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Volume 41, Issue 4
Displaying 1-14 of 14 articles from this issue
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Kelvin K.P. Lim, Maurice Kottelat1995 Volume 41 Issue 4 Pages 359-365
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarinotetraodon salivator, a new species of freshwater pufferfish, is described from Sarawak. It differs from its only known congener, C. lorteti, in having a shallower body (depth 36-41% SL, vs. 45- 5 3), 10 anal fin rays (vs. 11), 16-17 pectoral fin rays (vs. 14-15), 17-18 (mode 18) vertebrae (vs. 15-17, mode 16), eyes situated nearer the dorsal profile of the head, a distinct pale blotch present under the lower lip, a white distal margin absent from the caudal fin, and a ventrum which is striped in females and cross-banded in mature males. A lectotype is designated for Tetraodon borneensis Regan, 1902 .View full abstractDownload PDF (6940K) -
Akihiko Yatsu1995 Volume 41 Issue 4 Pages 367-377
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSGonad condition and stomach contents were examined in 2257 specimens of Allothurznus fallai (463-896mm fork length) caught by surface driftnets from the high seas of the South Pacific (20-54°S, 74-150°W) during 1985-1987. Subtropical waters and the Peru Current north of 31°S were considered to be the spawning grounds of slender tuna during October, November and December. From November to February, feeding grounds were located in subantarctic waters and the Peru Current south of 38°S, where slender tuna preyed mainly upon euphausiids, squids, copepods, young myctophid fish and amphipods. The dominant species in the diets were Euphausia vallentini, E. lucens, Thysanoessa gregariaand Neocalanus tonsus throughout the subantarctic waters. Young of the squid, Martialia hyadesi, dominated in the Southeast Pacific and Moroteuthis spp.were common in the subantarctic waters of the central South Pacific. Hyperiid amphipods, Primno macropa and Themisto gaudichaudii, were common but gravimetrically much less important in the diet. Adult slender tuna were preyed upon by Isurus oxyrinchus, Prionace glauca, Xiphias gladius and Makaira mazara in subtropical waters, but not so in subantarctic waters. Allothunnus fallai was considered to be a highly migratory species, with a life-style adapted to the seasonally fluctuating biomass of zooplankton in subantarctic epipelagic waters.View full abstractDownload PDF (2872K) -
Gareth Nelson, Linda McCarthy1995 Volume 41 Issue 4 Pages 379-383
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSTwo new fishes of the genus Nematalosa (Clupeidae, Dorosomatinae), apparently allied with N. nasus, are described from the Persian/Arabian Gulf. The new species, N. resticularia and N. persara, are distinguishable from each other and from N. nasus by meristic characters, particularly number of prepectoral (abdominal) scutes.View full abstractDownload PDF (6036K) -
Toru Nagasawa, Tokimasa Kobayashi1995 Volume 41 Issue 4 Pages 385-396
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSLarval and juvenile stages of the rockfish, Sebastes thompsoni, are described and illustrated with particular reference to the development of head spines. Notochord flexion occurred between 4.6 and 7.8 mm SL. Transformation occurred between 16 and 22mm SL. Preflexion and flexion larvae of S.thompsoni were distinguished from related species by pigmentation of the dorsal and ventral midlines of the tail. Larvae and juveniles occurred in the coastal water around Honshu Island in the Sea of Japan where they were under the influence of the Tsushima warm current. The timing of their habitat shift from a pelagic life style to an association with drifting seaweed and food items of larvae and juveniles are also described and discussed .View full abstractDownload PDF (1679K) -
Izumi Akagawa, Youichi Tsukamoto, Muneo Okiyama1995 Volume 41 Issue 4 Pages 397-407
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSexual dimorphism, reproductive behaviour and early development of a small filefish, Brachaluteres ulvarum, were studied in the field and an aquarium. Males were larger than females (twice body weight) and showed a remarkable colour change during male-male competition during the reproductive season. A single male often followed a gravid female, although a pair-bond was not fixed. Only the larger male with more intense nuptial colouration continued to court until spawning. When the gravid female assumed a spawning position on the osculum of the calcareous sponge, Grantessa mitsukurii, the male also pushed his abdomen onto the osculum. Spawning by the female took 20-30 sec, whereas the male quickly departed. Parental care was not observed after mating. The eggs were demersal and adhesive, being the largest recorded (0.82mm in diameter) among monacanthids. Hatching occurred 6-8 days after spawning (19-22°C), newly-hatched larvae measuring 1.93-2.35mm in total length. Sexual dimorphism and pair spawning into the sponge are discussed in comparison with other monacanthids.View full abstractDownload PDF (10434K) -
Katsutoshi Watanabe, Hiroshi Maeda1995 Volume 41 Issue 4 Pages 409-420
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAlthough known to be distinct genetically and recently treated as different species taxonomically, two Japanese bagrid catfishes, Pseudobagrus aurantiacus (Temminck and Schlegel) and P. tokiensisDöderlein, have not been previously scrutinized as to their morphological differences. Examination of morphometric and osteological characters revealed that the former species differs from the latter in having a higher dorsal fin, the pectoral spine more prominently serrated on the anterior edge, more densely serrated on the posterior edge, and with 1-3 antrorse serrations at the base, a broader supraoccipital process, the supraneural as long as or longer than the supraoccipital process, a broader posterior process of the cleithrum (posterior tip angle>20°), and the hyomandibular widely separated from the metapterygoid.In addition, the body color pattern of young fish differs in the two species.View full abstractDownload PDF (5487K) -
Masato Moteki, Kiyoshi Fujita, Peter Last1995 Volume 41 Issue 4 Pages 421-427
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA new tropical pomfret, Brama pauciradiata, is described from trawled specimens and juveniles taken from the stomachs of the lancetfish (Alepisaurus ferox) collected from the central Pacific, Coral Sea, and eastern Indian Ocean. It appears to be a small species and may reach sexual maturity smaller than 100mm SL. It is distinguished from all other members of the genus in having 23-25 anal fin-rays, 7-10 scales between the lateral line and the origin of the dorsal fin, and 23-28 predorsal scales.View full abstractDownload PDF (2657K) -
Yoichi Sakai, Masanori Kohda1995 Volume 41 Issue 4 Pages 429-435
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFeeding ecology of the small angelfish Centropyge ferrugatus was studied at the coral reefs of Okinawa, Japan. This angelfish fed mainly on detritus and algae by nipping substrate within a small home range. In the breeding season, both sexes allocated usually about 60% of their time to foraging in the daylight hours, but females foraged more frequently than males. Centropyge ferrugatus frequently approached and followed similar-sized fishes of various species. Both sexes nipped more quickly and frequently in the association than in solitary foragings. Smaller individuals (females) more frequently associated with other fishes. Circumstantial evidence suggested a high predation pressure on the angelfish.We suggest that the association provides an antipredatory benefit to the angelfish, and enables the angelfish to devote more time to feeding because of less time required for the vigilance against predators.View full abstractDownload PDF (1073K) -
Morphological and Genetic Differences between Japanese and Chinese Sea Bass of the Genus LateolabraxKoji Yokogawa, Shingo Seki1995 Volume 41 Issue 4 Pages 437-445
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMorphological and genetic differences between Japanese and Chinese sea bass of the genus Lateolabrax were examined. Pronounced differences were recognized between the two forms in some morphological characters, in particular the number of pored lateral line scales and gill rakers, which differed sufficiently for unequivocal differentiation of the forms, when used in combination. Isozyme analyses of genetic characters indicated a complete replacement of alleles at the PROT-1* locus, and extreme differences in allelic frequencies at the GPI-1* and LDH* loci. The genetic distance (D value) between the Japanese and Chinese forms, calculated from isozymic allele frequencies, was 0.174, a figure significant at the inter-specific level. The considerable morphological and genetic differences suggested that the sea bass from China is a distinct species from L.japonicus.View full abstractDownload PDF (6293K) -
Konstantina Iliadou, Lev Fishelson1995 Volume 41 Issue 4 Pages 447-454
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe morphology and histology of the catfish (Parasilurus aristotelis) testes were studied during the spawning period (March to August). Unlike other typical catfish, the testes of P. aristotelis are devoid of seminal vesicles. Both the cranial and caudal regions have a similar structure, with spermatogenic rather than secretory function. The main sperm duct of each unpaired testes is unusual in being divided into two parts: an upper one lined with germinal epithelium; and a short lower section lined with cuboidal epithelium. The seasonal reproductivity in this catfish is less pronounced than in other species. Its breeding season is protracted with continuous, asynchronous spermiogenesis. The testes histological structure resembles that of other teleosts. Observations revealed highly significant correlations (p<0 .01;p<0.001) between: male body length and quantity of seminiferous tubules in a unit area of sectional surface; diameter of seminiferous tubules and their quantity; weight of testes and diameter of seminiferous tubules; and total number of seminiferous tubules vs. sperm-laden tubules.View full abstractDownload PDF (8156K) -
Yukio Iwatsuki, Tetsuo Yoshino, Takeshi Kanda, Daniel Golani1995 Volume 41 Issue 4 Pages 455-461
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA valid haemulid fish, Pomadasys quadrilineatus Shen and Lin, 1984, is redescribed . It is distributed on the East Asian Shelf, including Taiwan, Okinawa Island, and Miyazaki Prefecture (southeastern part of Kyushu Island, Japan). This species has been synonymized with P. striatum (Gilchrist and Thompson, 1908) and P. stridens (Forsskål, 1775), but differs in color pattern, meristic characters and geographic distribution. Pomadasys quadrilineatus is distinguished from the other two species by having five rather than four stripes on the body and lower counts (5-6 versus more than 6) for upper limb gill rakers. Pomadasys stridens is distributed off South Africa, in the Red Sea, in the eastern Mediterranean and off India, whereas P. striatum is distributed only off South Africa and in the Red Sea, including the Gulf of Suez. A neotype of P. stridens (Forsskål, 1775) is designated on the basis of a specimen collected from the type locality, the Red Sea.View full abstractDownload PDF (5984K) -
Chavalit Vidthayanon, Maurice Kottelat1995 Volume 41 Issue 4 Pages 463-465
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Juan M. Díaz de Astarloa, Daniel E. Figueroa1995 Volume 41 Issue 4 Pages 466-468
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS -
Youichi Tsukamoto, Yasuhiro Ueno, Takashi Minami, Muneo Okiyama1995 Volume 41 Issue 4 Pages 469-473
Published: February 21, 1995
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS
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