Effect of sublethal concentratons of four chemicals on susceptibility of juvenile rainbow trout (Oncorhynchus mykiss) to Saprolegniosis

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Applied and Environmental Microbiology; (United States)

OSTI ID:5314460

Carballo, M; Munoz, M J ^[1]

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1. CIT-I.N.I.A., Madrid (Spain)

The effects of sublethal concentrations of variety of chemicals on the susceptibility of rainbow trout (Oncorhynchus mykiss) juveniles to Saprolegnia parasitica infection was examined. Sublethal concentrations of un-ionized ammonia (0.05 mg/liter) and nitrite (0.12 mg/liter) increased ifsh susceptibility after 10 days of exposure to the toxin, this increase being higher for ammonia (75% and 20% morbidity) than for nitrite (20% and 0% morbidity, respectively) with inoculum doses of 1.4 {times} 10{sup 6} and 9.5 {times} 10{sup 5} zoospores per liter, respectively. Sublethal concentrations of copper (0.05 mg/liter) or cyanide (0.05 mg/liter) did not show enhancement of infection by S. parasitica, even though the toxin exposure was for 21 days and the inoculum doses were higher than those for the experiments with the nitrogen compounds (4 {times} 10{sup 6} and 3.2 {times} 10{sup 6}) zoospores per liter. However, infections began to appear in control animals.

• OSTI ID: 5314460
• Journal Information: Applied and Environmental Microbiology; (United States), Vol. 57:6; ISSN 0099-2240
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMMONIA
TOXICITY
COPPER
CYANIDES
NITRITES
PARASITES
INFECTIVITY
SENSITIVITY
TROUT
ANIMALS
AQUATIC ORGANISMS
ELEMENTS
FISHES
HYDRIDES
HYDROGEN COMPOUNDS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENTS
VERTEBRATES
560300* - Chemicals Metabolism & Toxicology