Aquaculture facilities are often located in the proximity of agricultural, industrial, or urban sources of pollution. Utilization of water downstream from pollution sources is a general concern to aquaculturists. Rivers and coastal waters receive heavy metals from industrial and urban wastes and effluents. In most aquatic animals, the main route of heavy metal entry is via food and drink. In addition to the accumulation of heavy metals in aquatic species, we and others have shown that HgCl2 and CH3HgCl inhibit intestinal absorption of amino acids and sugars. Here we present data to show the generality of this effect among several species. The data also show that HgCl2 is a more potent inhibitor than CH3HgCl. In order to further elucidate the mechanisms of action of mercury, we have examined the movement of 203HgCl2 and CH3 203HgCl from the intestinal lumen to the blood using a free swinnning in vivo procedure in the toadfish, Opsanus tau. Intestinal tissue and luminal fluid were analyzed after each incubation period. It was observed that both compounds appear in the tissue fraction within the first hour. CH3HgCl rapidly transfers to the blood, while HgCl2 exhibits a slow but evident transfer. Much of the HgCl2 in the tissue fraction was carried back to the luminal fluid by the mucus, suggesting binding to the luminal surface with little intracellular entry. CH3HgCl mainly moved into the tissue and then the blood with little or none being returned to the luminal fluid bound to mucus. Differences in the site of action of these two compounds was suggested.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of the World Aquaculture Society|
|State||Published - 1985|
ASJC Scopus subject areas
- Aquatic Science
- Agronomy and Crop Science