Toxic effect of mercury on salmon larval, Oncorhynchus keta and O. kisutch
Chum salmon and coho salmon eggs were obtained at the stage of commencement of organogenesis. Following acclimation for 2 days, eggs were placed in batches of 500 on frames and incubated in 1 l of water at a constant 8/sup 0/C. Coho eggs were incubated in mercuric chloride solutions for 25 days. An experiment with larvae lasted 140 days. Chum embryos were placed in the same mercuric chloride solutions after hatching and were used in the experiment for 90 days. Mortality of the chum occurred during the first 40 days of exposure; it was 15% in the variant in which the concentration of the toxicant was 1 micro g/l, 13% at 5 micro g/l and 30% at 25 micro g/l, 12% in the control. Mass mortality of coho larvae was noted from beginning to end of hatching and was 12% in the variants in which the concentration of the toxicant was 1 micro g/l, 11% at 5 and 25 micro g/l, and 3% in the control. Consequently, the coho was more tolerant of mercury. An appreciable percentage mortality of larvae of this species was noted at mercury concentrations of 25 micro g/l. It is suggested that when fish develop from the stage of embryogenesis under conditions of an increased content of toxicants of the heavy metal group the most resistant individuals survive. A reduction in the concentration of biologically active metals was noted in salmon larvae reared in an environment with an increased concentration of mercury. 9 references, 1 figure, 3 tables.
- Research Organization:
- All-Union Research Institute of Marine Fisheries and Oceanography, Moscow, USSR
- OSTI ID:
- 5193405
- Journal Information:
- J. Ichthyol. (Engl. Transl.); (United States), Vol. 20:6; Other Information: Translated from Vopr. Ikhtiol.; 20: No. 6 (1980)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MERCURY CHLORIDES
BIOLOGICAL EFFECTS
SALMON
MORTALITY
SENSITIVITY
CHRONIC EXPOSURE
DOSE-RESPONSE RELATIONSHIPS
EMBRYOS
LARVAE
ONTOGENESIS
SPECIES DIVERSITY
TOXICITY
ANADROMOUS FISHES
ANIMALS
AQUATIC ORGANISMS
CHLORIDES
CHLORINE COMPOUNDS
FISHES
HALIDES
HALOGEN COMPOUNDS
MERCURY COMPOUNDS
MERCURY HALIDES
VERTEBRATES
560305* - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)