著者

塩垣 優 道津 喜衛

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.23, no.3, pp.125-129, 1976-12-30 (Released:2011-02-23)

参考文献数

6

被引用文献数

1

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長崎市近郊の三和町および野母崎町の海岸で採集したミミズハゼ属の一新種Luciogobius platycephalus(新称:ヤリミミズハゼ), および, 大分県佐伯市佐志生港から採集した同じくミミズハゼ属の一新種である盲魚のLuciogobius dormitoris(新称:ネムリミミズハゼについて記載し, あわせて, 主として筆者が新たに得た材料にもとづき, 上記の二種を含む日本産のLuciogobius, Inu, Expedioの各属のハゼ11類種についてそれぞれの区別点を明らかにした.

著者

塩垣 優

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.28, no.1, pp.70-79, 1981-05-25 (Released:2011-02-23)

参考文献数

10

被引用文献数

1

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The life history of Pterogobius zacalles (Gobiidae) was studied from 1973 to 1979 at Moura, Mutsu Bay, located at the northern tip of Honshu.Field observations were made mainly by means of SCUBA diving, and spawning behavior and early life history were observed in the aquarium.At Moura P.zacalles inhabits shallow rocky bottoms at depths from 5 to 30 m, mostly less than 10 m.They are solitary dwellers and live around nests burrowed under stones.During their growing period at water temperatures over 10°C they hover or rest around nest stones.During the cold seasons below 8°C in water temperature they conceal themselves in the nests and rest inactive.The spawning season at Moura seems to extend from late April to late May.Spawning takes place under the nest stones.Egg masses are guarded by males.In the aquarium one female spawned three times with the same male.The number of laid eggs and length of the long axis of the egg membrane tended to decrease as spawning was repeated.To attract the female the male hover around her, fully extending his all fins, opening his mouth and gill membranes, and slowly fanning his caudal fin.The body and all fins of the male turned black at that time, in sharp contrast with the reddish orange margins of the dorsal and caudal fins.The female did not show color change.Eggs hatched 27 days after the blastula stage at water temperatures of 7.2°-13.7°C.Newly hatched prolarvae were 4.95 to 5.34 mm in total length.The larvae completely consumed the yolk in 6 to 9 days, when they attained 5.90 to 7.10 mm in total length.Larvae from egg masses collected from natural habitats and reared in the aquarium survived for only 31 days after hatching, reaching a maximum total length of 16.0mm.Young fish of 3-4cm in total length were found from the middle to end of July in small schools near the bottom at the habitat of adults.Larger individuals (4-5 cm in total length) were seen either singly or in groups of two or three fish in August.In September they grew over 6 cm in total length and were observed occupying nests built under stones.In one year both sexes became fully mature, attaining total lengths of 9 to 11 cm.They changed from copepode-feeding at early stages to crustacea-polychaeta-feeding as their life mode shifted from grouping to solitary dwelling..

著者

塩垣 優

出版者

長崎大学水産学部

雑誌

長崎大学水産学部研究報告 (ISSN:05471427)

巻号頁・発行日

no.35, pp.11-39, 1973-08

著者

塩垣 優

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.29, no.4, pp.446-455, 1983-03-10 (Released:2011-07-04)

参考文献数

29

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Chirolophis japonicus is known from as far north as Peter the Great Bay and Hokkaido south to southern Korea and Tsintao, northern China, and grows over 50cm TL.In Mutsu Bay, they inhabit rocky shallow coastal waters.They show strong cryptic habits and are almost impossible to ob-serve by SCUBA diving observations.They mainly feed on the sea cucumber Sticopus japonicus and the gastropod Neptunea arthritica by snapping them off with the aid of the sharp continuous cutting edge of both jaws.The digestive tract is very long, being 0.7-1.5 times of its total length.The stomach is provided with 5-7 well-developed pyloric caeca.They attain sexual maturity at over ca.25cm TL in males and 30cm TL in females.In Mutsu Bay, the spawning period extends from late November to December, when the water temperature falls below 10°C.The ovary is of the two-lobed type and deeply separated basally.Secondary sexual characters are recognized in the elevation of the nape backward to the origin of dorsal fin, the elongation of the anterior four dorsal spines and the darkening of body coloration in males.In spawning experiments in the aquarium, female parents guarded egg masses in all two cases.Eggs were attached to each other but did not adhere to other substrata.Spawnings took place in a tube-like hollow of a concrete block.Eggs were pressed on the wall of the hollow.Female parents guarded eggs in the hollow, but did not coil their body on the eggs.Egg membranes are spherical, light milky white, and measure 2.50±0.06mm (n=30) in diameter.They do not form any adhesive process, and are attached to each other at adhesive points or small faces.Yolk is light yellow, containing a large light yellow oil globule but without white cloudy material.Time for the hatching is estimated to be about two months under water temperatures of 3.5-10°C.Newly hatched prolarvae are 12.2-13.5mm TL, and are very slender and compressed.The distance from the tip of the snout to the anal opening is 35 % of TL.Myomere counts are 62 64 (15-16+46-47).Rearing experiments of larvae show that yolk is consumed in two weeks after hatching.Larvae reached 16.5 19.3mm TL two weeks after hatching, and 20.4-24.2mm TL in 39 days, attaining the early juvenile stage.In Mutsu Bay, planktonic juveniles of 29.2 34.0mm TL were collected with fish lamps at Moura in March and April.Early benthonic juveniles, 29.2-34.0mm TL, were collected from baskets for scallop culture in April and May.The present species is characterized by scaled cheeks, but in smaller specimens less than ca.20cm TL scales cannot be detected by naked eyes, because of their small size and the fact that they are imbedded in the skin.Examination of the development of dentition in cleared and stained.specimens shows that primary small teeth develop in the planktonic stage, arranged in two alternating rows.They are replaced by secondary developed incisors at ca.10cm TL.These incisors form a continuous cutting edge composed of two accurately alternating rows.On the basis of the development of squamation on the cheeks and coloration of C.japonicus, Bryostemma otohime Jordan et Snyder, 1902, which was described from the 82mm TL holotype collected from Hakodate, southern Hokkaido, is considered to be the young form of C.japonicus.Azuma emmnion Jordan et Snyder, 1902 is considered to be a male of C.japonicus.

著者

塩垣 優

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:18847374)

巻号頁・発行日

vol.29, no.1, pp.102-104, 1982

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A total of 70 larvae and juveniles of <I>Cryptacanthodes bergi</I> (Cryptacanthodidae, Blennioidei) were collected by a fish larva net towed off the east coast of Aomori Pref.in the northwestern Pacific Ocean.The larvae and juveniles, measuring from about 15 to 31.5 mm TL, were collected at the sea surface from March to June, mainly by night hauls.In a 18.0mm TL postlarva, the body is elongated and compressed.The anus opens a little ahead of the midpoint of the body.The eyes and pectoral fins are large.The body is densely pigmented along each myotome except for the abdomen and caudal peduncle.Along the middorsal line, there is a longitudinal white area which is wider anteriorly.The myotome count is 74 (24+50).In a 30.0mm TL juvenile, the body is much elongated and compressed, and the eyes and pectoral fins are relatively small.The lower jaw protrudes beyond the upper jaw and forms a wry mouth.The pelvic fins are absent.Head sensory canals are not well developed and have some outer openings.<BR>A gravid female, collected on Oct.6, 1977, from muddy bottom at a depth of 50-60m in Mutsu Bay off Aomori City, has 249 maturing orange yellow eggs measuring 1.7 to 2.2mm in diameter.Its ovary is a single type.<BR>A similarity in the distribution of melanophores between larvae of <I>C.bergi and Zaprora silenus</I> (Zaproridae) was detected.