Effects of enriched daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon (Acipenser persicus) larvae

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Abstract

Microalgae as a source of valuable compounds such as fatty acids are isolated from the
natural environments and their mass production with high nutritional value is one the
necessities of many hatcheries. The present study aimed to determine the effects of enriched
daphnia with microscopic algae on some growth indices and survival rate of Persian sturgeon
(Acipenser persicus) larvae. Chlorella vulgaris and Scenedesmus dimorphus were purified
and cultured. Then, Daphnia longispina was fed microalgae including Chlorella vulgaris and
Scenedesmus dimorphus enriched with Docosahexaenoic acid (DHA). The microalgae density
to enrich daphnia was estimated at 5× 107 cells mL-1. Three treatments with three replicates
and a control group were considered in this study. A total of 30 Acipenser persicus larvae
were allocated to each sixty liters tank. Experimental fish were fed daphnia enriched with
Chlorella vulgaris (treatment 1), daphnia enriched with Scenedesmus dimorphus (treatment 2)
and daphnia enriched with Chlorella vulgaris and Scenedesmus dimorphus (at the rates of
50%) (treatment 3). Persian sturgeon larvae in the control group were fed like VNIRO stage
from daphnia caught in pond. Larvae were fed 30% of body weight per day for four times.
During the experimental period, water temperature, dissolved oxygen concentration and pH
ranged between 18-24°C, 5.8-7.2 mg l-1 and 5.6-8.2, respectively. The minimum (219 ± 98.4
mg) and maximum (315.16 ± 140.8 mg) mean (±SD) weights were observed in the control
group and treatment 3, respectively. The results obtained from the body weight increase (BWI
%) revealed that there were significant differences between treatment 3 and other treatments.
Highest (4.6±1.13% day-1) and lowest (5.5±1.24% day-1) mean (±SD) specific growth rates
(SGR) were recorded in fish fed the control group and treatment 3, respectively. Lowest
(68%) and highest (85%) survival rates were recorded in the control group and treatment 3,

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Iranian Scientific Fisheries Journal
Volume 22, Issue 2 - Serial Number 83
November and December 2013
Pages 47-54

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