Appendix E: Field Scientist Report 



MEXICO 



Cancun (09/16/92). No samples were obtained from this location. Several sites were searched 



for bivalves along the Nichupte Lagoon coast between Cancun and Punta Nizuc. Conversations 



with local fishermen indicated that small bivalves might be found near the mouth of the Manati 



river. No sampling was attempted there. 



Laguna de T£rminos (09/18/92). At this site samples (Crassostrea virginica) were obtained 



from local fishermen returning from their daily oystering activities. The sampling site, near the 



Boca de Atasta, is located about 45 minutes by boat from Ciudad del Carmen. Oysters are lying 



on a hard bottom. 



Contamination:: Sources of contamination are petroleum-related activities and local fisheries in the 



lagoon and nearby Gulf coastal areas. There are several important rivers that discharge in the 



lagoon (e.g., Palizada, Chumpan and Candelaria rivers). 



Laguna del Ostion (09/19/92). The sampling site is located in front of La Barrilla, a small 



village about 15 km from downtown Coatzacoalcos. At this site, 2 replicate samples (Crassostrea 



virginica) were collected from two stations with the help of local residents. Access to the site is by 



boat. 



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



Bahia la Ventosa (09/20/92). This location has been added to the sampling program. Bahia 



Ventosa is located on the Pacific coast of the Isthmus of Tehuantepec, near Salina Cruz. Bivalves 



("Rock oysters"), attached to rocks at variable depths, were collected from 3 stations by local 



divers. Sampling stations are located within 500 meters from each other. Access to the sampling 



site is by boat. 



Contamination:: Petroleum -related activities. Navy base. 



Puerto Escondido (09/21/92). Puerto Escondido replaced Punta Maldonado on the original 



sample scheme. "Rock oysters" (C. corteziensis ) were collected with the help of local divers. 



Because of bad weather conditions, only one station, located near Zicatela beach in Puerto 



Escondido, was sampled. The sampling site can be accessed from the coast. 



Contamination:: No obvious sources of contamination were observed in the area other than 



domestic effluents from Puerto Escondido. 



Puerto Madero (09/22/92). Replicate samples of "Rock oysters" were collected from 1 station 



in front of the local light house. This site is located within the limits of Puerto Madero. 



Contamination:: Small port. Local fisheries. Banana fields. 



Tampico (09/26/92). Samples (Crassostrea virginica) were collected in the Pueblo Viejo Lagoon 



which is part of the Tamiahua Lagoon system. Access to the area is by car to La Puntilla, Colonia 



Morelos, and by boat to Congregacidn Anagua. This village is located on the margin of the 



Lagoon. Access to the site is by boat. Oysters are lying on a fairly soft bottom. 



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