Geology topics
Publications and source records attributed to Roger L. Herman.
Rainbow trout were fed gossypol acetate or cottonseed meals containing gossypol for 14 months. Toxic effects were indicated by growth depression, reduced hematocrit, hemo-globin, and total plasma protein. Histological changes were noted, particularly in the liver and kidney.
Mortality was high in an experimental group of rainbow trout ( Salmo gairdneri ) fed estradiol as part of a sex reversal study. Pathology included hypertrophy of the kidneys and liver and heavy accumulations of presumptive vitellogenin.
The objectives of this study were to evaluate survival of striped bass ( Morone saxatilis ) prolarvae and yearlings in the Potomac River by using in situ test chambers; correlate survival of both striped bass life stages with the presence of water quality conditions, inorganic contaminants, and organic contaminants and conduct histological examinations of surviving yearling striped bass. Survival of striped bass prolarvae ranged from 4.5–22.5% at three field locations during three 96-h experiments; control survival was ≥81%. Yearling survival ranged from 0–77.5% at three river stations during two 7-d experiments; highest mortality occurred at the upriver station. Control survival was 100%. Poor survival of striped bass prolarvae was likely related to the presence of inorganic contaminants (monomeric aluminum, cadmium, and copper) acting singly or synergistically and sudden decreases in water temperature (< 11°C). Yearling mortality at the upriver station was likely correlated with high pH conditions from a point source discharge and perhaps inorganic contaminants. Histological examinations of yearlings suggested that test organisms exposed to Potomac River water exhibited adverse changes in the kidney.
Fingerling Atlantic salmon ( Salmo solar ) fed a production diet deficient in pyridoxine showed several significant effects: increased mortality; behavioral changes; degenerative changes in kidneys, ovaries, and liver; a paucity of thyroid colloid; and hyperplasia of renal hematopoietic tissue. Changes in nerve tissue were equivocal.
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