Appendix E: Field Scientist Report 



Contamination:: Industrial and domestic effluents from the city of Tampico are discharged into this 



area through the Panuco River. 



Laguna Madre (09/27/92). Oysters (Crassostrea virginica) were collected by tongs with the help 



of local fishermen from two soft bottom stations, about 300 meters apart, located in front of the 



local light house. Access to this area is by car from Matamoros to Puerto Mesquital and then by 



boat to the sampling site. 



Contamination:: No sources of contamination were observed in the area. 



Punta Banderas (10/01/92). Punta Banderas is located near Tijuana, Baja California, and about 



7 km to the south of the border with the US (California). Duplicate samples (Mytilus 



californianus) were collected from rocks along the coastline. 



Contamination:: Domestic and industrial effluents. 



Ensenada (10/02/92). Samples (Mytilus edulis) were collected from the rocks that form the north 



side of the main marine port of Ensenada. The site is located within city limits. 



Contamination:: Industrial and domestic effluents. Port activities. 



San Felipe (10/02/92). San Felipe is located on the coast of the Gulf of California (Cortez Sea) 



about 270 km from Ensenada. Bivalves were difficult to find because of high tides. One duplicate 



sample of C. columbiensis ("Chinese oysters") was collected 20 km to the south of San Felipe, 



near Punta Estrella. Hard bottom. 



Contamination:: No sources of contamination were observed in the area. 



San Carlos (10/05/92). San Carlos is a small village located in Magdalena Bay area on the 



Pacific coast of Baja California. Because of it easier access, this sampling site replaced Isla 



Magdalena, situated in front of San Carlos. One station was sampled in the vicinity of the local 



thermoelectric plant. 



Contamination:: Except for the thermoelectric plant, no obvious sources of contamination were 



observed. 



Mazatlan (10/10/92). Samples ("Rock oysters") were collected from two sites fairly apart from 



each other. The first site is located about 5 km from downtown Mazatlan in Cerrito Beach. The 



second site is within the city limits and about 200 meters to the north of the Instituto de Ciencias 



del Mar y Limnologia. In both cases, oysters, attached to rocks, were collected by local divers. 



Contamination:: No sources of contamination were observed in the first site. The second 



sampling site is affected by domestic effluents and Mazatlan Port. 



Altata-El Pabell6n (10/10/92). The Altata-El Pabell6n system is located about 220 km to the 



north of Mazatlan. In this site, duplicate samples (Crassostrea rizhophorae) were collected from 3 



stations. Oysters were attached to the roots of the mangroves. 



Contamination:: This is an area with extensive agriculture. Pesticides. 



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