Abstract
Individuals of its own genus were the main food item of two species of tucunares (Cichla cf. ocellaris and Cichla monoculus) introduced into the Volta Grande Reservoir. The abundance of adult tucunares may cause intra-specific competition, possibly leading to the high cannibalism rates found.
Highlights
The Volta Grande Reservoir, on the Rio Grande River, is located in São Paulo and Minas Gerais states (48o25’ and 47o35’W, 19o57’ and 20o10’S)
We examined 76 stomachs of C. cf. ocellaris and 18 of C. monoculus
The relative importance index (RII) of the items Cichla sp., P. squamosissimus, and T. rendalli indicated that Cichla sp. was the main prey of both species (Figs. 2 and 3)
Summary
The Volta Grande Reservoir, on the Rio Grande River, is located in São Paulo and Minas Gerais states (48o25’ and 47o35’W, 19o57’ and 20o10’S). The reservoir, with an area of 221.7 km and a water volume of 2,268 km, is used to produce electric energy. The climate is typically tropical with a mean annual temperature of 22°C and mean annual rainfall of 1,635 mm. The two seasonal periods are: warm and rainy from October to April, and cool and dry from May to September (Braga & Gomiero, 1997). The reservoir has a large abundance of tucunares, Cichla spp. Bloch & Schneider, 1801, a fish from the Amazon basin with marked caudal ocellus
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