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ヌマエビ(Caridina japonica DE MAN)の増殖-1 : ヌマエビの形態とその棲息地及び生態について


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Title: ヌマエビ(Caridina japonica DE MAN)の増殖-1 : ヌマエビの形態とその棲息地及び生態について
Other Titles: Multiplication of Caridina japonica De MAN―1. About the shape and the living place of Caridina japonica and their ecology
Authors: 岩本, 泰雄 / 水江, 一弘
Authors (alternative): Iwamoto, Yasuo / Mizue, Kazuhiro
Issue Date: Mar-1966
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.20, pp.29-38; 1966
Abstract: 1) We have studied about the multiplication of Cavidina japonica to be used as the living bait for angling, and the specimens were collected from Arikawa in Goto Is. of Nagasaki Prefecture. 2) Their body length is more than 5cm; they are therefore most suited for baiting hooks. In this species the female is larger than the male in general. 3) This species lives in the clear and stony stream among the mountains and exists in the little pool under the rock or in the hollow of the rock where there is no water-plant. 4) This species does not move under water in the daytime and they are active in the evening, but their action is not quick, so they could be caught. 5) The direct ray of the sun is not fit for the existence of this species and their suitable temperature is about 20℃. They are delicate to be want of oxygen, the increase of the water temperature and the turbidity of the water, and at such a time they even creep up in the air. 6) Their bait in culture is the rice-bran or the fish meal, and they eat also the soft root of water-plants and the withered leaves under the water. 7) This species spawns twice a year. And the first hatching out of the eggs is during June and early in July, and the second haching time is Septmber. The number of eggs in one spawning is 1400~1700, and about 3/4 of the eggs hatch out but the rest die. The egg of this species is very small. 8) The shape of this species is shown in Fig.1~Fig.5 and Table 1~Table 3 9) Our specimen differs from the Caridina japonica of the other regions of Japan, as it has large, clear and blue spots on the dorsal face of the end of the expodite and endopodite of the uropod. / 1)長崎県五島有川町郷之浦のヌマエビ(Caridina japonica DE MAN)を材料とし,釣りの生き餌としてその増殖を目的に研究を進めた. 2)本種は雌の方が雄よりも一般に大きく,体長が5cm以上にも達し海釣りの生き餌として真接釣り針につけるのに最適である. 3)本種は山間の水清き谷川に棲息し,水草等のない石ばかりの所で岩のくぼみや岩の下の水溜りに主として存在している. 4)本種は昼間は全く動かないが夕暮になると活動する.その動作は敏捷を欠ぐ.昼間は捕獲が容易である. 5)直射日光下は本種の生存の適地でなく,その適水温は20℃前後である.酸素不足,水温上昇,水質汚濁には弱く,この様な時には空気中にまではい出して来る. 6)飼育中の餌は米ヌカ又は魚粉が良く,又水草の根や枯れ葉も摂る. 7)本種の産卵孵化は年2回で,第一回目は6月~7月初旬,第二回目は9月一ぱい.産卵数は1,400~1,700でその約3/4が孵化し,他は死滅する.卵は極めて小さい. 8)本種の形態はFig. 1~Fig. 5, Table 1~Table 3に示した. 9)他の地方のヌマエビと異る点は尾脚(第六游泳肢)の内肢,外肢の背面先端に大きい明瞭な青色斑点が存在する(Fig. 4)事である.
URI: http://hdl.handle.net/10069/31509
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第20号

Citable URI : http://hdl.handle.net/10069/31509

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