Macrobenthos Population Changes in Crystal Lake,Arkansas,Subsequent to Cage Culture of Fish,

摘要

A three-year study was conducted to determine the possible effects of cage culture of fish on the environment of Crystal Lake,Arkansas. The investigation consisted of three periods:pre (November 1971-October 1972),during (November 1972-October 1973),and post- (November 1973-October 1974) cage culture. Numbers and biomass of benthos per square meter for pre-,during-,and post-culture periods were 1353 (10.0g), 730 (8.8g),and 1028 (4.1g),respectively. Numerically, Chaoborus sp., Chironomidae,and Oligochaeta comprised more than 97%. Chaoborus was the most numerous organism before fish culture,but dominance shifted to the Oligochaeta after culture.