Fishroom Fysics

"Physics" might have been a difficult subject in high school or college. Why do we need this in the fish-keeping? This is using the natural laws of physics to work for you. Yes, work for you - do some tasks for you. Since fishes live in water, these physics-related tips would revolve around water - specifically, water change. Here are four 'concepts' that I find most useful:
1. Gravity. Things from up have to go down.
2. Balanced level. Water balances out to one level. Higher "levels" of water will flow to lower "levels" of water until both sides have the same level.
3. Sealed systems. In a sealed system, water will continuously flow as it becomes one mass.
4. Density. It is easier to suck up air (light things) than water (heavy things). If air gets in your system, it is no longer sealed and flowing stops.
All of them are connected so it is beneficial to see how they work together. The first three concepts are essential in making water flow. The last one is important as a fail-safe. For example, if you forget you were draining a tank, not all of the water will be sucked away and your fish will survive. The following images are simple designs that uses these concepts.

My contraption of hoses, switches and Y-joints. These help create a long sealed system and allow water to travel from one end of the fishroom to the other.

The high end draining water from aquarium. Gravity dictates that things from higher places goes down.

The low end flushing water to a pond. The water level (at the end of the hose) will never reach a balanced level with the water where it's draining from. Thus, water continuously flows.

Overflow with net so fish don't escape.

A smaller example. Water drains from a fry tank to a bucket using an air hose.

The draining end uses an airstone to prevent sucking in fry. The airstone has holes all around. The higher holes will suck air and thus un-seal the system and not all the water will be drained.

The draining end.

The filling end. Gravity, Balanced Level and Sealed Systems.

Rubber strips are useful for wrapping and sealing leaks.

I hope you get some ideas about using physics in your fishroom. There are other applications that I have not explored or discovered yet because what you might need may be different from what I need. Apply your ideas to what you find most useful.

Happy Fish Keeping!
EESDA

EESDA Guppy Breeding

Guppies are live-bearing fish and are one of the easiest fish to breed. Because of their ease, their population can easily boom. Here are just the methods I use in breeding my guppies. Males and females are easily told apart. Males are more colorful. They also have smaller bodies and bigger fins. The females have bigger bodies, shorter fins and duller than the males. The females also have a more rounded body compared to the males.

1. Prepare a trio or a quad of guppy breeders. Male to female ratio is 1:2 or 1:3. Just place them in a tank with plants for fry's hiding places. Take care of them as you would as other fish and wait for them to give birth. Female guppies can give birth 6 times using the sperm from one mating.

2. When the fry are born, I do not remove them unless they are being eaten. If plant cover is sufficient, eating will not be a problem. I give the fry baby brine shrimp at first but they are also big enough to be given daphnia.

3. When I can discern the males from the females, I remove only a handful of females (6-10pcs). You can also choose to remove all of them but it is not necessary. This is important to keep them virgin so they will be flexible for future use because you know which male mated with them. You can identify females by the black spot at the back of their bellies. The pointed anal fin of the male (or the gonopodium) is not yet developed so anal fin shape will not be an effective tool.

4. Raise the main spawn group and selected females separately. When they reach about half an inch long, adult food can be given. No need to crush the food. The water will soften those up for the fry.

5. When you see your potential breeders, separate them and prepare for another generation.

The challenge with guppies is that they can easily boom. So be prepared with what to do with your excess fish. Well, you can sell them if you have enough space to raise a lot of fry to sell. If not, you can also opt to use them as feeders to carnivorous fish or turtles.

UPDATE (11/04/2013)
Here are some tips!

1. Choose a fry tank that is not too wide. Position it so you that you face the "short breadth" of the tank.
2. When your guppies give birth, catch all fry and move them to the fry tank. Grow them out together.
3. Every time you feed look for males. Catch them and transfer them to another tank. I put my juvenile males along with the adult males in the community tank.
4. You can now choose your potential breeders!

Good luck on your guppy breeding!

EESDA Betta Breeding

To start off, I think I should identify with sexing bettas. Some might think that plakat (short fin) males are females. To prevent you from putting two males together and end up with massacre, I am going to give some tips to identify if your "female" is really a she.
1. ovipositor: this is a small salt-looking organ behind her belly, before the anal fin. Be warned though because some chubby males have a similar looking thing on some occasions.
2. triangular belly: the belly of a female is more of a triangular swelling compared to a stuffed male's round belly. Looking from above, the female is wider and still has a triangular outline. If you look at a male from above, the belly is circular and round while the rest of the body is streamlined.
3. generally short fins: female bettas have short fins, even shorter than plakat males. However, I have seen long-finned females lately.


Now, here are simple steps I do to breed my bettas:

1. Prepare a barebottomed 2.5gal tank*. Place a few live plants and a piece of styrofoam for a bubblenest anchor.

*I have spawned in bigger tanks (10gal+) and with a fine substrate but not quite as fine as sand.

Here are more common set-ups.

2. Add the conditioned male and female. Some would use a chimney to separate the pair first but I have long stopped using those. Just let them be together.

3. Wait. Check the pair occasionally to make sure that none get too hurt. Although the wife-beating is part of betta love, there is a point where a female betta is too abused. The breeder must use his personal discretion.

4. After 2 days to a week, the bettas would have spawned already. The spawning process involves the female approaching the male's bubblenest in a bowing, submissive way. The male tries to flip the female and wrap his body around her. The female will release her eggs and the male will fertilize them.
At this point, you will have eggs. Betta eggs look like small pieces of salt hanging on the bubblenest. Remove the female. The male will kill her if you don't. Trust me. I tried.

5. Wait. After 24-48 hours, the eggs would have hatched and you will have fry hanging vertically. Just let them be. Wait again.

6. 2-3 days from hatching, the fry will be free swimming. You can remove the male at this point or opt to keep him with the fry as this method in these links:
http://www.bettysplendens.com/articles/page.imp?articleid=809
http://www.bettysplendens.com/articles/page.imp?articleid=839

7. If you opt to remove the male, use a coarse net to avoid taking any fry. When you catch the male, do not remove him immediately. Just dangle the net in the spawning tank for around 10 minutes. This will allow the male to spit out any fry in his mouth.


So there you have it. Betta breeding is easy. It might be tricky at the start but when you get the hang of it, it will be a breeze. Good luck on your spawns!

UPDATE (11/04/2013):
What I forgot to add in this post are tips!

1. Aggressive breeder = more volume, example: add water to a half-filled tank
2. "Too Battered" breeder = depends on you...if you think they will spawn, add more water; but if you think otherwise, scratch the pair
3. "Not Aggressive Enough" breeder = less volume, example: drain water to half level
4. Short-finned male = more volume
5. Long-finned male = less volume
6. Female is larger than male = more volume
7. Male is much larger than female = more volume
8. No bubblenest = normally, I let the pair be...this type of male builds a small one after he squeezes the female; but other times, I scratch the pair
9. Female is not moving anymore = separate the female, out of other fish's sight...if she swims fine/properly/upright, put her back in; but if she doesn't, scratch the pair
10. Judgement and gut feel and intuition = breeders develop some kind of instinct as they breed more fish; trust your self!