養殖ウナギの鰓に寄生するPseudodactylogyrus microrchis(単生目)-1-寄生数の季節的変化
スポンサーリンク
概要
- 論文の詳細を見る
In 1969, a considerable amount of elvers of the European eel (Anguilla anguilla) began to be imported mainly from France and cultured in various districts of Japan, Since then, pseudodactylogyroses have occurred in eels, especially in the European eels, cultured in many farms. Pseudodactylogyrus bini, P. anguillae and a new species. P. microrchis, were reported as the causative agents of the pseudodactylogyroses by OGAWA and EGUSA (1976), but on the biology and ecology of these dactylogyrids little has been studied. Since 1974, the present authors have been studying the biology and ecology of P. microrchis. In this paper we dealt with the seasonal changes in abundance of this species in an experimental pond at Hiroshima University and two eel farm ponds in Tokushima Prefecture. The results obtained are as follows: (1) P. microrchis was observed on the gills of the European eels cultured in those three ponds. Besides, P. bini was observed in the experimental pond. (2) It was found that the size of the testis and the size ratio of the testis to the ovary cannot always be used as the discriminating character of P. microrchis from P. anguillae. (3) An apparent seasonal change in abundance of P. microrchis was observed in every pond, that is, the number of parasites became most abundant in August, September or October. (4) From the fact that the each parasite population attained its peak in the above mentioned season after high water temperature period (26°C-30°C), the abundance of this species is thought to closely depend on the water temperature.
- 日本水産學會の論文
著者
関連論文
- 芦田川河口域に発生したアカメの潰瘍病
- ウナギの赤点病
- 養殖ニジマスのビブリオ病の一原因菌―II : 生理学的性状および病原性
- 養殖ウナギの赤点病に関する研究―IV : 原因菌Pseudomonas anguillisepticaの生理学的特性
- 養殖ハマチから分離されたVibrio anguillarum
- アユから分離されたVibriostatic agent非感受性のVibrio angutllarum
- アユのビブリオ病に関する研究―I. : Vibrio anguillarumの病原性
- アカメに寄生していた橈脚類,Caligus orientalis
- 養殖ゴイにおけるDactylogyrus extensus及びD.minutusの寄生率の季節的変化
- 養殖ゴイに寄生していた単世代吸虫Dactylogyrus extensus
- 養殖ウナギの赤点病に関する研究―II : 原因菌 Pseudomonas anguilliseptica の病原性について
- アユ病魚より分離されたnon-cholera vibrio〔英文〕
- 養殖ウナギから分離された病原性Vibrio-3-塩分耐性および鞭毛形態
- Fish-pathogenic bacteria isolated from diseased Ayu, eel and carp cultured in ponds in Aichi Prefecture
- Studies on red spot disease of pond-cultured eels—I:The occurrence of the disease in eel culture ponds in Tokushima prefecture in 1972
- 養殖ウナギの鰓に寄生するPseudodactylogyrus microrchis(単生目)-2-産卵,孵化及び宿主上での発育
- 養殖ウナギの鰓に寄生するPseudodactylogyrus microrchis(単生目)-1-寄生数の季節的変化
- Characteristics of the causative agent of vibrio-infection prevailed from spring to summer in 1973 among cultured Ayu in Tokushima and Okayama
- 養殖ウナギの赤点病に関する研究-5-原因菌に対するニホンウナギの免疫応答〔英文〕
- Studies on Red Spot Disease of Pond Cultured Eels—III:A Case of the Disease in the European Eels (Anguilla anguilla) Cultured in Tokushima Prefecture
- Pathogenic Vibrio Isolated from Cultured Eels—II:Physiological Characteristics and Pathogenicity
- Vibrio anguillarum isolated from eels cultured in freshwater ponds
- An abnormality in the joint of elvers