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Volume 36, Issue 1
Displaying 1-10 of 10 articles from this issue
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Hideaki ACHIHA, Tomio NAKAMURA1988 Volume 36 Issue 1 Pages 1-6
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESS -
Daisuke FUJITA1988 Volume 36 Issue 1 Pages 7-10
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSPhotosynthetic and respiratory rates of Lithophyllum yessoense Foslie, a dominant crustose coralline alga on barren ground along the southwestern coast of Hokkaido, was measured four times a year using the polarographic method.
Photosynthesis was found to increase with the logarithm of light intensity up to 100W/m2 and was constant between 100 and 1, 000W/m2. Both photosynthetic rate (net and total) and respiratory rate were the highest in August.View full abstractDownload PDF (367K) -
Hideki YASUNOBU, Kiyokuni MUROGA, Keigo MARUYAMA1988 Volume 36 Issue 1 Pages 11-20
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSAt Momoshima Field Station of Japan Sea-Farming Association, plenty of red sea-bream Pagrus major juveniles have been raised from newly hatched larvae every year in earthen ponds. Since 1982, a peculiar mass mortality has been noticed in the ponds and mortality rate has become higher year by year. The characteristic symptoms of the diseased fish include remarkably swollen intestine and spleen, the former being full with undigested zoo-planktons and the latter with erythrocytes.
Bacterial examinations on the mass mortalities of the larvae with intestinal swelling were made at the station in 1986. As the result, bacterial number in the intestine of diseased fish proved higher than that of normal fish by one hundred or one thousand times. Vibrio, the most predominant group, was found 20% greater in diseased fish as compared with normal fish, however, different Vibrio species were isolated as predominant species at each case of mortality.
Seven strains of Vibrio, which was predominantly isolated from diseased fish, were tested of their pathogenicity against red seabream larvae by oral administrations. However, neither the disease symptom nor apparent mortality were observed among the tested fish. Although the cause of this disease could not be clarified by this study, an importance of the primary cause (s) leading to digestive disorder was discussed.View full abstractDownload PDF (2373K) -
Minoru TANDA1988 Volume 36 Issue 1 Pages 21-25
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSRecently, hatchery-reared ‘hirame’ Paralichthys olivaceus, have been released at many places in this country. But these ‘hirame’ juvenile have not necessarily been released at the right place. The sand quality was one of the important conditions required of a place at which ‘hirame’ are released. Therefore the ability of creeping in sand of ‘hirame’ juvenile P. olivaceus, was examined. The ‘hirame’ juvenile examined may be categorised into four groups according to length, averaging total length of 23.0mm, 54.3mm, 75.4mm and 99.6mm. The sand of the sea bed was divided into seven sections according to grain size. Sand from each section was laid on the bottom of a 10L plastic container. Five to twenty fish were transferred to each container. The creeping ratio was measured visually at two and four hours after beginning of examination.
As the ‘hirame’ grew, their ability of creeping in sand increased. The 23.0mm TL ‘hirame’ was able to creep in the sand that was smaller than 0.5mm in grain size, but not in the sand that was larger than 0.5mm in grain size. The ‘hirame’ groups measuring more than 54.3mm TL were able to creep in the sand smaller than 1.0mm in grain size, but not in the sand that was larger than 1.0mm in grain size.View full abstractDownload PDF (557K) -
Kazuma MUTSUTANI1988 Volume 36 Issue 1 Pages 27-32
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
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Shuhei MATSUURA, Masayuki FURUICHI, Katsuhiko MARUYAMA, Michiya MATSUY ...1988 Volume 36 Issue 1 Pages 33-39
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSNatural daily spawning by one 4-year-old female red sea bream, Pagrus major, was observed. Daily spawning occurred during the period from May 23 to June 27, 1987. The total number of eggs spawned during the entire spawning season and the maximum number of eggs spawned in one day were 1, 900, 000 and 120, 000, respectively. The average rate of fertilization was 91.5% indicating normal spawning behavior, but the hatching rate varied between 24.5% and 98.1%.
Starvation mortality of newly hatched larvae was examined in nine experimental groups according to a time series. Percentage survival was maximal in an experimental group in the middle spawning season between June 6 and June 12. Average diameters of spawned eggs varied between 0.90mm at the beginning and 0.86mm at the end of the spawning season, decreasing with elevation of water temperature, and showed a correlation (r=-0.745) with the water temperature on the day before spawning. The growth of the 4-year-old female during the period from May 18 (pre-spawning) to July 9 (post-spawning) was 2mm in fork length and 25g in body weight, almost the same as that of the male, showing that individual growth was suppressed during the spawning season.View full abstractDownload PDF (827K) -
Toshio IWAI, Terukazu KUBOMATSU1988 Volume 36 Issue 1 Pages 41-44
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
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Ken-ichi YAMAMOTO, Osamu HIRANO1988 Volume 36 Issue 1 Pages 45-48
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSOxygen consumptions in the rose bitterling, the field gudgeon, the dark chub and the carp under progressive hypoxic condition were kept the same levels as those under normoxic condition, and gradually decreased at below 40, 50, 35 and 15% in oxygen saturation, respectively. But the consumption in the common minnow gradually increased under the hypoxic condition.View full abstractDownload PDF (381K) -
Ken-ichi YAMAMOTO, Osamu HIRANO, Yoichi HARA, Kenzo MISHIRO1988 Volume 36 Issue 1 Pages 49-52
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSOxygen saturation of water (So2, %) at which fish surfaced at the rate of 50% were in the order Zacco temminckii (18.7) and Z. platypus (18.1) >Rhodeus ocellatus ocellatus (17.1) and Gnathopogon elongates elongatus (17.0) >Anguilla japonica (16.3) >Ischikauia steenackeri (13.7) >Cyprinus carpio (11.3) and Sarotherodon nilotica (11.1) >Lepomis macrochirus (8.7) >Pelteobagrus nudiceps (7.9) >Carassius carassius langsdorfii (7) . So2 (%) at which fish were asphyxiated at the rate of 50% were in the order Z. p. (16.1) >G. e. e. (15.5) >Z. t. (14.1) >C. c. (10.0) >I. s. (9.6) >R. o. o. (9.0) >A. j. (7) >S. n. (6.8) > L. m. (6.0) and P. n. (6.0) >C. c. l. (5) .
In fishes used for the experiment, there were little difference in So2 between when one fish surfaced and when all fish did (1-5%), between when one fish asphyxiated and when all fish did (1-2%), and between when all fish surfaced and when one fish asphyxiated (0-6%) .View full abstractDownload PDF (398K) -
Histological Changes Caused by Various DietsKenji NAMBA, Heisuke NAKAGAWA, Masaya OKABE, Izuru KAKUTA, Hidemi KUMA ...1988 Volume 36 Issue 1 Pages 53-64
Published: June 01, 1988
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSFive different diets, sand lance, commercial pellet, moist pellet (commercial pellet: sand lance=1: 1), krill and sardine, solely fed on fugu Takifugu rubripes averaging 28.7g in weight for 60 days and its dietetically-induced changes were examined pathohistologically.
Effect of the diet on growth was higher in sand lance, moist pellet, krill, commercial pellet and sardine in this order. The highest mortality (13%) was caused by the sardine feeding. Remarkable fatty degeneration of the liver was observed in each group, but with a difference in size of fat drops formed according to kinds of diet. For the kidney, glomerular hypertrophy and hypertrophy of Bowman capsule's outer lobe in both the sardine and the commercial pellet groups were observed. For digestive tract, extreme vacuolar degeneration in tunica propria mucosa was observed in the sardine fed group. For muscle, granular degeneration and vacuolar degeneration were observed in the sardine fed group.View full abstractDownload PDF (9713K)
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