Accumulation and elimination of dieldrin by channel catfish (Ictalurus punctatus)

The effect of impounding a river on the pesticide concentration in warmwater fish

“…Many studies (Paz, 1976;Shannon, 1974) found that pesticide residue levels in fish increased with increasing length, weight, and age. In con trast; other studies (Lyman et al, 1968;Murphy, 1971) indicated no positive relationship at all.…”

“…For instance, algae, daphnia, and guppies were found to store dieldrin 1,282, 13,954, and 49,307 times the concentration in the water, respectively (Reinert, 1972). Aquatic organisms may ab sorb pesticides directly from water as well as indirectly from pesticidecontaminated food organisms (Bridges et , 1963;Mulla et al, 1966;Shannon, 1974). The amount accumulated is dependent upon the characteris tics of the pesticides, particularly its lipophilic!ty and water solubility, the quantity of pesticide available in the given environment, the physiology and behavior of the organisms, and environmental conditions (Gakstatter and Weiss, 1967;Johnson, 1973;Morley, 1977;Ruckelshaus, 1972).…”

“…However, different fish species vairy greatly in their ability to store pesticide residues in their tissues (Lyman et al, 1968;Paz, 1976). Intraspecific variation in accumulation and elimination of pesticides is ascribed to age, sex, size, lipid con tent, ai'd others (Anderson and Everhart, 1966;Buhler and Shanks, 1970;Holden, 1966;Johnson and Lew, 1970;Matsunmra, 1977;Murphy, 1971;Paz, 1976;Reinerc, 1969;Reinert and Bergman, 1974;Shannon, 1974).…”