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Volume 27, Issue 4
Displaying 1-12 of 12 articles from this issue
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Hin-Kiu Mok1981 Volume 27 Issue 4 Pages 281-290
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe variations of the relation and relative size of the posterior cardinal veins and the fusion of the left and right kidneys in some major fish groups are described.The morphological variations of these characters in the two systems are interpreted and hypotheses concerning the phylogenetic interrelationships of the fish groups are made.The neoposterior cardinal veins being equally long is treated as a plesiomorphic character state for actinopterygians.In the vast majority of these fishes the right neoposterior cardinal.vein is much longer and larger in diameter than the left one.The left neoposterior cardinal vein of osteoglossomorphs (including hicdontids) is larger and longer than the right.This synapomorphic character state supports their monophyletic relationships.The presence of a connection between the hepatic and neoposterior cardinal vein in brachiopterygians suggests their affinity with other sarcopterygians.The presence of an anterior median sinus in chondrichthyans formed by the fused parts of the anterior neoposterior cardinal veins may be synapomorphic for gnathostomes and indicates the monophyly of chondrichthyans.Complete separation of the left and right kidneys which is here hypothesized as an apomorphic character state of the gnathostome kidney morphology has appeared at least three times in this fish group.This character state casts light on the monophyly of Brachiopterygii, Dipnoi, and Tetrapoda.Occurrence of similar character states in other gnathostomes is due to convergence.View full abstractDownload PDF (1710K) -
Brian W. Coad1981 Volume 27 Issue 4 Pages 291-295
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new sisorid catfish, Glyptothorax silviae, is described from the Iranian provinces of Khuzestan and Lorestan.The new species differs from all other members of the genus in the Tigris-Euphrates basin by the absence of striated or elongate tubercles on the head and body, and variously by possession of a pinnate or incomplete thoracic adhesive apparatus, a long adipose fin equal to the interspace between the dorsal and adipose fins, pectoral fin not extending to the pelvic fin origin, long caudal peduncle (4.7-.5.2 in SL) and short head length (3.7-4.1 in SL).View full abstractDownload PDF (6909K) -
Mitsugu Toyoshima1981 Volume 27 Issue 4 Pages 296-300
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe genus Lycozoarces has included two norminal species: L.regani Popov and L.hubbsi Popov.L.regani was based on the female and L.hubbsi on the male, and differences between them are due to sexual dimorphism.L.hubbsi is a junior synonym of L.regani. Meristic and morphometric data and color notes are presented.A specimen from the Okhotsk coast of Hokkaido represents the first record of L.regani from Japan.View full abstractDownload PDF (789K) -
Kiichiro Yamamoto1981 Volume 27 Issue 4 Pages 301-308
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe cleavage of the Japanese eel eggs is discoidal.The furrows of the cleavage from the first to the fourth are meridional and the resultant blastomeres are arranged in a single layer.After the 32-cell stage, some blastomeres are divided vertically while others horizontally.They increase in number to form a morula composed of three or four cell layers.Between the blastomeres of the morula many intercellular spaces are present, but no cavity is discernible between the blastodisc and the yolk.When the egg reaches the blastula stage, segmented blastomeres gradually come together under the epidermic stratum to form the blastoderm.Together with this change, the yolk under the blastodisc begins to flatten and develop into the periblast.As a result, a cavity appears between the blastoderm and periblast.This is the blastocoel of an early stage.As the egg develops further, the blastocoel becomes larger due to the close arrangement of the blastodermal cells and the sinking of the yolk surface.View full abstractDownload PDF (4340K) -
Héctor R. Fuentes1981 Volume 27 Issue 4 Pages 309-315
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe dietary composition of Semicossyphus maculatus in the littoral zone of three localities in northern Chile, Huayquique, Playa Blanca, and Los Verdes, was studied.The diet of this species did not vary by localities, and no significant differences in food were observed between two size groups and between sexes.The guts of specimens captured at depths from 1 m to 15 m usually contained mobile and sessile benthic organisms, principally Bivalvia, Gastropoda, Decapoda (Crustacea), and Cirripedia.Based on the present evidence the feeding pattern of this species is discussed.View full abstractDownload PDF (961K) -
Biswas Niva, Jagdish Ojha, J.S.Datta Munshi1981 Volume 27 Issue 4 Pages 316-326
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMeasurements of the dimensions of the different gills, skin and the opercular chambers of an estuarine goby, Boleophthalmus boddaerti, were made and the data were analysed with respect to body weight using allometric transformations (Y=aWb).The slope (b) for area of the total gill surface was 0.709, for skin 0.687, for the opercular chambers 0.544, and for their combined respiratory surface 0.686.The slope values for the surface area of the 1st, 2nd, 3rd and 4th gill arches were 0.757, 0.758, 0.615 and 0.570, respectively.The slope for secondary lamellae per mm was-0.083 and that for the bilateral surface areas of an average sized lamella 0.498.
These results indicate differences in growth patterns for the dimensions of the different gills.The growth-related decreases in the number of secondary lamellae per mm and size of an average secondary lamella, together with evidence from “drowning” experiments and diffusing capacity calculation, suggest that this estuarine goby is better adapted for aquatic respiration.View full abstractDownload PDF (1438K) -
Stephen Ralston1981 Volume 27 Issue 4 Pages 327-329
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSRecently a female of the pomacanthid angelfish, Centropyge interruptus (Tanaka), was collected at Kure Atoll in the Hawaiian Islands.Previously considered a Japanese endemic (Tominaga and Yasuda, 1973;Masuda et al., 1975), this specimen constitutes the first documented case of C.interruptus having been taken elsewhere and is the subject of this short note.View full abstractDownload PDF (2678K) -
Kunio Amaoka, Tsutomu Kanayama1981 Volume 27 Issue 4 Pages 330-332
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Goro Takahata1981 Volume 27 Issue 4 Pages 333-338
Published: February 15, 1981
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSEndocrine cells were observed in the digestive tracts of the medaka, Oryzias latipes, by light and electron microscopy.These cells showed positive staining with lead haematoxylin.Tests for argentaffin and chromaffin reaction were negative.Endocrine cells are always found straggled in the mucous epithelium.They have many secretory granules in the cytoplasm.Five types of endocrine cells (I, II, III, IV, and V) are identified by the morphological characteristics of their secretory granules.In every endocrine cell type, the basal part directly faces the basement membrane of the epithelium.The apical part of the type IV and V cells reaches the digestive lumen, and microvilli are recognized in the apical cytoplasm.The cell membrane of the base and side often appears hollow and Ω-shaped.It is suggested that secretory granules may be released into the connective tissue or intercellular space by the emiocytosis.View full abstractDownload PDF (10882K) -
Kazuko Hosokawa, Toru Fusimi, Toshihiko Matsusato1981 Volume 27 Issue 4 Pages 339-343
Published: February 15, 1981
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSThe chorion of eggs in the porgy, Pagrus major, was observed by transmission and scanning electron microscopy.During the breeding season.mature unfertilized eggs and eggs immediately after fertilization were used as materials.The materials were fixed in 2%glutalaldehyde (pH 7.2) and I tetroxide (pH 7.2) for 2 and 1 hours, respectively, according to the usual method for prepared samples.Using scanning electron microscopy.the micropyle apparatus and numerous pits were observed on the chorion surface.The micropyle apparatus consisted of well-defined spiral layers and seemed to be of the tunnel type.When observed by transmission electron microscopy, the longitudinal profile of the chorion was composed of two layers, a thick inner layer and a thin outer layer composing the pits.As a result of applying Lloyd's “mean crowding” to the number of pits, it can be concluded that the distribution appearance of pits has a uniform distribution pattern.View full abstractDownload PDF (10584K) -
Mitsuo Sato1981 Volume 27 Issue 4 Pages 344-346
Published: February 15, 1981
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDuring an electron microscopic study of mucous cells of the skin epidermis of a freshwater sculpin, Cottus hilgendorfi, crystalline bodies were accidentally observed within the nucleus of the cell.These bodies are always restricted to the nucleus, never projecting through the nuclear envelope into the cytoplasm.In section, they show a variety of profiles such as rectangular, triangular, parallelogrammatic or trapezoidal.They have no limiting membrane.One nucleus generally contains one body, but sometimes two or more.The body can be recognized in a very young mucous cell and persists in mature or fully mature cells, and may finally be expelled from the cell together with the nucleus as mucous substances are released.View full abstractDownload PDF (5072K) -
Noritomo Komada1981 Volume 27 Issue 4 Pages 347-349
Published: February 15, 1981
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSDenticles (banjoshi in Japanese term) constituting comb-like teeth were extracted from about 200 adult ayu, Plecoglossus altivelis Temminck et Schlegel: about 100 fish from the Yahagi River (anadromous type) and about 100 fish which were collected in Lake Biwa and then cultured for two months in a pond (lacustrine type).The two types of samples were analyzed for calcium, magnesium and ash contents by chelatmetry.Calcium made up 22-23% of the dry weight of denticles, and the total ash accounted for about 54% of the dry weight of denticles.Amounts of calcium, magnesium and ash were not different in anadromous and lacustrine types of the species.The results were basically similar to the amounts of calcium, magnesium and ash obtained for rats and rabbits.View full abstractDownload PDF (426K)
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