. Bulletin - Southern California Academy of Sciences. Science. 42 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 4. (A) Dorsal cephalic views of blue catfish for southern specimen (left) and northern (right). Lateral cephalic views of southern specimen (B) and northern specimen (C). Photographs by Gorgonio Ruiz-Campos. Luis Potosi) had a lower number of anal rays (mean = 22) when compared with southern specimens of Chiapas (mean = 26). In spite of the range and average of length for both species examined being statistically similar, we expect that the variation of each character compared will d
. Bulletin - Southern California Academy of Sciences. Science. 42 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 4. (A) Dorsal cephalic views of blue catfish for southern specimen (left) and northern (right). Lateral cephalic views of southern specimen (B) and northern specimen (C). Photographs by Gorgonio Ruiz-Campos. Luis Potosi) had a lower number of anal rays (mean = 22) when compared with southern specimens of Chiapas (mean = 26). In spite of the range and average of length for both species examined being statistically similar, we expect that the variation of each character compared will decrease as the sample size increases. We suggest that a larger sample size for each southern and northern group, including intermediate populations, as well as a detailed study on the osteology and molecular genetic analysis should be conducted to evaluate the taxonomic status of the southern form "lctalurus meridionalis" Acknowledgements We thank C. Ramirez Martinez, responsible of the project "Ordenamiento de la actividad pesquera en la ribera del Rio Lacantun de la Reserva de la Biosfera de Montes Azules". Our thanks to Contreras-Balderas for helping us in the field work and an early review of the manuscript. A. Z. Guerrero, J. M. Leza, D. L. Romero, A. A. Macossay, G. Lara, J. H. Lozano, M. Villalobos, G. Mendez, C. Chankayub, and R. Lombera for their help in the sampling and field work. Two anonymous reviewers and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles : Southern California Academy of Sciences
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