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- W325285498 abstract "E. Fred Legner E f f e c t i v e foraging on chironomid midges bv an African cichlid hvbrid fish. Tilauia Frank W. Pelsue, Jr. mossambica x hornorum, in the paved Coyote Creek drainage of the Los Angeles basin has significantly suppressed the nuisance insect pest annually since 1977, eliminating the need for chemical treatments. At the same time, annual population explosions of the fish have occurred. Another fish, Tilapia zillii, feeds on noxious aquatic weeds in southeastern California lower deserts. Both fish thus offer a means of converting these urban and agricultural pests into food or fertilizer with minimal investment. Mass migrations of Tilapia mossambica x hornorurn upstream in the Coyote Creek drainage can be seen in currents of less than 1 meter per second whenever the water temperature exceeds C (68 F). The fish population radiates out from thermal overwintering locations near an electrical power generating plant about 3 kilometers (1.8 miles) upstream from the Pacific Ocean, where the drainage forms an unpaved estuary in which water levels vary with the tides from 1.2 to 2.4 meters. Warm water in the C range is discharged from the plant one Seine net catch of ~ i l ~ ~ i ~ hybrid, ,,,idgeeating fish that occur in annual population explosions in warm water. into the water there. The warm effluent creates a favorable breeding and overwintering habitat for Tilapia, which remains visibly abundant throughout the winter. The daily tidal washes d o not adversely affect these euryhaline species (able to live in both fresh and salt water). Migrations begin in the late spring as densities of about 20 adult fish per square meter spread out over the entire water-covered portion of the drainage. The paved channel upstream from the power plant generally averages 6 meters wide and 0.2 to 0.5 meter deep. Juvenile nonreproductive fish are usually seen accompanying the adults in various proportions. At this time the adult fish average 127 millimeters in length and 51 grams in weight (ranging from 30 to 200 grams). Thus, in 1 square meter, 75 adult fish would total about 3.8 kilograms (8.4 pounds) of fish biomass. When spread at this density over 18 kilometers (1 1 miles) of the drainage, the biomass can exceed 400,ooO kilograms, or 440 tons, produced primarily by an insect food source! Fish migration is in poorly defined, often overlapping schools at rates of 1 to 2 kilometers per hour against the current. By" @default.
- W325285498 created "2016-06-24" @default.
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- W325285498 date "1980-01-01" @default.
- W325285498 modified "2023-09-24" @default.
- W325285498 title "Tilapia fish turn insects and weeds into edible protein." @default.
- W325285498 hasPublicationYear "1980" @default.
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