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۱UV–B impacts on morphology and retina of Oncorhynchus mykiss larvae
نویسنده(ها): ، ،
اطلاعات انتشار: IRANIAN JOURNAL OF FISHERIES SCIENCES، سيزدهم،شماره۲، Apr ۲۰۱۴، سال
تعداد صفحات: ۱۴
The harmful effects of ultraviolet radiation on aquatic animals, due to ozone layer reduction, have been long studied in recent years. Exposure of Rainbow Trout larvae (Oncorhynchus mykiss) to Ultraviolet–B radiation (UV–B) at different doses (68.75 µw\cm2 and 94.83 µw\cm2 as the minimum and maximum dose of UV–B in natural environment respectively) for 15 minutes once a day in dark condition in comparison to control group (without any solar or UV) showed a wide variety of body abnormalities and eye damages. Body curvature, yolk sac edema, fin blistering, dwarfism, eye and head abnormalities as morphological malformations were revealed during the experiment, none of the malformations were observed in control group. Histopathological changes in retina such as irregular and discontinues pigmented epithelium, necrosis of photoreceptors and degeneration of nucleus layers confirmed the destructive effects of UV–B radiation in the eyes of Rainbow Trout. Such changes in larvae can be valid as bio–indicator for pollution and UV radiation and also introduce fishes as model for toxicological studies.

۲Evaluation of the effects of different concentrations of neutral anolyte on fungal infected eggs in rainbow trout (Oncorhynchus mykiss) in comparison with green malachite
اطلاعات انتشار: IRANIAN JOURNAL OF FISHERIES SCIENCES، پانزدهم،شماره۱، Jan ۲۰۱۶، سال
تعداد صفحات: ۹
The objective of this study was to determine the effect of different concentrations of anolyte on saprolegniasis in comparison with green malachite in rainbow trout hatcheries, in the northern part of Iran, Tonekabon. Nearly 5000 green eggs of Oncorhynchus mykiss (equivalent to 300 g) were obtained from a private farm in the north of Iran. The study was designed in 5 treatments, 0.25, 0.5, 25, 30 and 100 ppm of neutral anolyte and 2 ppm of green malachite and two controls including positive control, meaning that the green eggs were purposely infected with saprolegnia but without any disinfectant, and negative control, which was implied to as the untreated group, all in triplicate. There was no significant difference (α>0.05) in hatchability percent between 2 ppm of green malachite and the group treated with 0.25 ppm of neutral anolyte, contrary to other anolyte concentrations. It is concluded that constant use of 0.25 ppm of neutral electrolyzed oxidized water (NEOW) is a more effective anti–fungal solution with the least side effects in comparison with 2 ppm of green malachite.
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