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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 5 | PAGES 923-942 | 1998
© Oxford University Press

research-article

Description of the developmental stages in Acartia bifilosa Giesbrecht (Copepoda: Calanoida)

W.D. Yoon, M.B. Shim1 and J.K. Choi2

West Sea Regional Fisheries Research Institute 98-36 Buksung dong 1 ga, Jung gu, 400-201, Inchon 1Oceanographic Division, National Oceanographic Research Institute 1-17, Hang dong 7ga, Jung gu, 400-037, Inchon, Korea

2Department of Oceanography, Inha University, 253 Yonghyun dong, Narn gu, Inchon,402-751, Korea

Received on September 28, 1996; accepted on December 15, 1997 The developmental stages and increase in length of Acartia bifilosa, a dominant planktonic copepod in Kyeonggi Bay, Yellow Sea, Korea, were investigated in a laboratory. Adults laid eggs at a rate of 2.5 eggs day–1 female–1 and up to 97% of eggs hatched. The eggs were 92 µm in diameter and larger than the eggs of other Acartia species. The body segmentation was recognizable at the fifth nauplius stage and sex distinction was possible at the fourth copepodite stage. Thesix nauplius stages took -7.5 days and the five copepodite stages -8.5 days. Sexually mature males and females appeared at the 16th day, and by the 20th day the adults laid eggs that hatched and grew successfully into the nauplius stages. The detailed morphological characteristics of each developmental stage are presented and discussed in relation to A.dausi.


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H. Y. Soh and H.-L. Suh
A new species of Acartia (Copepoda, Calanoida) from the Yellow Sea
J. Plankton Res., February 1, 2000; 22(2): 321 - 337.
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