摘要:

Lake sturgeon populations, markedly reduced throughout most of their range, now support commercial or sport fisheries in few regions. A sport fishery in the Lake Winnebago area annually attracts approximately 2,000 spearers who take from about 400 to more than 2,800 fish. When spearing conditions are favorable more persons participate in the sport and enjoy a greater rate of success. The estimated catch of 2,828 lake sturgeon speared in 1953, weighing approximately 100,000 pounds, represented the largest catch on record. This annual yield of lake sturgeon is exceeded in North America only by commercial fisheries for white and green sturgeon in the States of Washington and Oregon.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[207:AGAPOT]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

摘要:

The lengths of creek chubs, Semotilus a. atromaculatus, of the same year class differ significantly in the various pollutional zones of Lytle Creek, Clinton County, Ohio. In the clean-water zone above a sewage treatment plant outfall, where the stream is very small, the 0-year creek chub taken in August 1952 averaged 42.3 millimeters in total length. The creek chubs of the same year class, found in the upper portion of the recovery zone, averaged 53.3 millimeters, while in the enriched lower portion of the recovery zone they were larger, averaging 63.8 millimeters. In the lower clean-water zone, the fish were smaller and had a mean length of 52.0 millimeters.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[228:TLAGOY]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

摘要:

The relationship between, yellow perch and cutthroat trout in Thompson Lakes, Montana, was investigated in the summers of 1952 and 1953. These lakes originally contained cutthroat trout and were later planted with yellow perch. The spawning time of the yellow perch was in early May, and for the cutthroat trout in late May. The population of yellow perch was large and growth was very slow. Although the number of cutthroat trout was small, the growth rate for this species was about average. The food of yellow perch was largely immature aquatic insects and plankton while that of cutthroat trout was mostly mature aquatic insects and small perch. Yellow perch were commonly distributed along the lake margins and concentrations of perch fry and adults were found in these areas in the spring. During this period the salmonid fishes were predominately in the deep water. Spot poisoning of the yellow perch concentrations practically destroyed all of the fish in the treated area. Management suggestions are given.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[239:SERBYP]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

摘要:

The early life history of the yellow perch, an important commercial species in the Red Lakes, Minnesota, has been studied with special reference to length at scale formation, growth rate during first season of life, and food habits as they relate to growth and survival. Scales are fully imbricated in the area of 12th to 14th lateral line scales at 24 millimeters total length. There is a wide annual varition in first season's growth which is not correlated with growth in older fish. Body-scale relationship is rectilinear from 24 to 280 millimeters. Length-weight relationship during the first year is expressed by the equation W = 0.6198 × 10−5L3.1251which is very similar to that describing the relationship in later years. Stomach analysis indicates food is primarily plankton but in some seasons fish may be strongly dependent on bottom forms. Variations in food availability appear to be associated with changes in growth and may have a major influence on survival.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[249:ELHOTY]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

摘要:

The increase in the angling for steelhead trout (Salmo gairdneri irideus) since the end of World War II caused fishery biologists in the State of Washington to re-evaluate their management policies and to search for a means of building up runs of adult steelhead trout in depleted or heavily fished streams. Experiments were conducted to determine the proper size and time of planting of hatchery-reared steelhead trout to obtain best returns of adults. It was found that the planting of migrant-sized steelhead trout during the normal migration period of wild fish provided the best returns. Runs of adult steelhead trout have been built substantially up by plants of hatchery-reared fish as evidenced by trap returns on planted streams.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[261:MOSTIT]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

摘要:

Henrys Lake, a 6,500-acre reservoir at the elevation of 6,472 feet in eastern Idaho, has a maximum depth of 21 feet and an average depth of 12 feet. Seasonal variation of weather and shallow, fertile waters are the major environmental factors that influence the Henrys Lake biotic community. Phytoplankton is abundant and composed primarily of blue-green algae and cladocerans and copepods are the dominant zooplankters. Higher aquatic vegetation has developed over the entire bottom of the lake. The standing crop of bottom and plant-in-habiting fauna in Henrys Lake for 1951 is estimated to have been 606 pounds per acre.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1954)84[275:EOTCTI]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1955.10492673

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1955.10492675

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1955.10492676

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor

ISSN:0002-8487    

DOI:10.1577/00028487.1955.10492677

出版商:Taylor & Francis Group    

年代:1955

数据来源: Taylor