Pacheco-Almanzar Eloísa, Simons James, Espinosa-Pérez Héctor, Chiappa-Carrara Xavier, Ibáñez Ana L
Departamento de Hidrobiología, Universidad Autónoma Metropolitana-Iztapalapa. Av San Rafael Atlixco 186, Col. Vicentina. México, D.F. 09340 México.; Email:
Center for Coastal Studies, Texas A&M University-Corpus Christi, 6300. Ocean Drive, Corpus Christi, Texas 78412.; Email: unknown.
Zootaxa. 2016 May 9;4109(3):381-90. doi: 10.11646/zootaxa.4109.3.8.
Menezes et al. (2010) show that Mugil cephalus Linnaeus, 1758 is different from Mugil liza Valenciennes 1836, the latter being the mullet found along the Atlantic coast of South America. They also suggest that individuals identified as M. cephalus from the northwest Atlantic could represent a population of M. liza in this region, since they doubt the presence of M. cephalus in waters colder than the ones of the West Indies. In order to clarify the presence of M. cephalus in the northwest Atlantic, this study compares meristic and morphometric measurements of M. cephalus and M. liza from the Gulf of Mexico with those obtained by Menezes et al. (2010) for M. liza from South America and for M. cephalus in the Mediterranean Sea. Results show that there are differences in both morphometric and meristic data between the two species. The morphometric measure that differentiates these species is the distance from the snout to the dorsal fin, which is positioned backwards in M. liza compared with M. cephalus. The body width is consistently greater in M. cephalus than M. liza. The meristic character that discriminates between both species is the number of scales in the longitudinal series that, in M. cephalus, ranges from 38 to 43 while in M. liza between 32 to 39. The information presented in this work confirms the presence of M. cephalus in the Gulf of Mexico and the sympatric presence of M. liza is established, even if its abundance is quite low.
梅内塞斯等人（2010年）表明，1758年的鲻鱼（Mugil cephalus Linnaeus）与1836年的瓦氏鲻（Mugil liza Valenciennes）不同，后者是在南美洲大西洋沿岸发现的鲻鱼。他们还指出，从西北大西洋鉴定为鲻鱼的个体可能代表该地区的瓦氏鲻种群，因为他们怀疑在比西印度群岛水域更冷的海域中存在鲻鱼。为了弄清楚西北大西洋是否存在鲻鱼，本研究将墨西哥湾的鲻鱼和瓦氏鲻的分节特征及形态测量数据与梅内塞斯等人（2010年）获取的南美洲瓦氏鲻和地中海鲻鱼的数据进行了比较。结果表明，这两个物种在形态测量和分节数据上都存在差异。区分这两个物种的形态测量指标是从吻部到背鳍的距离，与鲻鱼相比，瓦氏鲻的背鳍位置更靠后。鲻鱼的体宽始终大于瓦氏鲻。区分这两个物种的分节特征是纵向鳞片列的数量，鲻鱼的纵向鳞片列数量在38至43之间，而瓦氏鲻在32至39之间。本研究提供的信息证实了墨西哥湾存在鲻鱼，并且确定了瓦氏鲻与之同域存在，尽管其数量相当少。
