. Commercial fisheries review. Fisheries; Fish trade. 12 salinity comparable to the brackish water of the Louisiana marshes. LSU scientists believe the fish can be raised in brackish water ponds in the wide- spread Louisiana marsh. Pompano fish farms would develop--as with catfish. If the research shows pompano can be farmed suc- cessfully, "pompano crops may become an important new industry for the marsh coun- ; In the first experiments, pompano finger- lings placed in ponds did not grow to market size in a year. But the researchers are opti- mistic. Texas Research on Shrimp Far
. Commercial fisheries review. Fisheries; Fish trade. 12 salinity comparable to the brackish water of the Louisiana marshes. LSU scientists believe the fish can be raised in brackish water ponds in the wide- spread Louisiana marsh. Pompano fish farms would develop--as with catfish. If the research shows pompano can be farmed suc- cessfully, "pompano crops may become an important new industry for the marsh coun- ; In the first experiments, pompano finger- lings placed in ponds did not grow to market size in a year. But the researchers are opti- mistic. Texas Research on Shrimp Farming Near Angleton, Texas, TAMU is experi- menting with marsh use for shrimp farming. Researchers are developing manmade ponds in the boggy marsh. Three natural marsh ponds were leveed and ten half-acre reservoir type ponds were built. InAprU. 1969, 17,000 post-larvaebrown shrimp averaging 8 mm were put in a 1^- acre natural pond. Ninety days later, the shrimp had reached mean length of 147 mm; market value was 856 per pound. In July, a harvest flume designed by the researchers collected the shrimp. The flume is a floodgate through which water is drained from pond. Shrimp are trapped in a net stretched across the flume. The brown shrimp were susceptible to the flume. They reacted as though they were returning to the Gulf on an outgoing tide. Fish Predation A Problem In the first experiment, the chief problem was that fish ate many shrimp. To evaluate effect of the fish predation, the natural ponds were stocked in August with juvenile white shrimp. A fish toxicant, rotenone, was ap- plied to one pond. Diuron was used to con- trol all aquatic vegetation. A commercial catfish food supplemented natural foods. Early sampling showed survival in all ponds greater than in the earlier experiment. Where predators were eliminated, growth rate was highest. The researchers advise that an accurate measure of survival will have to wait the shrimp Destruction of vulu^iblc cstuarine m
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