Ginbuna: Carassius langsdorfii

Carassius langsdorfii (Ginbuna)

Carassius langsdorfii is a fresh water fish which grows to about 30 centimeters in 4 to 5 years. Carassius langsdorfii belongs Carassius, Carassius of Cyprinidae, it is belongs Cypriniformes, Cypriniformes of Osteichthyes. Almost all Japanese people called them “Ginbuna”, few people call them “mabuna”. Carassius langsdorfii total length is 15 to 30 centimeters. Carassius rangsdorfii’s body get narrow at back of starting buttock fin. “fubunkinanjo” is 4 , “bunkinanjo” is 15 to 18 at dorsal fin. “fubunkinanjo” is 3, “bunkinanjo” is 5 at buttock fin.

Carassius langsdorfii usually grows in Japanese river where flow is mild. Carassius langsdorfii live in ponds and lower of rivers. Carassius langsdorfii is omnivorous fish, for example they eat zoo plankton adhesion seaweed and water animals that live in bottom. The other,

Carassius langsdorfii eats killifish.

Breeding or spawning on be water-weed in spring. But Carassius langdorfii’s reproduction is divided two types, one is asexual reproduction the other is sexual reproduction. Carassius langsdofii is mostly female. It is a kind of asexual reproduction. First, female Carassius langsdorfii produce her coulomb. Afterward, coulomb grows up and goes through this reproduction. But, Carassius langsdorfii’s sexual reproduction is special too. First, female Carassius langsdorfii

blows egg. Then, male Carassius spray sperm. For example, Carassius buergeri subsp called “kinbuna”, Carassius auratus subsp< called “nagabuna” and Carassius buergeri grandoculis called “nigorobuna”are included in Carassius. Afterward, Carassius langdorfii’s female flies are born and grow up. When do Carassius langdorfii

Carassius langsdorfii are used in cultivation with carp in reservoirs and a follow fields in Ueta-city, Toumi city and Saku-city in Nagano. Lately, Carassius langsdorfii are not used for food too. But, at present, Carassius langsdorfii are used for food in Hachirougata-town in Akita. Carassius langsdorfii’s source is Tone-river in Chiba, Biwa-lake in Shiga and so on. Main recipe is roastsd fish sprinkled with salt, “kanro-ni”, soup and sashimi. But, it must not be eaten as is saw, because Carassius langsdorfii is Intermediate host of Gnathostoma spinigerum. There are local specialties called “funamiso” in Aichi and Gifu. Besides, there are local specialties called “funameshi” in Okayama. Carassius langsdorfii is plain taste. Besides, local specialties called “teppai” in Kagawa. Carassius langsdorfii

is a popular fish for sport fishermen.

Carassius langsdorfii is a very interesting fish because, Carassius langsdorfii is almost all female. We can see Carassius langsdorfii at Kitagawa-town, Ino-town, Kahoku-town, Noichi-town in Kochi. We can see Carassius langsdorfii at kochi in October for April. Asexual reproduction occurs almost exclusively in single-celled organism, but Carassius langsdorfii is one of the creatures that do asexual reploduction. What’s more, Carassius langsdorfii do sexual reproduction too. It is wonderful. Carassius langsdorfii are eaten various regions.

Carassius rangsdorfii are loved in various region in Japan. Carassius langsdorfii do asexual reproduction. But there are one problem that problem is speciation. Asexual reproduction equal no-change fly’s character. So Crassius langsdorfii can’t manage for change of nature. It is disadvantage at reflection of species. It’s interesting to see Carassius langsdorfii.

Ayu: Plecoglossus altivelis altivelis

In summer, if you go to upper reaches of a river, you may see many anglers who have very long fishing rods. Probably, they are Ayu fishing. Ayu is famous in Japan. Most Japanese know Ayu live clean rivers at least.

Ayu have many relations. First, we eat Ayu. For esample, Sioyaki, Tempura, Segosi, Sabazusi and Uruka. But Ayu may have parasitic which are called Yokogawakyuutyuu. So if you eat Ayu, you should not eat it raw. In addition to this, it is Ayu fishing. There are caught by decoy and fry-fishing. But there are closed season for fishing from May to November and we must buy license fishing. And goods are very expensive.

Ayu’s scientific name is Plecoglossus altivelis altivelis. They belong to Osmeriformes like smelt and Japanese smelt. They are related to koukakugyorui.

Ayu fry live in sea and downriver. They eat plankton and insect which live or fall in the water. They hatch from two weeks and they are clear in body so we can their beating heart and air bladder. When they become ten millimeters, they begin to be fragrant like watermelon or Oriental melon. On April and May, they get color and the teeth become like spit. And they go up river.

Adult Ayu live in middle and upper reaches of rivers and eat algae. They are gray and green. Young Ayu swim together but bigger Ayu make territory in places where there are many diatom. This territory is one meter in every direction and if others enter the territory, they deliver an attack by bodily impact. In fall, they become orange and black. It is nuptial coloration. From February to September they swim down river. Then they lay eggs in shallows where there are many pebble stones and sand in group and die. So they end their lifetimes in one year.

Much Ayu live in Kochi rivers because Kochi’s river are clean. Rivers which Ayu live in Kochi are Shimanto River, Yoshino River, Niyodo River, Monobe River and Kagami River. So if you are interested in Ayu, go to the upper reaches of a river and fish Ayu.

Ayu have a relation with people from old times. But wild Ayu are decreasing by people impact. Ayu cannot live in muddy rivers because algae cannot photosynthesize in muddy rivers. Releasing Ayu into the river is done in Japan. It is good thing. But I don’t like this because it may mix alien species and origin. So I think we must keep clean river. If wild Ayu are not seen river, it is very lonely.