定置網漁獲物から見た相模湾東部沿岸海域における頭足類の季節的消長

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Cephalopod catches landed at the Miura Fishing Port in Sagami Bay were examined to determine the seasonal occurrence of cephalopods in the area. The bay is located on the Pacific coast of central Honshu (ca. 35°20'N,139°30'E) and has a broad bay area with a good circulation from the open water. Samples were collected weekly from March 1996 to December 2004 in six trap nets along the Miura Peninsula in the eastern part of the bay. A total of 40 species from 9 families were collected, and the seasonal occurrence was summarized for 32 species, excluding the 8 Octopodina species that were caught in low numbers. Species collected year-round included Sepia (Acanthosepion) lycidas, S. (Platysepia) esculenta, S. (Doratosepion) pardex, S. (D.) erostrata, S. (D.) tokioensis, S. (D.) sp., Euprymna berryi, Sepioteuthis lessoniana, Loligo (Photololigo) edulis, Todarodes pacificus and Ommastrephes bartramii. Species collected only in spring (March-May) included S. (D.) peterseni, S. (D.) kobiensis, S. (D.) misakiensis, Sepiellajaponica, Sepiadarium kochii and Onychoteuthis borealijaponica. Loliolus (Nipponololigo) japonica appeared from spring to summer (June-August), and Sthenoteuthis oualaniensis appeared only in summer. Species collected from summer to fall (September-November) included Enoploteuthis (Paraenoploteuthis) chuni, Thysanoteuthis rhombus, Eucleoteuthis luminosa and Chiroteuthis imperator. Sepia (D.) lorigera, S. (D.) appelloefi and Abralia (Heterabralia) andamanica appeared only in fall. Euprymna berryi and Loligo (Heterololigo) breekeri were collected through fall to spring. Watasenia scintillans and Moroteuthis loenbergi were collected only in winter (December-February). Onychoteuthis banksii was collected in winter and summer. Sepiids, sepiolids and loliginids that occure year-round and/or seasonally are considered to be neritic inhabitants and utilize coastal waters for feeding and/or reproduction. T. pacificus and O. bartrami are abundant in offshore waters, and some individuals pass through coastal waters during their north-south migrations. From summer to fall, the Kuroshio seldom flows into Sagami Bay that presumably transports subtropical and pelagic species such as E. (P.) chuni, C. imperator, T. rhombus and the two ommastrephids into coastal waters of the bay. From winter to spring, cold water flows from the Boso Peninsula presumably introduce mesopelagic species of W. scintillans and M. loenbergi in this region. The seasonal occurrence of cephalopods in trap nets along Miura Peninsula is associated with neritic cephalopods fauna in this region as well as large-scaled seasonal changes in circulation in Sagami Bay.
国立科学博物館の論文
2006-03-27

定置網漁獲物から見た相模湾東部沿岸海域における頭足類の季節的消長

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