Paper Information

Journal:   IRANIAN SCIENTIFIC FISHERIES JOURNAL   FALL 2010 , Volume 19 , Number 3; Page(s) 97 To 106.
 
Paper: 

EFFECTS OF WATER HARDNESS AND TURBIDITY ON GROWTH AND FECUNDITY OF FRESHWATER CLADOCERAN, MOINA MACROCOPA (STRAUS, 1820)

 
 
Author(s):  FARHADIAN O.*, KHANJANI M.H., FARHADIAN A.A.
 
* FISHERIES DEPARTMENT, FACULTY OF NATURAL RESOURCES, ISFAHAN UNIVERSITY OF TECHNOLOGY, ISFAHAN, IRAN
 
Abstract: 

Water hardness and turbidity are important parameters in zooplankton culture, especially for Cladoceran affecting growth and reproductive parameters of the plankton. Effects of water hardness and turbidity on growth and fecundity of the Cladoceran, Moina macrocopa, was investigated by culturing and feeding them on green algae Scenedesmus quadricauda. Experimental treatments for hardness were 0, 20, 40 and 80mg/1 as CaCO3 and for turbidity were 0, 20, 40 and 80 NTU (Nephelometric Turbidity Unit). Experiments were carried out in 500ml flasks with initial density of 15 individuals per flask in randomized complete block design with three replicates. After 10 days, we found that M macrocopa, had the maximum population density (370.5-365.0 individuals per flask), maximum specific growth rate (SGR) (0.35/day), and the shortest population doubling time (Dt) (1.98 days) at 0 and 20mg/1 CaCO3, all with significant differences compared to other treatments (P<0.05). In contrast, we observed the maximum population density (296-325.5 individuals per flask) at turbidities of 0 and 20 NTU, maximum SGR (0.33/day) and the shortest Dt (2.10 days) at turbidity of o NTU, with significant differences compared to other treatments (P<0.05). The highest fecundity of M macrocopa was obtained at 20mg/1 as CaCO3 and turbidity of 0 NTU which significantly differed with other treatments (P<0.05). Overall, we showed that M macrocopa in freshwater with hardness less than 20mg/1 as CaCO3 and turbidity less than 20 NTU had better growth and fecundityperformance. The species can be used to evaluate habitats where water hardness and turbidity ishigher. Mass culture of the species based on its growth and reproduction under these optimal conditions could provide suitable zoo planktonic biomass for feeding of fish larvae.

 
Keyword(s): MOINA MACROCOPA, BREEDING, LIVE FOOD, SPECIFIC GROWTH RATE (SGR), WATER QUALITY
 
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