Tanganjika Cichliden

Since: Jan. 1, 2003    Last update: May 5, 2024    21 years

ミクロラスボラ cf. ルベスケンス(アジアンカージナルラスボラ)

Microrasbora cf. rubescens (Asian cardinal rasbora)

ミャンマー産のコイ科小型種。ルベスケンスの近縁種で未記載でしょうか。カージナルテトラに類似の配色からこの流通名になったと思われます。購入個体の発色はもう一つでしたが、繁殖魚はかなり赤くなり青白いラインも見えます。
Possibly an unreported species related to M. rubescens and distributed in Myanmar.

Microrasbora cf. rubescens Microrasbora cf. rubescens

成長した繁殖個体。
Bred fish.

Microrasbora cf. rubescens Microrasbora cf. rubescensMicrorasbora cf. rubescens Microrasbora cf. rubescens

購入個体。
The parental fish I got.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breedingMicrorasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

成長した繁殖魚。(上)1年2ヶ月。(下)1年9ヶ月。カージナル!
The bred fish. (Upper) One year and two months. (Lower) One year and nine months. Cardinal!

ミクロラスボラ cf. ルベスケンスの繁殖

Breeding of Microrasbora cf. rubescens

繁殖は、一言で言うとゼブラダニオと同様の要領でできました。
水槽:36 x 22 x26cm
フィルター:底面、エアリフト、大磯砂
水質:特に調整なし、pH=7.4、GH=5
水温:26−27℃
照明:LED、7時間/日
水草:ミクロソリウム、ウィローモス、マツモ
2017年8月、購入直後から繁殖行動らしい動き(オスがメスを追いかける)が見られたため、1ペアを繁殖用水槽へ導入。卵は目視できませんでしたが、1週間後に親魚を取り出す。この日を0日目とします。卵は砂利の上に散撒かれたものと思われます。
In short, the breeding was similar to that of Danio rerio.
Tank size: 36 x 22 x 26 cm.
Filer: Air-lift undergravel with Oiso-sand.
Water condition: pH=7.4, GH=5. Not conditioned especially.
Temperature: 26-27℃.
Lighting: LED, 7 hours/day.
Plants: Microsorum, Java moss and hornwort.
August 2017, as the males were chasing the females just after I got the fish, I set one pair in the breeding tank. Although I could not find the eggs, I removed the parental fish to another tank after a week. This day was defined as day 0. The eggs might be laid on the gravel.

Microrasbora cf. rubescens breeding fry Microrasbora cf. rubescens breeding fry

2日目。3−4mmの胚らしきものがガラス面や水草に付着しています。
Day 2, embryos on the tank wall and water plants.

Microrasbora cf. rubescens breeding fry

4日目。稚魚が泳ぎ始めました。80匹以上はいるようです。
Day 4, more than 80 fry came out.

Microrasbora cf. rubescens breeding fry

7日目。少し成長しています。エサは、微生物が涌いていると思われるベランダの睡蓮鉢の水、稚魚用の粉末飼料をさらに指ですり潰したもの、冷凍ワムシなど。平日は朝のみです。
Day 7. I fed the fry with water of a water lily pot outside, powder food and frozen Branchionus. Only in the morning, on weekdays.

Microrasbora cf. rubescens breeding fry

8日目。Day 8.

Microrasbora cf. rubescens breeding fry

15日目。Day 15.

Microrasbora cf. rubescens breeding fry

21日目。冷凍ブラインをエサに追加。
Day 21, started feeding with frozen Artemia.

Microrasbora cf. rubescens breeding fry

28日目。Day 28.
 
 

Microrasbora cf. rubescens breeding fry

35日目。Day 35.

Microrasbora cf. rubescens breeding fry

36日目。Day 36.

Microrasbora cf. rubescens breeding fry Microrasbora cf. rubescens breeding fry Microrasbora cf. rubescens breeding fry Microrasbora cf. rubescens breeding fry

42日目。Day 48.

Microrasbora cf. rubescens breeding fry

43日目。別水槽に移動。約35匹。
Day 43, about 35 were transferred to another tank.

Microrasbora cf. rubescens breeding fry

49日目。Day 49.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

8ヶ月目。落ち着いた個体は照明によってはかなり赤く見えます。
In the eighth month, they look red under proper lighting.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breedingMicrorasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

2年5ヶ月。Two years and five months.

Microrasbora cf. rubescens breeding

2021年1月、第2世代の誕生から3年半経ってしまいましたが、3代目の稚魚を採仔できました。親魚を取り出して2日目、ガラス面に張り付いた稚魚を発見。
Although three years and a half have passsed after the birth of the second generation of fish, I tried to breed the next generation and found fry sticking on the glass of the tank two days after the parental fish were removed.

Microrasbora cf. rubescens breeding

3日目、泳ぎ始めました。方眼は1mm。
Day 3, started swimming. Grid, 1 mm.
 
 
 
 
 
 
 
 

Microrasbora cf. rubescens breeding

15日目、やはり成長は遅いようです。
Day 15. Growing slowly.

Microrasbora cf. rubescens breeding

20日目、成長には差があり、画像は遅い個体。
Day 20. The growth rates vary, and this one is slow.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

4ヶ月目、成長しています。
In the fourth month. They grew up.

Microrasbora cf. rubescens breeding

7ヶ月。Seven months.

Microrasbora cf. rubescens breeding

10ヶ月。Ten months.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

10ヶ月目、この世代は発色が悪く、バラつきがあります。
In the tenth month. Fish of this generation show pale color.

Microrasbora cf. rubescens breeding

約1年。About one year.

Microrasbora cf. rubescens breeding

1年8ヶ月。One year and eight months.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

1年10ヶ月、下のG4の繁殖を終えて親世代と同じ水槽へ移動。
Two years and ten months, after breeding the next generation (G4) below they were moved into a bigger tank where their parental fish are kept.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

2022年7月、第4世代(G4)の仔魚を採取しました。親魚を産卵水槽から取り出した翌日、既に胚が水槽壁面に付着していました。
Jul. 2022, the fourth generation (G4) of fry were born. The next day after the parental fish were removed from the breeding tank, an embryo could already be seen.

Microrasbora cf. rubescens breeding

2日。Day 2.

Microrasbora cf. rubescens breeding

2週間。Two weeks.

Microrasbora cf. rubescens breeding

7週間。Seven weeks.

Microrasbora cf. rubescens breeding

3ヶ月、産卵用水槽から育成用水槽へ移動。
Three months.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

生後1年6ヶ月。真冬には一時的に色が落ちますが、水槽移動のため掬ったところ完全に色が抜けました。
One and a half year after the birth. Usually they temporarily lose body color in the middle of winter, and when they were moved to an other tank, they lost the color completely.

Microrasbora cf. rubescens breeding

2024年1月、第5世代(G5)の仔魚を採取しました。親魚を産卵水槽から取り出してから3日目の稚魚。
Jan. 2024, fry of the fifth generation (G5) were born. Three days after the parental fish were removed from the breeding tank, I found fry.

Microrasbora cf. rubescens breeding

7日目。Seven days.
 
 
 
 
 
 

Microrasbora cf. rubescens breeding

2週間。Two weeks.

Microrasbora cf. rubescens breeding

3週間。Three weeks.

Microrasbora cf. rubescens breeding

4週間。Four weeks.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

5週間。Five weeks.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

6週間。Six weeks.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breedingMicrorasbora cf. rubescens breeding

8週間。Eight weeks.

Microrasbora cf. rubescens breeding Microrasbora cf. rubescens breeding

G5、3ヶ月。G5, three months.