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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Fisheries > Bulletin > Bulletin of the Faculty of Fisheries > 第38号 >

二枚貝類外套腔に棲息する橈脚類Ostrincola koeの越冬期における加温飼育

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Title: 二枚貝類外套腔に棲息する橈脚類Ostrincola koeの越冬期における加温飼育
Other Titles: Consecutive Breeding Ostrincola koe (Copepoda, Cyclopoida), an Associate of Marine Pelecypods, through its Over-wintering Period Using the Gills of a Host Clam as Food
Authors: 高, 良夫 / 吉越, 一馬
Authors (alternative): Ko, Yoshio / Yoshikoshi, Kazuma
Issue Date: Dec-1974
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.38, pp.101-107; 1974
Abstract: Ostrincola koe was reared from November (1973) to March (1974) at about 24℃ through 5 consecutive generations, each brood being kept in a beaker containing 80 ml of natural sea water and served with the gills of a host clam, Tapes (Amygdala) philippinarum as food. Nauplii needed no foods to molt into the first copepodid stage. There were 5 naupliar and 6 copepodid stages. The sexes are easily distinguishable externally even at the first copepodid stage by the size of the maxilliped. The shortest generation time observed was 18 days. The survival to adult stage in each of all the generations excluding the first generation varied from a minimum of 43% in the fourth and a maximum of 54% in the fifth and the average survival in the whole series of the second through fifth generations (164 reared individuals; 19 broods) was 47%. No apparent differences in body length and number of eggs per female laid at a time were found among the five generations and also between the reared and natural copepods. As only the non-ovigerous adult females winter in the natural stock of O. koe, there is no doubt that the raising of water temperature stimulated the growth, metamorphosis, maturation and reproduction of reared individuals. / 1973年11月末から1974年3月までOstrincola koeの飼育実験を行った。1) 約80mlの海水を入れた100mlビーカーに本種の1腹の個体を収容し,アサリの切離した鰓片を与えて,約24℃(22.1~26.2℃)の水温で飼育した。2) 天然条件では10・11月の本種の卵からは年間の最後の世代(第5世代)の個体が孵化し,これらのうちの雌だけが未抱卵のまゝ成体で越冬して翌年4月に抱卵するのであるが,本実験の飼育条件では,野外から11月18日に採集された卵から,3月末までに5世代が連続して生産された。3) 従って加温措置は明らかに本種の成長,変態,成熟および産卵を促進する。4) 第2乃至第5飼育世代の平均生残率は47%で,1回の平均抱卵数は8.6,雌の成体の平均体長は1.04mmであった。この平均抱卵数および雌成体の体長は原産地の秋季のそれらとほゞ等値であり,また飼育世代間に発育速度,卵数,体長および生残率に関して顕著な差異は認められなかった。
URI: http://hdl.handle.net/10069/30804
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第38号

Citable URI : http://hdl.handle.net/10069/30804

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