. Commercial fisheries review. Fisheries; Fish trade. Fig, 1 - —-acre ponds used for rearing siirimp. SAND LEVEE 4' SAND LEVEE. Fig. 2 - Cioss section of pond showing location of filter box and standpipe. estimate of 25-percentage survival, and apro- duction goal of 1,000 pounds of whole shrimp peracre, we stocked 9,000 shrimp in each pond. Three weeks after stocking and, weekly there- after, 40 shrimp from each pond were weighed, measured, and returned to the pond. In the static-water pond, chlorophyll a measurements were made periodically from surface-water samples to check the effect of fer
. Commercial fisheries review. Fisheries; Fish trade. Fig, 1 - —-acre ponds used for rearing siirimp. SAND LEVEE 4' SAND LEVEE. Fig. 2 - Cioss section of pond showing location of filter box and standpipe. estimate of 25-percentage survival, and apro- duction goal of 1,000 pounds of whole shrimp peracre, we stocked 9,000 shrimp in each pond. Three weeks after stocking and, weekly there- after, 40 shrimp from each pond were weighed, measured, and returned to the pond. In the static-water pond, chlorophyll a measurements were made periodically from surface-water samples to check the effect of fertilizer on the growth of phytoplankton. GROWTH AND PRODUCTION 1. The Static-Water Pond On March 26, 12 days before stocking the postlai-vae, the researchers made an initial application of 160 pounds of soluble inorganic fertilizer with an NPK (nitrogen, phosphorus, potassium) ratio of 3:2:1. An additional 25 pounds of fertilizer (NPK ratio of 4:2:1) were applied on April 9, 2 days after stocking. Two days after the initial application, a plankton bloom characterized by a slight green coloration was evident. On April 19, the chlo- rophyll a density was (milligrams per liter), a value 35 tinaes greater than that in the adjacent lagoon. The water was pea green and a mat of algae had formed on the bottom along the pond's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries. [Washington] : National Marine Fisheries Service; [for sale by the Supt. of Docs. , U. S. Govt. Print. Off. ]
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