Life history traits of Aphanius ginaonis Holly, 1929 (Cyprinodontidae) and potential risks of extinction in the Geno hot spring (Iran) population

Abstract

This study presents some traits of the Aphanius ginaonis life history in the Geno hot spring and explains the potential risks of its extinction. Sampling was from March 2009 to February 2010. A total of 61 males and 71 females were measured (total length) and weighed, with data on reproductive biometry also taken. Growth parameters were determined in addition to weight-length relationships: W (t) = 0.012TL 3.42 , R 2 = 0.96 for females and W (t) = 0.0101TL 3.38 , R 2 = 0.94 for males. A. ginaonis females showed an asymptotic total length (TL ¥ ) of 53.03 mm; the growth coefficient, K (year )1 ) 0.15, t 0 (year) 1.01; and natural mortality coefficient M (year )1 ) 0.62. In males the value for TL ¥ was 48.83 mm; for K (year )1 ) 0.2, t 0 (year) 0.44; and M (year )1 ) 0.49. The relationship between absolute fecundity and fish size (total length, body weight or age) showed a strong correlation to body weight. The A. ginaonis population is threatened with extinction -and a co-management in cooperation with the local population for strong protection measures is urgently needed.

Life-history traits of Aphanius danfordii (Boulenger, 1890) (Pisces: Cyprinodontidae), endemic to Kızılırmak Basin (Turkey)

“…The maximum age of Aphanius species varies between 2+ and 7+ (Leonardos and Sinis, 1999;Keivany and Soofiany, 2004;Gu¨c¸lu¨et al, 2007;Kamal et al, 2009;Oliva-Paterna et al, 2010;Golmoradizadeh et al, 2011), and longevity of the A. danfordii can be as much as five years in the Hirfanli Reservoir. The sex ratio found in this study is also similar to those found in many studies conducted on Aphanius (Leonardos and Sinis, 1999;Gu¨c¸lu¨and Ku¨c¸u¨k, 2008;Kamal et al, 2009;Oliva-Paterna et al, 2010;Golmoradizadeh et al, 2011). As in many of the studies, females were dominant in the present study.…”

Sexual dimorphism of vertical bar patterning in the South European toothcarp Aphanius fasciatus

“…1). Sexual size dimorphism is well known in this genus, with females attaining a larger size than males (Gandolfi et al ., 1991;Leonardos & Sinis, 1999;Doadrio et al ., 2002;Golmoradizadeh et al ., 2012). The breeding system is based on an intense male-male competition for the access of single females, which are led to spawn on algal mops or other substrata (Gandolfi et al ., 1991;Malavasi et al ., 2010).…”