File:Bulletin (1953) (19807260953).jpg

Title: Bulletin
Identifier: bulletin2619531955illi (find matches)
Year: 1918 (1910s)
Authors: Illinois. Natural History Survey Division
Subjects: Natural history; Natural history
Publisher: Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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354 Illinois Natural History Survey Bulletin Vol.26, Art. 4
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Fig. 13.—View of a trammel net, showing the two exterior large-mesh nets and the inner small-mesh net. formed when the inner net is carried through a mesh opening of the left-exte- rior net. The fish is held in the pocket until released by a fisherman, fig. 14. Trammel nets can be fished in all types of habitats found on the Mississippi. The method by which the trammel net is fished differs with habitat. If a backwater or quiet stretch of the river is to be fished, the net is set, fig. 15. If the river channel is to be fished, the net is floated or drifted downstream. Trammel net sets and floats were made during the survey at some of the field sta- tions in the D-MR section of the river. A summary of the trammel net fishing data is presented in table 24. Except for data collected from experimental tram- mel netting at Grafton in October, 1944, and at Quincy in November of the same year, the data relative to catches made in trammel nets of various lengths and mesh sizes were combined. Data from the ex- perimental trammel netting at Grafton and at Quincy were not included in the previous report on the survey (Barnickol & Starrett 1951). In 1947, trammel nets accounted for 25.1 per cent of the commercial catch from the Missouri section of the river and 14.5 per cent from the Illinois section (Upper Mississippi River Conservation Committee 1948, third section :19). Catches With Set Trammel Nets. —The set method of trammel netting is the one most generally used by commer- cial fishermen of the upper Mississippi River. When this method is used, the net is set around a school of fish. Some- times it is laid out in a zigzag or spiral fashion. Frequently the shore line is used as a backstop for the net. After the net has been set around the fish, a disturb- ance in the water is created with plungers, fig. 16. Usually the trapped fish become excited and, when they attempt to escape

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