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Tomoki Honryo Michio Kurata Tokihiko Okada Yoshifumi Sawada Yasunori Ishibashi 《Journal of the World Aquaculture Society》2014,45(5):523-531
To investigate the reason for the high mortality of cultured juvenile Pacific bluefin tuna (PBT), especially during land‐based culture, we examined the effect of the rate of light‐intensity change during the dawn period. Juvenile PBT kept in a natural light environment (control) were compared with those exposed to an artificially slowed change in light intensity during the dawn period (test group). For the test group, lamps, which were connected to automatic timers and placed above the rearing tank, were switched on from 0345 to 0515 h at 15‐min intervals. After 9 d, the survival rate of the test and control group was identical. Between Day 1 and Day 6, whole‐body cortisol levels were not different between groups. However, whole‐body glucose levels in the test group were significantly higher than those in the control group. Both groups displayed a diel rhythm in plasma cortisol concentration that peaked at 0300–0600 h. These results suggest that slowing the increase in light intensity during the dawn period did not improve survival and that low light intensity itself induces high mortality in cultured PBT juveniles. 相似文献
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E. Takahashi Y. Inaba H. Kurogi K. Sato Y. Goto Y. Ito T. Omori M. Matumoto 《Veterinary microbiology》1978,3(1):45-54
The multiplication of Akabane virus was not inhibited in the presence of 5-iodo-2′-deoxyuridine, indicating the presence of RNA. The virus was considered to have an envelope, as it was sensitive to ether and chloroform. It was readily inactivated by deoxycholate and trypsin, but was not precipitated by protamine sulphate. The virus was very labile at pH 3 and also rather heat-labile. Akabane virus was readily filtered through membrane filters of 200 or 100-nm pore size, but not through 50-nm filters. Equilibrium centrifugation in a CsCl density gradient gave a peak of infectivity and hemagglutinin at a density of 1.22 g/ml. The peak fractions thus obtained contained numerous virus particles, roughly spherical, variable in size, 70 to 130 nm in diameter, and mostly having a ragged, closely adherent envelope with projections, when examined, following phosphotungstic acid negative staining, in an electron microscope. 相似文献
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Hasegawa D Fujita M Nakamura S Takahashi K Orima H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2002,64(3):277-279
A Shetland sheepdog with epilepsy refractory to antiepileptic drugs was brought to the division of Veterinary Radiology at Nippon Veterinary and Animal Science University. Scalp electroencephalography and computed tomography was performed, but no abnormality was detected in either examination. To obtain detailed information, electrodes were implanted on the dura mater, and the electrocorticogram (ECoG) was recorded. In the ECoG, sporadic spikes were detected in the left parietal region, suggesting the presence of the epileptic focus in this region. After the dog's death, abnormalities of gyri were found in the region where spikes were detected in the ECoG. On histopathological examination, laminar malacia of the cingulate gyrus was observed. Furthermore, in the hippocampus, neuronal loss of pyramidal cells was observed. 相似文献
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Hara Y Nezu Y Harada Y Hasegawa D Fujita M Orima H Tagawa M 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2002,64(9):863-866
An intradural tumor in the upper cervical region was found in a dog with quadriparesis and chronic respiratory acidosis. Surgical removal of the tumor in the atlas and intraoperative radiotherapy were attempted. The tumor was histologically diagnosed as a neural glioma. A preoperative acid-base disturbance was dramatically improved after surgery. The clinical changes appeared in this case suggest that compression of the spinal cord at this region may cause paralysis of the respiratory muscles and secondarily result in chronic respiratory acidosis following the respiratory insufficiency. 相似文献
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ABSTRACT: The life history and ecology of the glowbelly Acropoma japonicum a commercially important fishery resource, were investigated in the Uwa Sea, Japan. Newly settled juveniles (0+ ) appeared at the end of the breeding season and reached maturity in the next season, i.e. when they became yearlings (1+ ). The yearlings made a gametic effort comparable to that of older fish. During the breeding season, the somatic conditions were more deteriorated for males than for females. That the deterioration of male somatic conditions was not attributable to a sexual difference in energy gain from feeding suggests that the males incurred higher energetic costs of reproduction despite their relatively low gonadosomatic indices. Such an energy depletion may increase the mortality risk, resulting in female-biased sex ratios in the older age classes. Most of the 1+ fish disappeared in winter following their first breeding. For A. japonicum , the observed precocity and short life span is notable because it is a higher consumer that is generally expected to show later maturation and longer life. As possible explanations for their disappearances, predation and postbreeding emaciation were less likely. While fishing is one of the most influential factors, the possibility of age-specific migration toward deeper waters remains to be examined. 相似文献
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ABSTRACT: The attacking potential of the scavenging amphipod Scopelocheirus onagawae on artificially injured hatchery-raised Japanese flounder Paralichthys olivaceus juveniles was investigated in relation to the degree of injury on the fish. All injured flounder juveniles were attacked by amphipods regardless of the degree of injury, while non-injured juveniles were not attacked. The attack by amphipods on the juveniles generally depended on the amount of glycine, a main feeding stimulant for the amphipod, released from the injury opening. The swimming ability of flounder juveniles was important to avoid the attack of amphipods. Furthermore, an area of injury allowing the amphipods to cling to the fish affects to the vulnerability of juveniles against the predation of amphipods. This study suggests that scavenging amphipods are potentially involved in the rapid reduction of the number of hatchery-raised juveniles. 相似文献