著者
石原 龍雄 松本 涼子
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2018, no.39, pp.93-100, 2018-02-28 (Released:2021-12-03)

The endemic species Rhacophorus arboreus (Anura: Rhacophoridae) is widely distributed through main island of Japan, but it has always been considered as rare in Kanagawa Prefecture. The first records of this species of Kanagawa Prefecture, in a limited area, date from 1983. This study is the first report of Rhacophorus arboreus from Hakonetown, in the western part of the Prefecture. In Hakone-town this species was first recognized from the Kojiri area, Shirayuri-dai-enchi, near Lake Ashinoko in 2005, and it has expanded its distribution toward the Northwest, Sengoku-hara, from 2009 onwards. There are three possible centres of origin for the Hakone-town population: Nagao, Gotenba-city, Shizuoka Prefecture; Mt. Kintoki, Minamiashigara-city; and Yugawara-town. Of these three, Nagao, Gotenba-city is closest to Hakone-town and the species may have extended its range from Nagao to the Kojiri area of Hakone-town.
著者
山田 和彦 工藤 孝浩 瀬能 宏
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2014, no.35, pp.41-44, 2014 (Released:2022-04-17)

The ichthyofauna of Sagami Bay was surveyed on the basis of landed fishes on Misaki Fish Market. Although 593 fish species had been recorded since 1986, we newly added seven species in this report. Among the above seven species, Minous pusillus of them is new to the bay.
著者
工藤 孝浩
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2013, no.34, pp.41-42, 2013 (Released:2022-04-17)

A specimen of Homarus americanus H. Milne Edwards, 1837 was collected by beam trawl net at bottom off Yokohama, Tokyo Bay. This is the first record on the bases of specimen from the bay.
著者
日置 尚之 来栖 可奈 島 瑞帆 増田 絢 松本 淳
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2019, no.40, pp.1-4, 2019 (Released:2019-09-01)

Myxobolus nagaraensis (Myxozoa: Myxosporea) was first reported in 2007 in freshwater gobies (Rhinogobius sp.) from Nagara River in the Gifu Prefecture, Japan. Although freshwater gobies are common fish species found in rivers of the Kanagawa Prefecture, infection of these fishes with M. nagaraensis has not been reported. Therefore, this study surveyed for M. nagaraensis infection in freshwater gobies from Sakai River, which runs through the Kanagawa Prefecture. Freshwater gobies were captured using hand nets at different locations along the Sakai River in November 2017 and February 2018. Diseased fish displaying enlarged abdomens and nodules in the caudal peduncle were caught from 2 locations which were 20 km apart. Cysts excised from these diseased fish contained parasitic spores resembling the morphology of M. nagaraensis. DNA was extracted from the cysts and the small subunit ribosomal RNA gene was amplified (SSU rDNA). Based on homology search, the amplified partial product was 99.6% identical with M. nagaraensis SSU rDNA (Accession no. AB274267). This is the first report of M. nagaraensis infection in freshwater gobies from a river in Kanagawa. Since prevalence of the parasite and its pathogenicity to the goby populations are still unclear, continued examination of other rivers in the prefecture is crucial.
著者
三井 翔太 瀬能 宏
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2018, no.39, pp.87-91, 2018-02-28 (Released:2021-12-03)

Two specimens of Trichiurus sp. 2 sensu Nakabo, 2000 were collected from eastern Sagami Bay, southern Japan, in November 2012 and January 2017. These specimens represent the first records from Sagami Bay, and the northernmost records for the species. The occurrence of T. sp. 2 from Sagami Bay in winter is attributed to transportation by the warm Kuroshio Current in summer or autumn, and suggests that survivability is affected by the development of a body of warm water.
著者
加登岡 大希 崎山 直夫 瀬能 宏
出版者
神奈川県立生命の星・地球博物館(旧神奈川県立博物館)
雑誌
神奈川自然誌資料 (ISSN:03889009)
巻号頁・発行日
vol.2019, no.40, pp.59-65, 2019 (Released:2019-09-01)

Morphological changes accompanying the growth of the shortspine spurdog, Squalus mitsukurii (Squaliformes: Squalidae) were examined in ten specimens of 304.1 to 952.6 mm in total length (TL), collected from Sagami and Suruga bays, Japan. The caudal fin of specimens less than 330 mm TL has a broad white margin on the upper lobe, and the lower lobe is overall white. The upper lobe changes from having a rounded tip to a pointed tip at total lengths between about 450 to 500 mm, and the white posterior margin of the caudal fin also narrows in specimens of this size. The dermal denticles on the anterior part of the first dorsal fin in smaller specimen are arranged with a space between each one, bearing a tricuspid leaf-like portion and a stalk at the base. On the other hand, the dermal denticles change to a rhomboidal shape and become arranged in a muriform pattern without spaces between them in larger specimens. In comparison with Squalus sp. 2 specimens less than 324.1 mm TL, it is suggested that S. mitsukurii specimens of the same size are distinguished in having the second dorsal spine less covered with dermal denticles.