Appendix E: Field Scientist Report 



4th IMW Sampling Mission: Colombia, Venezuela, Trinidad and Aruba 



Bivalve samples from 9 sites in Colombia, Venezuela, Trinidad and Aruba were collected 

 between February 9 and February 26, 1992. In Colombia, samples were collected in 3 of 4 pre- 

 selected sites (Cartagena, Santa Marta and Tumaco). No samples were collected from 

 Buenaventura. In Venezuela, samples were collected from 3 sites: Paparo, Morrocoy National 

 Park and Cumana. No samples were collected in Maracaibo (depleted population) or from the 

 Curiapo site located on the margins of the Orinoco river delta (no local contact). Sampling in the 

 Trinidad and Tobago area were carried out near Port of Spain and at the southeast extreme of 

 Trinidad. The last sampling site is facing the delta of the Orinoco river and replaces the Curiapo 

 site in Venezuela Samples in Aruba were collected in the vicinity of the port. Sampling details are 

 similar to the previous missions. 



On February 18, personnel of CICA at the University of Costa Rica, collected samples in 

 Tortugueros, located on the Caribbean coast of Costa Rica. This site replaced Limon. 

 COLOMBIA 



Cartagena Bay (02/11/92). Known oyster beds have been mostly depleted in Cartagena Bay. 

 Duplicate samples {Crassostrea rizhophorae) were collected from two sites in Cartagena Bay. One, 

 Cienaga de los Vazquez, is a fairly enclosed area located outside Cartagena Bay, near Boca 

 Chica.. A second site (Isla Tierra Bomba) is located inside Cartagena Bay. Access to the sites 

 is by boat. 



Contamination:: No sources of contamination were observed in Cienaga de los Vazquez. 

 Domestic and industrial effluents, port and marine transit might be significant sources of 

 contamination to the second site. 



Santa Marta (02/12/92). Cienaga is located about 195 km from Cartagena. Cienaga Grande is 

 located about 10 km from Cienaga. Three stations were sampled. Depending on the station, 

 oysters (Crassostrea rizhophorae) were lying on hard bottom, attached to the roots of mangroves 

 or attached to rocks on the coast. Access to the sampling sites was by boat 

 Contamination:: No sources of contamination were observed other than small villages on the 

 coast. Water circulation is very restricted. 



Tumaco (02/14/92). Duplicate samples (Anadara tuberculosa and Anadara similis) were collected 

 from three stations in the Tumaco area with the help of local people. Access to the sampling sites 

 was by boat. 



Contamination:: Domestic effluents. 

 VENEZUELA 



Paparo (02/17/92). Paparo is located about 160 km from Caracas. Samples were collected from 

 3 stations located to the east of the Tuy river. The first station is located just to the east of the 

 mouth of the river. The second and third stations are about 500 and 1000 meters to the east from 



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