Villares Junior G A, Gomiero L M, Goitein R
Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista –UNESP, Rio Claro, SP, Brazil.
Braz J Biol. 2011 Aug;71(3):763-70. doi: 10.1590/s1519-69842011000400023.
Four biological aspects of Schizodon nasutus in the low Sorocaba river basin, São Paulo, Brazil were analysed. These were accomplished during the year seasons. The fish diet and the feeding activity were investigated by studying the repletion index, which showed no significant differences between seasons. The food items analysed by frequency of occurrence and dominance showed a predominance of vegetable items in the diet. The reproduction, analysed by using the gonadosomatic index, indicated that the reproductive period occurs during the summer period when temperatures are higher and rainfalls are more intense. The amount of accumulated fat and condition factor varied according to reproduction, especially for females.
对巴西圣保罗索罗卡巴河流域下游的纳氏裂齿脂鲤的四个生物学方面进行了分析。这些分析是在一年中的不同季节进行的。通过研究饱满指数对鱼类的饮食和摄食活动进行了调查，结果表明不同季节之间没有显著差异。按出现频率和优势度分析的食物种类显示，饮食中植物性食物占主导地位。通过使用性腺指数进行分析，繁殖表明繁殖期发生在夏季，此时温度较高且降雨更为强烈。累积脂肪量和肥满度根据繁殖情况而变化，尤其是雌性。
