[Special feature] "Let's observe familiar creatures" I do not live only in the 8 -Sawa.Surprisingly familiar crabs
This is the 8th special corner where people in the shit, crabs, hermit crabs, salamander, newmori, frogs, and other people in the Unchiki Wiki "Decapedia" extracted familiar creatures.Now that you are reluctant to move due to the expansion of the new colon virus infection, you may not be able to go to the sea or the mountains, but I think that stress is accumulated, but in Japan, Japan will be canceled.This time, I will introduce the most famous crab "Geothelphusa dehaani".
You may have an image that you can step into the Fukayama Yutani and have an image that you can only see unless you go to a beautiful mountain stream, but it can also be seen in a small stream along the waterway of the village rice fields and the mountain road.
サワガニは青森から屋久島にかけて分布※1※2する我国の固有種です。最もよく知られたカニと言えますが、実は発生段階を含め一生を淡水で終える純淡水性のカニは、カニの中では特異な存在※3です。他のカニに比べると行動範囲が狭く、そのため地域個体の固定度が非常に高く、棲息地域によって様々な色や形態的な多様性を持っています。
As the name suggests, it is often seen in the mountains in the mountains, but it is also common in the ridge of satoyama rice fields.In winter, holes are often digged in the ridge and hibernation is often hibernated, and the period between the child -jaris and the sub -fabric lives under the shoring of the swamp, but when it comes to large adults, land -lived trends become stronger.It does not leave the water like a red -like crab, but it may move to a fairly wide range to the track.
都心から少し離れたところだと、住宅街の外れのちょっとした水路でも見られることがあります。Especially on rainy days, you often walk away from the swamp, and if you take a walk in a little mountain after the rain, you may meet in a surprising place.
Sawagani and Chiromantes Dehaani have a deep relationship with Japan's rice culture (because of that, because the specimens are easy to collect), they classify crustaceans based on specimens and figures brought back from Japan.The name of Wilhem de Haan of the Leiden Museum is dedicated to the scientific name.
BOD※4の低い水に棲む生き物であるため環境指標動物として有名です。
* 1: It is said that it is not distributed in Hokkaido, and what is discovered in recent years seems to be human transfer, so it is removed from the distribution.There is also an objection to the recent discovery report in Hokkaido.
* 2: Nakanoshima of the Tokara archipelago was the southern limit of all crabs, but the ones born in Nakanoshima and Kenjima may be new or not listed.
* 3: Even if you are a completely land -lived chicken that lives in mokuzugani, known as river crabs, river crabs, etc., who are known as river crabs, the crabs that are known as river crabs, go down to the sea, not fried crabs.Publish.Zeea grows in the sea.
* 4: Biochemical Oxygen Demand = biological oxygen requirements = oxygen requirements required for bacteria to decompose dirt.The higher this value, the more water pollution is progressing.
節足動物門 > 甲殻亜門 > 軟甲綱（エビ綱）> 真軟甲亜綱 > ホンエビ上目 > 十脚目（エビ目）> 抱卵亜目（エビ亜目）> 短尾下目（カニ下目） > サワガニ上科 > サワガニ科 > サワガニ属
It is a crab that you often see in a pet shop, but for urban residents, if you go a little (a few tens of minutes on a car), you can see it by collecting it if you keep it.is.If you miss any horse bones to a nearby river, you should be strictly discontinued because the species that have been inherited for thousands of years (regional fixed) will disappear in an instant.
Regarding the breeding method, it is easy to think that it is easy to keep for a while even in an environment with gravel on a bucket, but because it prefers a slightly higher clean low temperature, the difficulty of long -term breeding is high.is.It can be easily kept from autumn to early summer, but it quickly weakens in an environment that exceeds 30 ° C in summer.Because it is a master of escape, breeding cases such as aquariums require a lid that closes perfectly, so the breathability is poor, so in the summer, the water temperature often increases and dies.If there is some cooling device, such as a type of aquarium that can exhaust heat outside the room, long -term breeding will be easier.
In the case of the writer, in the summer, the electricity bill is kept on the cooler in the room.
アイリスオーヤマ 飼育ランド ブラック 3Lposted with amachazl at 2020.04.08アイリスオーヤマ売り上げランキング: 3,440で詳細を見るSince there is less danger of co -eating compared to other crabs, it is possible to have a large breeding case and a sufficient hidden house (and landing), but it can be mixed up immediately after dolaking and is killed by other individuals.Since the gender is not 0, the number of breeding is appropriate for a male, 4 or 5 female, in a water tank of about 90 cm.Lay gravel on the bottom and combine many driftwood and stones.Planting moss in driftwood is particularly interesting because the atmosphere comes out, but since lighting is required (lighting such as fluorescent lights is a heat source, and it becomes a sealed state), it will be severe without a cooler.
Emours 自然流木 水族館シンクエイブル流木水槽の装飾 中posted with amachazl at 2020.04.08Emours売り上げランキング: 10,920で詳細を見るSpeaking of crabs, when you go to the Yamano by picnics or camping in a family, you may say that your child wants to take it home because you are a kid -style play partner.
In that case, even if you do not use a particularly large breeding equipment, you can breed in a plastic case if you are alone or one male and female.Rather than using a filtration device, it is easier to maintain the water quality by frequent water change, and the case can be carried by hand, so in the summer, it moves to a cool place in the shade, so it is water temperature management.It will also be easier.
・ Use a medium size plastic case.(About ¥ 1,000)
・ Because you are a master of escape, you will always choose the lid that closes.However, avoid those with few air holes as they get stuffy in summer.
・ Avoid the lighting device as it is a heat source.
・水換え前提の飼育環境なので、濾過装置は必要ありません。むしろこの状態では生物に有害な亜硝酸塩、硝酸塩発生装置※5にしかなりません。水流を作る目的での小型の水中ポンプやエアポンプは有効ですが、コードを伝っての脱走や夏場の水温上昇に注意が必要です。
・ Lay the bottom sand for about 2cm.Sesame grain size is appropriate.Oiso sand, ceramic sandwich for tropical fish, river sand, coral sand, but insect mat is NG.
・ Create land part with stones and driftwood as a hideaway and emergency evacuation site.
・ Put the water up to about 5 cm.If you want to use tap water without a water purifier, use a pumped one day.
・ The bait is placed for 1-2 days.Summer and winter are about once a week.Give a small amount of commercially available crayfish bait and krill.
水槽の蓋を開けると驚いて逃げ回るのですが、ピンセットでクリルを持っていくと鉗脚で掴んでおとなしく食べます。・ Water depends on the season, but change every few days.
① Move stones and driftwood to another container.The crab is OK as it is.
(2) The water that has been pumped about the same amount as the water in the breeding container is quietly added to the case as it is, and scooped up with a plastic feces, leftovers, and a half -cut plastic bottle.Put it until it becomes.
③ Avoid changing water immediately after molting, and leave for 24 hours or more from the completion of molting.
・ In the summer, it will die when the water temperature rises, so put it in a cool place and avoid direct sunlight.If you put water in a cold pack or a plastic bottle, put frozen, etc. on the case and keep it cooled, the crab will not weaken.
・ In spring and autumn, there is no need for cooling treatment, especially if you avoid direct sunlight.
・ In winter, if it is indoors, you do not need to prepare a hibernation environment, especially.It is difficult to overwinter outdoors, so I will not mention it here.
If you have been raised for more than a year in this state, you may probably be troublesome to take care of your daily life, especially your children, but that's not the case.It's a pity that care will be neglected and the creatures will die, but I think they will be much better than growing up without any interest in creatures.
However, if you make a mistake, say, "It seems cute to die" and do not release it outdoors.Seeds that have been fixed as regional individuals for thousands of years should not be extinct for their selfish self -satisfaction.
* 5: If the filtration device has high physical filtration capacity and the biological filtration capacity is relatively low, the remaining bait and living feces of the filter material are always the source of ammonia and the nitrite concentration does not decrease.Also, even if the biological filtration ability is high, the nitrate concentration does not decrease even if the water is changed or changed.The filtration device that can be used in this kind of small breeding case is often used as a sponge or wool, and it is often the case that nitrite and nitrate generators are often used.The necessary bacteria will be killed, so it will take some time to start up as a biological filtration device.
Under the natural nature, male and females mate underwater from early spring to early summer, but in the breeding, it does not matter much in the season, and because the movement is slow, the male mainly caught the female after the molt, and the stomach together.I will mate to hug each other.This is a problem in a narrow breeding environment with a small hideout, and the females often die during the mating.Even if you succeed in mating safely, the male can even kill a slow -moving female.
In addition, in the case of a female crab that is not enough to be sexually mature, it may be re -molted again after mating, whether it is in order to lower the falling egg rate, and in addition to two molt in a short period of time, the exhaustion of physical strength in mating.Then, almost 100%molting and dying.
If the mating is successful, the female will land and lay eggs on their belly (commonly known as the fluff, actually inside the tail) in a wet and dark place on land.Eggs are large egg -shaped, unlike other crabs, and they are born in a child crab, not Zoair at the time of hatching.When the child hatches, the female returns to the underwater life again, hugging the fried crab under the gentle conversion stones of the water flow, and emits a fairly large.For this reason, if the mating is completed safely, and then isolated from the interference of other individuals, it can generate a fried crab relatively easier than other crabs.
However, child crab is particularly weak in water quality and deterioration than parent crab, and is also weak in high water temperature, and it is difficult to grow it into crabs.
To breed stably
・ Securing a sufficiently mature male and female
・ Care to prevent females from being killed by male before and after the mating
・ After the mating, the females gradually land into land, so preparing for a wide land part for that.
・ Installing multiple hidden places on the land
・ Developing an environment where the females in the eggs are not attacked by other individuals
・ For long -term maintenance of stable water quality at low temperatures for child crab after hatching
But it is necessary.
Female in the eggs often see individuals holding fried crabs while dropping the forceodes and legs in the natural, probably because they are hard to move and cannot play molt.In breeding, it is difficult to survive safely in an environment where there are few foreign enemies, but there are many crabs living together or there are few hideaway.In addition, child crab immediately after hatching is only a good food for crabs, so it is necessary to have sufficient care and environment.
・ Normal breeding environment
・ Breeding environment for mating
・ Breeding environment for spawning
・ Breeding environment for incubation
・ Breeding environment for child crab
If you prepare the above five types of breeding equipment, you will be able to breed under breeding.
RE型のサワガニサワガニの体色は、稚ガニの時はいずれも茶色っぽい色ですが、性成熟後には大きく分けて3型、橙褐色の甲に橙色の脚を持つRE型（Red）、全体的に褐色～暗紫色のDA型（Dark）、青い甲に白い脚を持つBL型（Blue）に分類されます※6。
It has various traits depending on the swamp that flows in the same mountain, but the BL type seems to be often seen in the waters of some water in the southern Kanto region, Shizuoka, Shikoku, and Kyushu.In particular, most of the crabs in the southern Kanto (Boso, Sagami) are this BL type, and the red one is more rare (in Boso, blue crabs are called simmered crabs).
BL型のサワガニDA型？Because the ones that are distributed in edible or what you see in the pets distribution of the secondary route (because it looks delicious?), There is an image of crabs as an orange crab.The BL type is rarely seen in Kansai and other places, so there are some misunderstandings that "blue crab = rare", but this is not a color variation that occurs with a rare probability, and the bait that does not contain carotene.It is not an acquired blue body color that continues to give.If you go to the water area where blue crab lives, you will be crap.In Kanagawa and Chiba, some people have never seen the RE type.
* 6: Each type of Re, Da, BL, etc. in each region is not particularly genetic connection, but simply categorized by appearance differences.The reason why it becomes such a color type is probably related to the terrain and soil color, but it is unknown.The color -changing individuals that happened to be expressed tens of thousands of years ago survived by foreign enemies from the surrounding environment.In other words, it is normal to think that it was adapted.
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[Special feature] "Let's observe familiar creatures" Part 6 -Acate crab that appears near the coast from around the dawn of GW
[Special feature] "Let's observe familiar creatures" Part 5 -Male may be ringing after the breeding season!? Moria Ogael
[Special feature] "Let's observe familiar creatures" Part 4 -Yama Akagaga frog is about to be a tadpole.
[Special feature] "Let's observe familiar creatures" Part 3 -The clamming season is coming soon!Mass -produced sandbags with tidal flats
[Special feature] "Let's observe familiar creatures" Part 2 -The clamming season is coming soon!Yamato Sagani has a considerable number of mud.
[Special feature] "Let's observe familiar creatures" Part 1 -The clamming season is coming soon!Mamede cobb crabs often seen in clamming.(With simple breeding method)