The major streams in Chester County, Pennsylvania were studied to determine their environmental state, and to relate this condition to land- use patterns. A biological numerical rating system on a scale of 1 to 10 was developed to classify stream conditions. One indicates extremely toxic conditions and 10 balanced biological conditions. The majority of the streams studied had ratings between 4 and

Authors

Bruce W. Lium

Water Resources Mission Area, Pennsylvania Water Science Center

January 1, 1977

You asked for it! Worried about parasites while ponds have ice cover? here are some ideas

No abstract available.

Authors

M. Martin

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1977

You asked for it! Your fish farming success for the year can depend upon management in the spring

No abstract available.

Authors

M. Martin

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1977

Supplemental dietary methionine prevents cataracts in lake trout fed isolated soybean protein

No abstract available at this time.

Authors

H. A. Poston, R.C. Riis, G. L. Rumsey, H. G. Ketola

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1977

Survival of monosex grass carp in small ponds

Little information is available on the survival of grass carp (Ctenopharyngodon idella) in ponds &mdash especially on the survival of fry to large fingerling stage, during the time when the most mortality would be expected. Development of monosex (all female) grass carp at the Fish Farming Experimental Station by the technique of artificial gynogenesis (Stanley et al. 1975) enabled us to observe s

Authors

A.E. Thomas, R.R. Carter

Ecosystems Mission Area, Eastern Ecological Science Center

January 1, 1977