SUMMARY OF STUDIES ON CLOSED-POLYCULTURE OF PENAEID SHRIMP WITH FISHES AND MOLUSCANS

摘要

cLOSED-POLYCULTURE OF Chinese penaeid shrimp, Taiwan red tilapia, and molluscans (con- stricted tagelus and bay scallop) was studied from 1995 to 1997 with the enclosure-experiment method, on a shrimp farm in Haiyang County, Shandong Province. Four structure-optimized closed-polyculture systems, i. e., the "shrimp-tagelus" system, the "shrimp-scallop" system, the "shrimp-tilapia" system and the "shrimp-ti lapia-tagelus" system, were worked out. All these polyculture systems were superior to shrimp monoculture sys- tem in economic and ecological efficiencies. The order of these polyculture systems in efficiencies was "shrimp- tilapia-tagelus">"shrimp-tagelus">"shrimp-tilapia"> "shrimp-scallop".