Peña-Mendoza B, Gómez-Márquez J L, Salgado-Ugarte I H, Ramirez-Noguera D
Laboratorio de Limnología, F.E.S. Zaragoza, U.N.A.M. Av. 5 de Mayo y Fuerte de Loreto, Col. Ejército de Oriente, lztapalapa. C.P. 09230, México, D.F.
Rev Biol Trop. 2005 Sep-Dec;53(3-4):515-22. doi: 10.15517/rbt.v53i3-4.14666.
The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (chi(2)=10.26; p<0.05). The tilapia reached maturity at 151.3 mm (females) and 152.0 mm (males) of total length. Rainy (August) and dry (February) seasons were determined as the breeding period. Fecundity variation was better correlated with length (r=0.7473: p<0.002) than with weight (r=0.7395; p<0.002). The fecundity ranged between 243 and 847 oocytes per fish, with egg diameter from 300 to 3 700 microm. Intensive breeding activity in August and February coincide with phytoplankton biomass increase.
通过在墨西哥莫雷洛斯州埃米利亚诺·萨帕塔大坝每月采样，对罗非鱼的繁殖季节进行了研究。从1999年2月到2000年2月，从商业捕捞（刺网，网眼尺寸6.5厘米）中采集了50条鱼的样本。观察到的性别比为1:1.29（雌性:雄性）（卡方值=10.26；p<0.05）。罗非鱼在全长151.3毫米（雌性）和152.0毫米（雄性）时达到成熟。雨季（8月）和旱季（2月）被确定为繁殖期。繁殖力变化与体长的相关性（r=0.7473；p<0.002）优于与体重的相关性（r=0.7395；p<0.002）。每条鱼的繁殖力在243至847个卵母细胞之间，卵直径为300至3700微米。8月和2月的密集繁殖活动与浮游植物生物量增加相吻合。
