The effect of walnut''s green skin on coloration of Oscar fish (Astronotus ocellatus)

Subject Areas : Marine Biology

M.  Abbasi Oghda ¹ (Dept. of Fisheries, Faculty of Marine Science and Technology, Islamic Azad University, Tehran North Branch)
A.  Vosooghi ² (Dept. of Fisheries, Faculty of Marine Science and Technology, Islamic Azad University, Tehran North Branch)
A.  Matinfar ³ (Iranian Fisheries Science Research Institute, Tehran)

Received: 2016-02-17 Accepted : 2016-06-07 Published : 2016-06-20

Keywords: Diet, Oscar fish (Astronotus ocellatus), Walnut’s green skin, coloration,

Abstract :

The effect of oral green skin of walnuts on the coloration of Oscar fish (Astronotus ocellatus) was studied. Albino Oscar fish with an average weight of 60 grams 5/01 ± 0/18 and 54/84 ± 2/23 mm average length in the form of 3 experimental and one control and each with three repetitions were divided. Twelve aquariums with dimensions of 50 × 40 × 33 cm was used. Control was fed with no food additives (food stand). For the first treatment food containing 0.1 percent walnut hull was used, 0.2 percent was used for the second treatment with the diet and in the third treatment fish were fed with food containing 0.3 percent walnut hull. The breeding period lasted 8 weeks (56 days). Every 20 days biometrics (Biometry) was carried out. Average water temperature in the aquarium during the study period was 28.07 ± 1.09 °C, with an average of 5.38 ± 0.15 milligrams per liter of dissolved oxygen, average pH was measured to be 8.03 ± 0.33 and average TDS,  33.27 ± 1.32 mg. After the breeding period, 3 fish from each treatment were randomly selected to assess the rate of change of color obtained using L* a* b* colorimetric system using a CHROMA METER CR-40. Colorimetric analysis of fish skin from treatments showed that oral administration of green walnut caused significant skin discoloration. Component b* ​​representing the yellow color, was positive in the treatment 1, showed significant differencecompared to control (P0/05). The results showed that using the green skin of walnuts in the diet can increase the Oscar fish skin color towards yellow. It was shown that the level of 0.1 percent green skin of walnuts in the diet was the best level for increasing  the yellow color in fish were detected.

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