Fish Hatchery Management - fisheries & aquaculture

TRANSPORTATION OF LIVE FISHES 363TABLE42. POUNDS oF CENTRARCHIDS THAT CAN BE DISTRIBUTED PER GALLON oFWATER AT TEMPERATURES RANGING BETWEEN 65'AND 1]5'F. (AFTER WILSON I950.)UNO. OF FISHSIZEAPPROXIMA'I'I] NOPOUNDS OF FISHPER LB.(INCHES)OF FISH PER CAL,PER GAL.25.O100.0400.01.000.04.03.02.01.025.067.0200.0333.01.000.660.500.33aAlthoughhours at these rates.time is not given by Wilson, the literature indicates minimal problems up to l6catfish will safely hold 2 poundsgallon of water.(+) If tne transportation timebe decreased by 25%.of 8-inch, or 4 pounds of l6-inch fish perexceeds 12 hours, the loading rate should(S) If tne transportation time exceeds 16 hours, loading rates should bedecreased by 50% or a complete water change should be arranged.(6) During the winter, hauling temperatures of 45-50'F are preferred,whereas 60-70'F are preferable during summer months.LARGEMOUTH BASS, BLUEGILL, AND OTHER CENTRARCHIDSIn keeping with current stocking requirements, centrarchids are transportedprimarily as small fingerlings at light densities (faUte +Z).Largemouth bass fingerlings of 6-10 inches can be transported at 2.0pounds per gallon of water for up to l0 hours without loss. This loadingrate was used when several southwestern hatcheries transported largerlargemouth bass fingerlings and most trips were considered highly successful.Aeration was provided by aerators and bottled oxygen introduced at0.144.21 cubic foot per minute.STRIPED BASSThe Fish and Wildlife Service in the southeastern United States hauledstriped bass averaging 1,000 per pound at a rate of 0.15 pounds per gallonof water for up to l0 hours with few problems. Fingerlings averaging fiveper pound were transported at rates of 1.5 pounds per gallon for l0 hoursand,0.75 pounds per gallon for 15 hours. Recirculation systems and agitatorsboth have been used successfully. The recommended water temperaturefor hauling striped bass is 55'-65'F. Successful short hauls have beenmade at higher temperatures.Striped bass averaging 500 per pound have been successfully transportedat loadings approaching 0.5 pound per gallon for periods of 19 to 24 hours.