ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493113

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493114

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493115

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493116

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493117

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1945.10493112

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

摘要:

The introduction of smallmouth black bass (Micropterus dolomieu) into lakes of Saskatchewan has been attempted unsuccessfully over a period of forty years but never in freshwater lakes of the Churchill River drainage. The need for better game fish in the newly established Prince Albert National Park led to the present experiment which was carried on under close observation. Adult bass were brought from Eastern Canada, confined in rearing enclosures screened off in protected bays and provided with artificial nests. Stocking was begun in 1936 and continued for five summers with some interruption. A total of 1,500 adults was transported and 260,000 fry have been reared. These have been released in Waskesiu and the Heart Lakes.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1943)73[19:TEIOSB]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

摘要:

A natural outbreak of columnaris disease among wild adult and hatchery-reared fingerling salmon in the State of Washington is described. The disease is identified by the recovery of the causative organism, Bacillus columnaris Davis, which may be readily identified by its characteristic action in forming columns on the surfaces of infected material held in a water mount on a microscope slide. The gross lesions vary in appearance according to the particular organ affected but are formed, essentially, by the progressive necrosis and disintegration of the tissues. The tissues primarily affected are skin, body musculature, and the gills. Cultivation of the causative organism in tryptone solutions is recorded. Controlled, laboratory-induced infections indicate that among the cold-water fishes, columnaris disease is of little consequence to fingerlings at water temperatures below 55° F., but becomes highly pathogenic at temperatures in excess of 70° F. Between these temperature thresholds, the degree and severity of the infection is markedly influenced by factors adverse to the host. No effective control measures have been found.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1943)73[32:CAADOC]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

摘要:

Hoop nets were fished in all four major habitats in Wheeler Reservoir, a T.V.A. main-stream impoundment, during a six-months' period in 1941. Long-nose gar, mooneye, skipjack, mud catfish, black bullhead, white bass, sauger, and crappie were best represented in the catch from the fast tailwater; drum were taken in greatest numbers in the upper “third,” which had retained many of the characteristics of the original river; rough-fish species were most commonly caught in the middle section with its extensive shallow backwaters; and Kentucky bass were best represented in the lower “third” where the water is less turbid than in other portions of the reservoir.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1943)73[37:ACOTHC]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor

摘要:

A peculiar carp, (Cyprinus carpio), was caught in the upper Illinois river. The fish was 7 years old and had a total length of 9 inches as compared to 20 inches for a normal carp of like age. The last 8 thoracic and the 17 caudal vertebrae had been softened and squeezed together, and ossification and the formation of new bone had caused permanent fusion. The condition has been named Spondylitis ossificans piscium and bears a marked resemblance to Arthritis deformans.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1943)73[41:ACOOOT]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1945

数据来源: Taylor