Billfishes are large highly migratory fish species found in all the world’s oceans. Several studies have been developed to understand how oceanographic and environmental variables influence marine species distribution, but little information exists about the size distribution of these important species. The main goal of this research was to describe the environmental conditions driving segregation by size of six billfish species on the eastern Pacific Ocean (EPO). Generalized Additive Models (GAMs) were used to describe the effect of environmental factors on the size of billfish species bycaught by the tuna purse-seine fishery in the EPO. Results suggest some or high degree of segregation of the billfishes related to its size and driven by environmental preferences. For striped marlin, black marlin, and blue marlin larger individuals are present at the south of 5 °N, where colder and highly productive waters are present while, smaller sailfish were present in warmer and productive areas located at north of 5 °N. These results may be useful to conduct further studies to detect nursery, reproduction or feeding areas of billfishes in both coastal and oceanic waters.

fish鱼是在世界所有海洋中发现的高度迁徙的大型鱼类。已经开展了一些研究来了解海洋和环境变量如何影响海洋物种的分布，但是关于这些重要物种的大小分布的信息很少。这项研究的主要目的是根据东太平洋（EPO）上6种bill鱼物种的大小描述驱动隔离的环境条件。在欧洲专利局，金枪鱼围网捕捞中使用广义附加模型（GAM）描述环境因素对金枪鱼围网捕捞所产生的比目鱼物种大小的影响。结果表明，在一定程度上或高度隔离了河豚的分离，这与河豚的大小有关，并且受环境偏好的影响。对于条纹马林鱼，黑色马林鱼，在5°N的南部，有蓝色马林鱼个体较大，那里有较冷和高产水域，而在5°N北部的较温暖和高产地区则有较小的旗鱼。这些结果可能有助于进行进一步的研究，以检测沿海和海洋水域的河豚的繁殖，繁殖或觅食区域。