The fish and shrimp production of the Huizache-Caimanero Lagoon, located on the Mexican Pacific, has been decreasing in recent years, which may be due to environmental and pollution conditions.
Therefore, water and sediment samples were analysed to quantify nutrients, pesticides, and coliform bacteria.
The results indicated that the system is polluted considerably during the rainy season due to continental runoff carrying municipal and agricultural wastes, thereby increasing coliform pollution and nitrate concentrations.
This is less apparent for phosphates and pesticides.
We conclude that pollution and environmental changes are important causes decreasing production ; recent studies have reported biochemical and physiological alteration in aquatic organisms exposed to similar levels of pesticides as reported here.
During the rainy season, coliform levels are above permissible levels established by sanitary regulations, and are thus pose a risk to public health.
Mots-clés Pascal : Lagune, Productivité biologique, Déclin, Aquiculture, Pollution eau, Coliforme, Bactérie, Pesticide, Eau ruissellement, Accumulation biologique, Zone littorale, Mangrove, Mexique, Amérique Centrale, Amérique, Milieu saumâtre, Facteur milieu, Pisces, Vertebrata, Macrura, Decapoda, Crustacea, Arthropoda, Invertebrata
Mots-clés Pascal anglais : Coastal lagoon, Biological productivity, Decay, Aquaculture, Water pollution, Coliforms, Bacteria, Pesticides, Runoff water, Biological accumulation, Littoral zone, Mangrove, Mexico, Central America, America, Brackish water environment, Environmental factor, Pisces, Vertebrata, Macrura, Decapoda, Crustacea, Arthropoda, Invertebrata
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0147026
Code Inist : 002A14D05D. Création : 21/07/1998.