caa a22 4500 465811213 CHVBK 20180323112116.0 cr unu---uuuuu 170327e19901001xx s 000 0 eng 10.1007/BF02124909 doi (NATIONALLICENCE)springer-10.1007/BF02124909 Nakata Kaoru National Research Institute of Fisheries Science, 5-5-1, Kachidoki, Chuo-ku, 104, Tokyo, Japan aut Abundance of nauplii and protein synthesis activity of adult female copepods in the Kuroshio front during the Japanese sardine spawning season [Elektronische Daten] [Kaoru Nakata] In order to point out the potential importance of the Kuroshio front as a feeding ground for the early post larvae of the Japanese sardine, distributions of copepod nauplii—the principal food for the larvae—were investigated. Nauplii were abundant in and near the front and in a warm water mass off Ensyu-nada, where the concentration of chlorophylla was high. Adult females ofParacalanus sp. were dominant in the copepod group there, and the protein synthesis activity shown by the RNA/DNA ratio was high. It is expected that copepod egg productivity is enhanced in the area where food phytoplankton is abundant, because the RNA/DNA ratio showed a positive correlation to chlorophylla in situ. In and near the front, high chlorophylla concentration—which is probably supported by nutrient supply caused by local upwelling and/or eddies at the front—contributes to the high RNA/DNA ratio of the copepods. The relatively large biomass of copepod nauplii at the front may be supported by female's high egg productivity. It is supposed, as a result, that food availability for the early post larvae of the Japanese sardine is increased in and near the Kuroshio front. the Oceanographical Society of Japan, 1990 Journal of the Oceanographical Society of Japan Kluwer Academic Publishers 46/5(1990-10-01), 219-229 0029-8131 46:5<219 1990 46 10872 https://doi.org/10.1007/BF02124909 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02124909 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Nakata Kaoru National Research Institute of Fisheries Science, 5-5-1, Kachidoki, Chuo-ku, 104, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of the Oceanographical Society of Japan Kluwer Academic Publishers 46/5(1990-10-01), 219-229 0029-8131 46:5<219 1990 46 10872 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer