Figure 4. - Vacuity index percentage by size-classes of five centi- metres. Length is fork length (cm). The number above each histogram correspond to the number of stomachs examined. Figure 3. - Vacuity index by seasons; in Great Cold Season (GCS), Low Cold Season (LCS), Great Dry Season (GDS) and Low Dry Season (LDS). The number above each histogram correspond to General profile of the diet the number of stomachs examined. A total of 12 families of teleost fish and invertebrates were found in the stomachs of Sphyraena guachancho The mean vacuity index was 59.7% but varied with season (Tab. I). Prey families were divided mainly into teleost fish (Fig. 3). It was significantly higher in GCS (71.3%) than in (9), cephalopods (2) and Malacostraca (1). It was noted LCS (48.9%; χ2 = 4.2896; df = 1, p = 0.038). In the GDS that these categories are ingested in different proportions and LDS, the vacuity percentages were similar (respec- throughout the size class and marine seasons. The main tively 53.7% and 54.9%). All size classes had close vacuity prey of S. guachancho were the clupeids Sardinella spp. index values ranging from 55 to 72.1%, with the exception (IRI = 22.5%) and Ethmalosa fimbriata (IRI = 18.8%) and of 49-54 cm size class which had the lowest index (33.3%; the cephalopod Teuthida spp. (IRI = 14.0%). Secondary prey Fig. 4). were the shrimp Penaeus spp. (IRI = 12.4%) and the carangid Trachurus trecae (IRI = 9.2%). Table I. - List of prey found in the stomachs of Sphyraena guachancho caught along the coast Sphyraena guachancho were also of Ivory Coast from June 2010 to July 2011 with their occurrence percentage (F%), numerical a substantial prey item through canpercentage (N%), weight percentage (W%), and index of relative importance (IRI%). nibalism (IRI = 7.8%).