摘要:

From 1945 to 1950 a series of fish-tagging studies has been conducted on two TVA mainstream reservoirs to determine the extent to which the crop is being harvested. The fish taken in hoop nets and seines were tagged in the upper left jaw with a No. 3 Monel metal tag and released in the immediate vicinity of their original capture. Sportsmen cooperated in the studies from 1948 through 1950. TVA census takers, Sportsmen's Club members, and the anglers checked the catches and turned in the tags taken from the fish.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[2:FHOTTM]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

Lake Pawhuska, an artificial lake of 95 surface acres, was first open for angling June 2, 1939. Continuous creel records were kept from the opening day until December 31, 1948. Numbers of fish removed as well as numbers of fishermen were recorded during the whole period. In addition, weights of fish were kept between January 1, 1943, and December 31, 1948.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[11:ATCCOL]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

Fish populations were sampled in two quarter-mile sections of the Coosa River near Childersburg, Alabama, during July and August, 1949. Sampling was done with hoop nets, wire baskets, and rotenone. In addition, the catch of a permanent fish trap was observed. The selectivity and limitations of each of these sampling methods are discussed. Since the methods used were to an appreciable extent complementary, it was possible to obtain significant information on nearly all important species. The most important species (by weight) taken were channel catfish, freshwater drum, smallmouth buffalo, flathead catfish, blue catfish, redhorse, and gizzard shad. None of the methods used was adequate for the sampling of game and pan species. The most important of these encountered were, however, white crappie, spotted black bass, and bluegill sunfish. Each of the methods failed completely to reveal the presence of one or more important species of fish. Since all sampling methods were selective, it was impossible to arrive at estimates of the relative or absolute abundance of the various species of fish. However, figures are given on the relative and absolute availability of the different species to the various sampling methods. The success of mark-and-recapture attempts to obtain estimates of relative abundance which were independent of the species selectivity of the gear was limited by the very small number of recaptures.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[28:SFPITC]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

In connection with a study of salmon and trout in a Swedish river, a trap was developed which has proved successful in capturing, unharmed, downstream-moving fish and other organisms. It consists of a fine-meshed screen set at a slight angle to the horizontal, on which water falls after passing over a weir. Fish and other solid particles are caught by the screening and washed down the incline into a trap placed below the lower end of the screen. The device is comparatively simple in design and construction, operates efficiently under widely varying amounts of flow, and may be left untended for periods up to 3 weeks in duration.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[41:ATFTCO]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

An attempt is made to demonstrate that the availability of fish to the angler in TVA reservoirs is not strictly correlated with their relative abundance. Crappie, which are subjected to much heavier fishing pressure than bass, are caught at a much lower rate as demonstrated by creel census and return of tagged fish. It is suggested that it may be possible to calculate a factor for differential availability of fish.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[46:ITAHDI]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

Lost Island Lake in northwest Iowa is a shallow glacial lake with a surface area of 1,260 acres. It is an important fishing lake, and management practices have centered around the maintenance of fishing for the black bullhead (Ameiurus m. melas). Following a partial freeze-out in 1940–41 a large year class of black bullheads was produced. The growth of this year class was observed from 1941 to 1950. By 1946 it was apparent that the growth was slow and stunting had occurred. This condition was coupled with the presence of a large carp (Cyprinus carpio) population and a low volume of potential food organisms. Recommendations were made to harvest as many carp as possible and to remove the catch limits on bullheads.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[50:ROIFHI]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

This study includes results of stomach examinations of 5,253 burbot captured near various ports along the north shore of Lake Erie from May, 1946, to May, 1947. Variations in major food items in relation to method of capture, season, locality, and the length of the burbot are examined. The major food items were evaluated by volume, number of items consumed, and the number of stomachs containing each item. Each criterion of abundance assisted in the determination of the role of the burbot in the food relationship of fish in the lake. Fish and invertebrates, largely Percidae and crustaceans, constituted the major part of the burbot's diet. Until its third year of life, the burbot feeds extensively on invertebrates, but from its third to fifth years, fish become the predominant food. Larger burbot had more food in their stomachs than did the smaller burbot and they consumed larger fish rather than larger numbers of fish.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[56:TFOTBL]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

Stomach contents of 551 young pike (11–152 millimeters in length), 345 small yellow perch, and 431 other fish representing 18 species were examined. All specimens were collected from an area widely used by spawning pike from Houghton Lake, Michigan. Organisms utilized for food by young pike included Entomostraca, insects (chiefly Chironomidae), tadpoles, minnows, darters, and other pike. As pike increased in size they passed through a definite feeding succession of Entomostraca to insects to vertebrates (chiefly fish). Cannibalism occurred, as shown by the fact that 13.3 percent of 354 pike 21 millimeters or more in total length had eaten other pike. Smallest pike found to be cannibals were 21 millimeters long. Competition between young pike and most other species of fish for invertebrate food was evident. The yellow perch was the most important fish predator of young pike. Competition for food, predation, and cannibalism undoubtedly were important factors in the high mortality of young pike in their first few weeks of life.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[67:FOYPEL]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

The Colorado River flows for nearly 225 miles through the Lake Mead National Recreational Area, Arizona-Nevada. Its character has been controlled and changed as the result of construction of Hoover and Davis Dams. The composition of the fish fauna has changed, also. There are now known from the area 3 native and 11 exotic species. Six additional fishes native to the Colorado River Basin and two other alien forms may occur.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[84:TSOTFF]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor

摘要:

A study of age and growth rates of four species of fish taken from the Missouri River between Holter Dam and Cascade, Montana, was made during the summers of 1948 and 1949. Four hundred and seventy-eight rainbow trout, 127 brown trout, 87 longnose suckers, and 223 western white suckers were examined. Age groups of rainbow trout ranged from I to VII; brown trout, I to IX; longnose suckers, III to VIII; western white suckers, I to VIII. Age group II was most predominant in rainbow and brown trout, group VI in longnose suckers, and group III in western white suckers. Greatest growth was attained during the second year in rainbow and brown trout, and during the first and third years for longnose and western white suckers, respectively. Trout growth is more rapid than sucker growth. The majority of trout were represented in age groups I-III, while suckers were predominantly represented in age groups IV-VIII. Coefficient of condition for 481 rainbow trout was 37.2 and for 117 brown trout was 34.6.

ISSN:0002-8487    

DOI:10.1577/1548-8659(1950)80[93:GROFSO]2.0.CO;2

出版商:Taylor & Francis Group    

年代:1951

数据来源: Taylor