Our study was focused on characterization of dominant Bacillus bacteria isolated from the digestive tract of Oncorhynchus mykiss. After 8 weeks, the fish fed with probiotic-free diet were dissected under strictly controlled conditions. Fish intestines were eviscerated and its content diluted to 10−4 using Ringer solution. Two isolated bacteria were Gram-positive, catalase-positive, and oxidase-...

Background: This study was conducted to investigate both the genotoxicity effects of M. officinalis aqueous extract on blood cells and the pathologic changes in the renal, cardiac and splenic tissues of Oncorhynchus mykiss. Methods: 300 fish (Oncorhynchus mykiss) were divided randomly into three groups (N=100 each), consisting of group, 1 (control), and groups 2 and 3 (experimental), which rec...

Fish sexual development is sensitive to exogenous hormone manipulation, and salmonids have been used extensively as environmental sentinels and models for biomedical research. We simulated maternal transfer of contaminants by microinjecting rainbow trout (Oncorhynchus mykiss) and chinook salmon (Oncorhynchus tshawytscha) embryos. Fish were reared for 6 months and sexed, and gonads were removed ...

This study was undertaken to investigate the effects of feeding rainbow trout (Oncorhynchus mykiss) broodstocks with different ratio of plant oils to evaluate the changes in antioxidant defense status in the progenies. In the experimental diets, fish oil was replaced with different combination of plant oils including corn oil, olive oil, sunflower oil, and coconut oil, to gain differen...

The effects dietary supplementation with Aloe vera extract (AE) on the immunity responses and hematological parameters of rainbow trout (Oncorhynchus mykiss) fry were evaluated in eight weeks trial. 600 rainbow trout (O. mykiss) fry with an average initial body weight of 13±0.05g were randomly allocated into two treatment groups including placebo-treated group (control) and A. vera extract-trea...

Background: Freezing is a common and ancient method for preservation of foods which is applicable both under household and industrial conditions. The objective of the study was to establish histological and microbiological changes in dorsal and abdominal muscles of rainbow trout (Oncorhynchus mykiss) after freezing once and twice. Methods: Forty-five fresh rainbow trout specimens were distribu...

The effects of DDT compounds on the function and viability of interrenal corticosteroidogenic tissue were investigated in vitro in rainbow trout (Oncorhynchus mykiss) in a dose–response study. The o,p9-dichlorodiphenyldichloroethane (DDD) was the most potent of the tested chemicals in decreasing adrenocorticotropic hormone (ACTH)-stimulated cortisol secretion by head kidney fragments compared w...