very well in a nano aquarium. A three-year-old chili rasbora is very old for a small fish, though,
and the problems your fish are having are probably due in
part to their immune systems becoming weaker. There is nothing that
you can do to prevent the effects of fish aging.
The more concerning issue is that ich is completing its life cycle in the
aquarium even though you are treating it. Ich, or white spot disease, is
caused by a protozoan parasite with a life cycle that includes time in
the fish, the substrate, and open water. The only phase of the parasite’s
life cycle that is susceptible to medication is the free-swimming form
in the open water, so medication needs to stay in the aquarium long
enough for all of the parasites to enter that phase and then be killed by
the medication. When treating for ich, it is important to maintain the
correct concentration of medication in the water until all the spots are
off the fish for several days.
I bought a pair of gold australe killifish at a club
auction a few months ago and want to raise some up
from fry. They spawn two times each week but only
two or three eggs at a time. I remove the eggs from the spawning
mop and put them in a dish of clean water.
The eggs develop and hatch, but the problem is that they do not
hatch all at the same time. So I end up with some fry that are larger
than the others, and the large fry eat the new hatchlings.
I do not have tank space to raise two or three fry at a time. How
can I get this female to lay more eggs at once?
The gold australe killifish is an orange and red tank strain
of Aphyosemion australe, which is found in west-central
Africa from Gabon south to Angola. The red variety is well
established in the hobby and is considered an easy killifish
to keep and breed.
Pairs will lay their eggs in a spawning mop of yarn, and an adult
female in good condition with plenty of high-protein and high-fat food
can produce a dozen or more eggs in a week. Try offering the pair foods
that are higher in protein and fat, such as live worms, daphnia, and
baby brine shrimp, and make those foods available every day. Females
that look fat will produce more eggs.
Another strategy that works with most mop-spawning killifish,
including the gold australe, is to force the eggs to suspend development
for a few days by placing them on a damp substrate to incubate. Instead
of placing the collected eggs into water, set them on damp peat moss or
coconut coir pressed into a shallow dish. The eggs will develop normally
but will not hatch until they are covered with water.
If the female killie is only laying a few eggs each week, you can
accumulate the eggs from all of the spawns for two weeks, let them sit
on damp substrate until all of the eggs have developed (usually ten days
after the last eggs are collected), and then trigger them all to hatch at
one time by covering them with water. D
Tropical Fish Hobbyist