Effect of Temperature and Photoperiod on Production and Morphometric Characters of a Freshwater Cladoceran, Ceriodaphniaquadrangula (O. F. Muller, 1785)

Khanjani, Mohammad Hossein; Farhadian, Omidvar; Keivany, Yazdan; Ebrahimi, Eisa

Effect of Temperature and Photoperiod on Production and Morphometric Characters of a Freshwater Cladoceran, Ceriodaphniaquadrangula (O. F. Muller, 1785)

Document Type : Original Manuscript

Authors

Mohammad Hossein Khanjani

Omidvar Farhadian

Yazdan Keivany

Eisa Ebrahimi

Abstract

The most important factors controlling cladocerans production, growth, and morphometric characters are temperature, food quantity and quality and photoperiod. Effects of temperature and photoperiod on production, and morphometric characters of cladoceran, Ceriodaphnia quadrangular, were examined by culturing on green algae Scenedesmus quadricauda in 250 ml conical flasks (150 ml water). Treatments used for temperature (^˚C)and photoperiod (light hours:dark hours) were 20,25,30 (^˚C) and 12:12,24:0 and 0:24, respectively. The maximum population density (5.51 ind./ml) obtained at 24:0 and 30 (^˚C), while maximum body length (731 µm) and maximum body width (491 µm) obtained at 0:24 and 20 (^˚C). Correspondingly, the maximum adult (61 %), maximum neonate (39 %) and young (9 %) in population under culture conditions of 0:24, 12:12,24:0 (L: D) and 20 (^˚C) obtained, respectively. Overall, this research showed that growth and reproduction of Ceriodaphniaquadrangula gave better performance at 25 (^˚C)and 24:0, light: dark photoperiod.