Determination of Seasonal Changes in Water Depth

 Water level records from the well and from Lake

 Trafford (U. S. Department of Interior. Geological Survey.

 1975, 1976) during the period of the sampling study were

 plotted. Water levels on different dates were superimposed

 on the cross-sectional profiles to show water depths in

 different parts of the study site on different dates.



 Quantitative Sampling of Aquatic Organisms

 From June 1, 1974, through September 14, 1975,

 periodic quantitative samples of fish and aquatic

 invertebrates were taken in the pond and marsh. The marsh

 was the focus of the study during the wet season and early

 part of the dry season of 1974. Sampli ig centered on the

 pond during the latter part of that dry season and during

 the wet season of 1975. For the marsh sampling, flagged

 stakes marking sampling stations were set up at 100 ft

 (30.5 m) intervals along the survey line leading out into

 the marsh from what was on June 1, 1974, the edge of the

 pond (approximately 20 ft into the pond from the border of

 Sesbania). Stations were designated "Station 100,"

 "Station 200," "Station 300," etc. according to their

 distance in feet from the edge of the pond; the stake at

 the edge of the pond being "Station 0." From 3 to 10

 collections were made at three locations along this

 transect at approximately weekly intervals from June 1,

1974, through January 22, 1975. From October 22, 1975,