 | of Cybister japonicus |
| I think that the names of insects almost made a poor out, but not this [Gengorou]. It's amazing name. Who in the world named them? They are amazing. |
| It is said that there are some legends in the origin named [Gengorou]. Though I'd forgot about... What was said? Well... [Gengorou-zamurai (A warrior of the diving beetle which is not only insect's name but also person's one. Was that?)] fell from clouds or so? Do you have the origin which was named them in your countries? |
| They were often sold at some shops when I was young, but now I hardly catch them in selling. I took many years until I actually get them since I began to wish that I want. |
| Even now, I don't forget the thing which is my first got it by my own on the habitat. Since there was where I strongly doubt that they must have been before many years, I was very as glad as said ah, uh or something. |
| But how long can there last out? The wave of development is eaten away at all places. slowly but surely. |
| Now, there are also much people who have never seen and even heard Gengorou. Are they calmly getting to be away from our memory and life into poor gloomy darkness like an old well as [Toukurou( Old nickname of the silver beetles.)] had forgotten by us? |
| Why does the insect live in water? What factor made them live in water? What was going on? When did they get themselves adapt underwater? My imaginations are not gone if I began to think. Anyway, their figures caught in water are very beautiful beyond all expectation. |
| It rests the body on land. In fact whether or not, they are OK at land, sky and underwater anywhere. Did God give them all round? Didn't that be as much... |
| Male has the clasper like a trident lancer. The both of organ holds the side of male's clasper and the center of organ has a match. |
| Now matching. They are getting there. It seems fit in copletely. The great system of nature. |
| Female has vomited in the cause of mating by force just after eating. Did she have pressed the belly pressed by sperms? Male is so selfish. Ofcourse this male is fine now. |
| The photo is in the tank of the outside for winter hardening at night. Stealthily. Slowly. Although their activities have lost in the October end of 15 degrees water temperature, they often still swim and have some appetite. It will be some time before the dead of winter comes. |
| An old Cybister japonicus. Perhaps it was 3 or 4 years old. Though it passed many winter, it was still in good spirits. Toward 4th year. |
| There are cases in which they can live in 4 or 5 years. Unless breeding in particular. |
| By the way, there are two kinds of eyes type which seems a simple eye and compund eye in larvae of the water beetles( Dytiscoidea ). Moreover, there are two kinds of respiratory organ which are straight and divergent in them. Cybister japonicus is like this. |
| They pour digestive juices into a bait when they baited. And they sip at its body fluid. there are the person which had blown the finger by the larva and operated at a hospital, as I heard. So be careful for not to get injured when you treat the larva. |
| This is the larva which is transforming itself into 3rd stage from 2nd stage. It's a ecdysis. It finishes with a mere instant. Probably, Larva has not spent many hours, since defenseless in the meantime. |
| I have landed the larva of 3rd stage on the way to grow up by my mistake. I thought how then? since it doesn't go into moss at all. And then 20days passed. It might be hungry very very much. The larva which returned into water ate the head off. the great deal of. I was sorry for it even now ( Afterwards, it emerged without any problems ). |
| It hatches out from an egg, does ecdysis twice, becomes approximatly 8cm and lands at last. It's not why the larva becomes a pupa under water, right? |
| It seems that it usually emerges about 20 days after going into the ground. Although there was a time that the water beetle had used for food, I may also eat if it is just a pupa. fat and juicy? Oh, but I'll never eat if it so. |
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This following data is three of them who succeeded in emergence for the first time in 2001. |
| This is a teneral female which hatched only one in 2002. I think that The hibernated condition might be not better this time. I got only this one. It hatched on June 6 and emerged on July 26. It took 50 days to emerged. 1st stage larva ate only MIZUMUSHI. 2nd ate MIZUMUSHI, some killifishes, a YAGO and few rare bloodworms. 3rd ate killifishes, goldfishes and few rare bloodworms. I was very glad when only one got emerged without any accident. |
| 28 Cybister japonicus emerged out of 30 hatched in the breeding season at '03. Welcome so much. A sex account is 16 males and 12 females. I have the growth record on this site, but I'm sorry that it's only in Japanese now. |
| C. japonicus and C. brevis are eating died L. deyrolli of 5th instar. |
| Cybister japonicus with Water hyacinth. |