INTROPICA

29-37

Authors: Rafael García, Edmundo Mercado Silva

The objective of this study was to evaluate chilling susceptibility of Jícama (Pachyrhuzus erosus) cultivars, “San Miguelito” and “Vega de San Juan” stored at 10°C and 13°C. The plasma membrane from those cultivars were extracted and analyzed for phospholipids, fatty acids and a-Tocopherol. The ascorbic acid, was analyzed at tissue level, a-Tocopherol and ascorbic acid content decreased 71-79% and 46-29% in “San Miguelito”, and “Vega de San Juan” cultivars respectively. Phosphatydilcoline (PC) also decreased 32 and 71% in both cultivars. This results indicated that during cold storage, there were loss of membrane and oxidative stress because of incapability of tissue to regenerate a-Tocopherol and ascorbic acid.

57-61

Authors: Luis M Manjarrés, Jorge E. Viña Tous, Jose F Torres Hernandez, Alba R Vergara Castaño, German Rodriguez Páez, Jose L. Correa Daza

Within the framework of the fishing program Vecep (Inpa-Colombia) a pilot acoustic survey was carried out for the reconnaissance of bottoms and demersal resources, previous to the evaluation by the swept area method made by the same program. The survey was made in the strip between the outer limit of the artisanal fishing zone and the external edge of the continental shelf, and from Punta Gallinas to Cabo Tiburón, on the Colombian Caribbean. Some fishing operations with bottom long lines also took place, as well as oceanographic stations in all the wurveyed area. Although some resultos of interest were disclosed to the businessmen in the fishing sector through a technical bulletin and a workshop, the main results had not yet been formally published. The present work rescues the most important aspects from the fishing and oceanographic point of view, making emphasis on the environmental conditions in the sites where groupers and snappers were caught

75-83

Authors: Luz Adriana Velasco, Francisco Borrero

Spat collection and growth experiments were carried out between September/1994 and November/1995 with the purpose of determining the biological and technical feasibility of culturing the pen shell Pinna carnea (Mollusca:Bivalvia) in the Santa Marta region. A total of 125 seeds/Collector was obtained using artificial collectors of the <> type held in the water for 10 weeks at 4 and 10 m of depth. The seeds obtained were cultured on held at 9m and at two densities, 10 and 20% of the net bottom coverage. Shell growth, survival, and number of predators per pearl net were assessed monthly, along with data on water temperature, salinity, and concentrations of total (MPT) and organic (MOP) seston. After 11 months of culture, the bivalves attained average lengths of 167.5 and 156.5 mm at densities of 10 and 20% respectively. No significant differences in growth or survival were detected between treatments. Significant negative correlations were found between growth rates, their size (length) and water temperature, and positive with salinity and MOP in the water. Mortality of P. carnea was positively and significantly correlated with the number and sizes of both cymatid gastropods and crabs (portunid and xantid). The pen shell has positive features for culture in the area: the seed is relatively abundant and essay to collect, size and growth rate are high and despite early survival is depleted by predators, its vulnerability is low once the shells attain 100mm in length

91-103

Authors: German Bula-Meyer

An account is made on the use of marine macroalgae in agronom and the potential that floating Sargassum arriving to San Andres and Providencia has for this activity. This Sargassum, wixh has been a nulsance for the tourist economy of the islands, promises to be an excellent resource for manure production.