The examination of Tanon replacement to Clay in artificial propagation process of Beluga (Huso huso)
Subject Areas : New Technologies in Aquaculture Development
Keywords: clay, Huso huso, Beluga, Keywords: Tanon,
Abstract :
Abstract Beluga (Huso huso) is the biggest sturgeon fish in Caspian Sea. Artificial propagation of Beluga has significantly emerged in recent years due to the prolonged maturation age and destroied breeding grounds .One of the artificial propagation stage is removing egg adhesiveness by using clay suspension. It can be done by utilizing some water to make 10 percent clay suspension, and washing the fertilized eggs for 30- 45 minutes to remove the adhesiveness. This process is time-taking while Tanoan can be a good replacement for it. 3 brooder females of Beluga used in propagation season 2008. After breeding and artificial propagation, each brood stock divided into 8 portions: treatment (0.625gr Tanon in 1.25 liter water) and control (10 percent clay suspension) ; each group was washed with 4 replicate. According to the results, washing time for Tanoan is 1 minute and 30 seconds but for clay is 45 minute. The fertilization rate in washed eggs in Gastrula stage by Tanoan and clay suspension are 78.7 and 71.6 percent respectively. Fungal infected percent are 3.40 and 8.70 respectively, hatching rate 77.32 and 69.57, and larvae survival rates to yolk sac resumption are 96.39 and 92.38 respectively. The replacement of Tanoan would save time and could reduce the possible expenses in the process and also a few number of fertilize eggs re-exposed to the possible threat of being damaged. It will also increase the larvae survival rates in propagation.
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