Arellano-Torres Andrés, Hernández Montaño Daniel, Meléndez Galicia Carlos
Centro Regional de Investigación Pesquera-Patzcuaro, Instituto Nacional de Pesca-SAGARPA, Calzada Ibarra No. 28, Col. Ibarra, Pátzcuaro, Michoacán, C. P. 61609, México.
Rev Biol Trop. 2013 Sep;61(3):1301-12.
A comparative analysis of three length based methods for estimating growth of the tilapia Oreochromis aureus (Perciformes: Cichlidae) in a tropical lake of Mexico. Several methods are now available to estimate fish individual growth based upon the distribution of body lengths in a population. Comparative analyses of length-based methods have been undertaken mainly for marine species; nevertheless, limited information is available for inland species. Tilapia is one of the most important freshwater fisheries and its growth parameters have been estimated by several authors, usually using one length-based method. Thus, the main objectives of this study were: a) to estimate growth parameters of O. aureus from Chapala lake, Mexico, using three length-based methods ELEFAN, PROJMAT and SLCA; b) to quantify the effect of input data variations in growth parameters estimates by the jackknife technique; and c) to compare the new estimates with those previously reported, through the standard growth index phi. We collected and analyzed a total of 1,973 specimens from commercial landings from January to December 2010. The three length-base methods used in the present study resulted in parameter estimates within the range of those reported in other studies. Results derived from jackknife analysis revealed lowest values in the error percentage and coefficient of variation for L infinity when applying ELEFAN, while PROJMAT showed lowest values in the precision estimators for K, which was very similar to ELEFAN. Estimates of the comparative growth index phi were also very similar to those reported for the same species when studied in different reservoirs. Considering our results, we suggest the use of ELEFAN rather than SLCA due to its accuracy to estimate growth parameters for O. aureus.
墨西哥热带湖泊中基于三种体长法对奥利亚罗非鱼（鲈形目：丽鱼科）生长情况的比较分析。目前有多种方法可根据鱼群中体长分布来估算鱼类个体生长情况。基于体长法的比较分析主要针对海洋物种开展；然而，关于内陆物种的此类信息有限。罗非鱼是最重要的淡水渔业品种之一，已有多位作者估算过其生长参数，通常采用一种基于体长的方法。因此，本研究的主要目标是：a）使用ELEFAN、PROJMAT和SLCA这三种基于体长的方法，估算墨西哥查帕拉湖奥利亚罗非鱼的生长参数；b）通过留一法技术量化输入数据变化对生长参数估算的影响；c）通过标准生长指数φ，将新的估算值与先前报告的值进行比较。我们于2010年1月至12月从商业捕捞上岸的鱼中总共收集并分析了1973个样本。本研究中使用的三种基于体长的方法得出的参数估算值在其他研究报告的范围内。留一法分析结果显示，应用ELEFAN时，L无穷大的误差百分比和变异系数最低，而PROJMAT在K的精度估计值方面显示出最低值，这与ELEFAN非常相似。在不同水库对同一物种进行研究时，比较生长指数φ的估算值也与先前报告的非常相似。考虑到我们的结果，由于ELEFAN在估算奥利亚罗非鱼生长参数方面的准确性，我们建议使用ELEFAN而非SLCA。
