Impacto arrozais na dieta de juvenis de dourado Salminus brasiliensis (actinopterygill:characiformes)

Abstract

This work is based on identifying the golden youth of habit (Salminusbrasiliensis) and analyzes the impact of rice on the juveniles of this species. The study was conducted in February 2015 in a rice crop located in the basin of the Middle Uruguay (San Borja / RS). The fish capture was performed by using seine hauls of 2.0 m long and 2.0 mm screen. The collected fish were cataloged and set in a 10.0% formaldehyde. Each specimen was obtained the total length (cm) Total weight and stomach weight (g). They Were captured a total of 30 fish with lengths varying between 80 and 223 mm. Were the fish divided into four size classes: Class 1 = less than 100 mm; Class 2 = 100- 150 mm; Class 3 = 150-200 mm; Class 4 = greater than 200 mm.Os Were stomachs removed and fixed in 4.0% formaldehyde, Analyzed by frequency of occurrence method and plenty of .or condition specific item was .O Condition was Also factor used .In general, the golden Showed Increased consumption of fish items Followed by insect and plant materials item, the item was sediment Also found in the stomach contents. When Analyzed the diet of different size classes Were Observed what classes 1 and 2 Showed the specialization by the item fish and Grade 3 and 4 Showed the loss of this specialization due to Increased insect and plant equipment items. When Evaluated the condition factor was found queAmong the four classes, the class 3:04 Showed a significant drop in expected weight. We conclude que the golden juvenile Salminus brasiliensis is Mainly specialized in carnivorous fish consumption. The impact of rice in the species was verified through a change in the consumption of food items and reduced physiological quality.