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共生橈脚類Ostrincola koeのアサリ殻中に於ける生殖および変態について(予報)


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Title: 共生橈脚類Ostrincola koeのアサリ殻中に於ける生殖および変態について(予報)
Other Titles: On the Reproduction and Metamorphosis of a Commensal Copepod, Ostrincola koe, in the Japanese Clam, Tapes japonica (Preliminary note)
Authors: 高, 良夫
Authors (alternative): Ko, Yoshio
Issue Date: Aug-1969
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.27, pp.1-7; 1969
Abstract: Ostrincola koe, a commensal copepod species, has seven pelecypod species as its host such as the Japanese clam, Tapes japonica. Among four commensal copepod species living in T. japonica, Ostrincola koe is found most frequently in that hosts1)2). The nauplii of this species leave the hosts immediately after hatching and spend the free-living stages in the sea water, re-entering clams at the first copepodid stage. All of the copepodid stage larvae, however, subsist in the mantle cavity of the hosts, molting periodically and finally reaching the sixth copepodid stage (the adult stage). This ecological study was accomplished by rearing the nauplii or ovigerous females in dishes with 80 ml to 100 ml of filtered sea water and then by placing the copepodids in beakers with 1 ltr of filtered sea water using in each beaker an individual of T. japonica as host. In the latter cases, the hosts and the sea water were replaced daily after the observations of these copepodids. On the basis of the results of these rearing experiments, it may be concluded as follows: 1. Mating takes place a few days after the adult stage is attained. 2. Each individual of the females ovulates at least 2-3 times. 3. The incubation period at water temperatures approximately 28℃ and 23℃ is 1-2 days and 2-3 days respectively (Tables 1 and 2). 4. In most cases, all of the eggs in a pair of ovisacs can hatch. 5. The survival rate of nauplius stage larvae is low, probably below 50 percent (Table 3). 6. Males and females will take approximately 11-12* days and 17-18* days respectively to grow from first copepodid to adult at water temperature about 25-26℃ (Table 5). / 二枚貝類殻中に共生する橈脚類Ostrincola koeの成体およびコペポディットを,アサリを宿主として用いて飼育し,その生殖生態および変態過程を観察し下記のように推定した. 1. 交尾は雌雄ともに成体となって後,数日中に行われる. 2. 雌は2~3回以上産卵を行う. 3. 抱卵期間は28℃前後で1~2日,23℃前後で2~3日である. 4. 卵の孵化率は高く100%に近い. 5. 卵よりのノープリアスの生残率は50%以下であろう. 6. コペポディット第1期に変態後から成体となるまでの日数は水温25~26℃前後で雄では11~12日,雌では17~18日程度である.
URI: http://hdl.handle.net/10069/31272
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第27号

Citable URI : http://hdl.handle.net/10069/31272

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