. Combined biennial report for the period ending 1942/1946. Pennsylvania Fish Commission; Fisheries; Fish culture. Upper Delaware. The area selected will then be the subject of in- tensive investigation until all waters there have been covered. From there the Survey will move to adjacent waters and proceed in this manner until the entire State is covered. A general outline for procedure follows. The work on lakes will naturally vary from that on streams but, for the sake of brevity, both types of work are grouped together. 1. History: Planting records, fishing intensity, fishing success. 2. Ph
. Combined biennial report for the period ending 1942/1946. Pennsylvania Fish Commission; Fisheries; Fish culture. Upper Delaware. The area selected will then be the subject of in- tensive investigation until all waters there have been covered. From there the Survey will move to adjacent waters and proceed in this manner until the entire State is covered. A general outline for procedure follows. The work on lakes will naturally vary from that on streams but, for the sake of brevity, both types of work are grouped together. 1. History: Planting records, fishing intensity, fishing success. 2. Physical Studies: Altitude, character of watershed and shore line, fluctuations, tributaries, springs, barriers, diversions, gradient, width, depth, volume, velocity, temperature, type bottom, cover^ color of water, accessibility. 3. Chemical Studies: Chemical analysis of water, source and type of pollution, analysis of bottom soils. 4. Biological Studies: Fishes present, age groups, fish populations, vertebrates other than fishes, aquatic vegetation, kinds and abundance of fish food, plankton studies, bottom food, organisms studies, parasites, predators, spawning areas and success of natural propaga- tion, turbidity, effects of pollution on plant and animal life. & Special Studies: (See later.) 6, Recommendations: The information gathered will be used to write a recommendation for the management of each water. Personnel: The Survey should probably start on a small scale until the proper equipment and personnel can be obtained and the many problems of techniques and methods worked out. When tlie Survey gets into '*full swing" it will be necessary to have the services of a chemist, a botanist, an ichthyologist and perhaps other specialists. These men would be hired during the tm^g^^ qtOAtbs and would prepare a report of their findings. Duration: Such a program is a long-range one. It is impossible to state how long it would require to cover all public waters. Within certa
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