Petrere M, Walter T, Minte-Vera C V
Departamento de Ecologia, UNESP, Rio Claro, SP, Brazil.
Braz J Biol. 2006 Aug;66(3):817-28. doi: 10.1590/s1519-69842006000500007.
The income of small-scale fisheries of two urban reservoirs in Brazil: Represa Billings (127 km2) located in the metropolitan region of São Paulo, the capital city of the state of São Paulo and Lago Paranoá (38 km2) located in Brasília (DF), the capital city of Brazil were calculated and compared. Both fisheries are mainly based on the alien Nile tilapia Oreochromis niloticus (more than 80% of the total catch). Although these reservoirs are nearly 900 km apart, their native fish fauna belong to the Upper Paraná Province. The Represa Billings fishers have, on average, a daily profit of 15.8 R dollars (8.4 U dollars mostly employing gill nets) and Lago Paranoá fishers 46.6 R dollars (24.9 U dollars, mostly employing cast nets), which is a statistically significant difference (P < 0.001). The profit of the fisheries is explained by the factor "reservoir" and covariate "days of fishing". Due to the increasing violence in the metropolitan region of São Paulo, the Represa Billings fishery is vanishing.
对巴西两座城市水库的小规模渔业收入进行了计算和比较，这两座水库分别是位于圣保罗州首府圣保罗市大都市区的比林斯水库（面积127平方公里）和位于巴西首都巴西利亚（联邦区）的帕拉诺阿湖（面积38平方公里）。这两个渔场主要以外来的尼罗罗非鱼为主（占总渔获量的80%以上）。尽管这两座水库相距近900公里，但它们的本地鱼类区系都属于上巴拉那省。比林斯水库的渔民平均日利润为15.8雷亚尔（8.4美元，主要使用刺网），帕拉诺阿湖的渔民平均日利润为46.6雷亚尔（24.9美元，主要使用撒网），这在统计学上有显著差异（P<0.001）。渔场的利润可由“水库”因素和协变量“捕鱼天数”来解释。由于圣保罗大都市区暴力事件不断增加，比林斯水库渔场正在消失。
