Document Type : Research Paper
Authors
1
PhD Student of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
2
Associate Professor, Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
3
Assistant Professor, Department of Fisheries, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran
4
Assistant Professor, Department of Fisheries, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran
Abstract
High mortality rates in embryonic and larval stages of rainbow trout in Iran are believed to be associated with incubation stressors such as handling. In the present study, the effects of handling stress on hatching, survival rate, growth performance, proximate composition and fatty acid profiles in rainbow trout were assessed. The fertilized eggs were subjected to handling for 10 min submerged in a 12 °C, aerated water bath, 10 min after fertilization. Untreated fertilized eggs were used as controls. The handling stress caused decreased survival of eggs during the incubation period (p<0.05). Also, the handling induced changes in weight gain, protein and ash contents, and fatty acids profile of descended fry (p<0.05). Of saturated fatty acids, levels of palmitic acid (C16:0) and palmitoleic acid (C16:1) were significantly increased in treatment group (p<0.05). In addition, levels of omega-6 fatty acids such as arachidonic acid (C20:4n-6), linoleic acid (C18:2n-6) and gamma-linoleic acid (C18:3n-6) were significantly increased in fish as an effect of handling. The results showed that the levels of saturated fatty acids increased and the levels of unsaturated fatty acids decreased as an effect of manipulation of fertilized eggs, indicating that handling affects the quality and nutritional value of fish.
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