caa a22 4500 477076149 CHVBK 20180405111439.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF02515730 doi (NATIONALLICENCE)springer-10.1007/BF02515730 Impacts per unit weight in catch by two types of fisheries on a chub mackerel population [Elektronische Daten] [Hiroyuki Matsuda, Kenjiro Fukase, Isamu Mitani, Kenji Asano] By using data on the age-specific annual fecundity and catches-at-age by each fishery in a chub mackerel (Scomber japonicus) population in the Pacific Ocean off Japan during 1970 to 1992, we evaluated the long-term fluctuation in impacts of two types of fisheries on the chub mackerel population. The purse-seine fishery consistently had a larger impact on the population than did the dip-net fishery, mainly because the catch by the former was much larger than that by the latter. To evaluate impact per unit weight in catch, we calculated the average reproductive value per unit weight over individuals caught by each fishery as an indicator of efficient use of bioresource. Because the proportion of immature fish caught by the purse-seine fishery was usually larger than that by the dip-net fishery, the impact per unit weight in catch by the purse-seine fishery was not always less than that by the dip-net fishery. Society of Population Ecology, 1996 reproductive value nationallicence cohort analysis nationallicence population impact assessment nationallicence dip-net fishery nationallicence purse-seine fishery nationallicence Matsuda Hiroyuki Department of Biology, Faculty of Science, Kyushu University, Higashi-ku, 812, Fukuoka, Japan aut Fukase Kenjiro Department of Biology, Faculty of Science, Kyushu University, Higashi-ku, 812, Fukuoka, Japan aut Mitani Isamu Sagami Bay Experiment Station, Kanagawa Prefectural Fisheries Research Institute, 1-2-1 Hayakawa, 250, Odawara, Japan aut Asano Kenji National Research Institute of Fisheries Science, Fukuura, Kanazawa-ku, 236, Yokohama, Japan aut Researches on Population Ecology Springer-Verlag 38/2(1996-12-01), 219-224 0034-5466 38:2<219 1996 38 10144 https://doi.org/10.1007/BF02515730 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02515730 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Matsuda Hiroyuki Department of Biology, Faculty of Science, Kyushu University, Higashi-ku, 812, Fukuoka, Japan aut NATIONALLICENCE 700 1- Fukase Kenjiro Department of Biology, Faculty of Science, Kyushu University, Higashi-ku, 812, Fukuoka, Japan aut NATIONALLICENCE 700 1- Mitani Isamu Sagami Bay Experiment Station, Kanagawa Prefectural Fisheries Research Institute, 1-2-1 Hayakawa, 250, Odawara, Japan aut NATIONALLICENCE 700 1- Asano Kenji National Research Institute of Fisheries Science, Fukuura, Kanazawa-ku, 236, Yokohama, Japan aut NATIONALLICENCE 773 0- Researches on Population Ecology Springer-Verlag 38/2(1996-12-01), 219-224 0034-5466 38:2<219 1996 38 10144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer