The effect of different colors of light on growth of Molly fish (Poecilia latipinna)

Document Type : Original Article

Authors

1 Department of fisheries, faculty of natural resources, University college of agriculture and natural resources, University of Tehran, Karaj

2 Department of fisheries, faculty of natural resources, Urmia University, Urmia

3 Department of fisheries, faculty of natural resources and marine sciences, Tarbiat Modares University, Nur

Abstract

Environmental factors can affect the growth and health of fish. The aim of this study was to demonstrate the effect of different colors of light on Molly fish (Poecilia latipinna) growth. In this regard, 84 fry Molly which were obtained from 10 male and 20 female adult fish, selected, and then accommodated in four different light treatments (white light, natural light , red light , blue light ). Each aquarium had three replicates and seven fishes randomly placed on each of them. A 40-watt flourcent lamp placed at 40 cm above the water surface on each aquarium (white, red, blue). Photoperiod consists of 12 h light and 12 h darknes. Larval feeding continued for 60 days and in addition to biometric testing in the first day, a final biometry had done on the last day. The results were evaluated by ANOVA analyses. Results showed that the larvae under white light had significant weight gain compared to the other treatments (P<0.05), blue and natural light did not show significant different from other treatments (P>0.05). At the end of the experiment the least gained weight and final length was observed on red treatment (P<0.05). The lowest growth rate observed on the red light treatment and showed significant differences with other treatments (P<0.05).

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