International Science Community Association International Research Journal of Biological Sciences 2278 - 3202 1 2 2012 June 10 Sexual Dimorphism in Body Shape of Hypseleotris Agilis (Herre, 1927) from Lake Lanao, Philippines 25 31 EN Muhammad Jamshed Khan 1 Faculty of Veterinary Sciences, Bahauddin Zakariya University, Multan, PAKISTAN Asad Abbas 2 University of Salmanca, SPAIN Mazhar Ayaz 3 Faculty of Veterinary Sciences, Bahauddin Zakariya University, Multan, PAKISTAN Naeem Muhammad 4 Institute of Applied and Pure Biology, Bahauddin Zakariya University, Multan, PAKISTAN Saleem Qadir 5 University of Agriculture, Faisalabad, PAKISTAN Muhammad Saleem Akhter 6 Faculty of Veterinary Sciences, Bahauddin Zakariya University, Multan, PAKISTAN Zia Waseem 7 Livestock and Dairy department, Government of Punjab, PAKISTAN P. Muthusamy 1 Department of Biotechnology, Karunya University,Tamil Nadu, INDIA S. Murugan 2 Department of Biotechnology, Karunya University,Tamil Nadu, INDIA Smitha Manothi 3 Department of Biotechnology, Karunya University,Tamil Nadu, INDIA Nishi K. 1 Department of Biology and Environmental Sciences, CSK Himachal Pradesh Krishi Vishwavidyalaya, Palampur, Himachal Pradesh, INDIA N.K. Gupta 2 Department of Biology and Environmental Sciences, CSK Himachal Pradesh Krishi Vishwavidyalaya, Palampur, Himachal Pradesh, INDIA S.C. Sharma 3 Department of Biology and Environmental Sciences, CSK Himachal Pradesh Krishi Vishwavidyalaya, Palampur, Himachal Pradesh, INDIA Kumar Praveen G.N. 1 Department of Biotechnology, Acharya Institute of Technology, Soladevanahalli, Bangalore-560 090, INDIA Sumangala K. Bhat 2 Department of Biotechnology, Acharya Institute of Technology, Soladevanahalli, Bangalore-560 090, INDIA Nacua Sherwin S. 1 Biology Department, Mindanao State University, Marawi City, PHILIPPINES Torres Mark Anthony J. 2 Department of Biological Sciences, MSU-Iligan Institute of Technology, 9200 Iligan City, PHILIPPINES Cesar G. Demayo 3 Department of Biological Sciences, MSU-Iligan Institute of Technology, 9200 Iligan City, PHILIPPINES > Research Paper 2012 5 18 2012 June 10 H. agilis is an endemic species of fish from Lake Mai-init, Surigao del Norte, and introduce to Lake Lanao of Lanao del Sur sometime in the 1960s. The principal objective of this study is to describe the variations in morphology of the species as well as determine its sexually dimorphic traits, using landmark-based geometric morphometrics. A total of 55 (25 females and 30 males) specimens were analyzed. Twenty landmark points were digitized from which relative warp score were derived. Discriminant function analysis and thin-plate spline plot showed significant difference between body shape of the sexes with males exhibiting bigger head, along with elongated dorsal and anal fin bases. The bigger head of males relative to females could be a result of sexual selection, whereas, the elongated dorsal and anal fins could be a product of ecological/niche selection. Copyright@ International Science Community Association