We studied some aspects of the biology of the Zagros tooth-carp, Aphanius vladykovi, an endemic and poorly known species from Chahar-Mahall-va-Bakhtiari province in central Iran, by regular monthly collections and direct observation in aquaria during a full year. Individuals from Modar-Dokhtar spring of Gandoman region were collected; some were preserved in formalin and some were transferred to aquaria alive. Standard biometric and biological measurements were carried out. The stomach content consisted mostly of freshwater crustacean and the RLG was 0.7, on average, suggesting a carnivorous habit. The eggs had an average diameter of 1 mm (±0.1) and the average absolute and relative fecundity was 415 (±169) and 110 (±25), respectively. The gonadosomatic ratio and ovary condition suggested that the reproductive season of the species was between late March and June with a peak in early April. The species is euryhaline and eurythermal and prefers neutral to basic waters. It is usually found in well-oxygenated waters, but is tolerant to hypoxia as well.
کلید واژگان :fish biology, gonadosomatic index, Middle East, pupfishes, reproduction
ارزش ریالی : 1200000 ریال
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