ABSTRACT
Nucleotides as low molecular weight intracellular compounds play key roles in diverse physiological and biochemical functions including encoding genetic information and mediating energy metabolism. To determine effects of different levels of dietary nucleotides [NT] on fatty acid profile in rainbow trout. This experiment was carried out in 700 L circular tanks with 40 fish per tank. NT was added to the diet at a rate of 0.0, 0.05, 0.1, 0.15 and 0.2 percent. Fish with average weight of 11.35 +/- 0.32 g were fed 5 times a day [3-5% of body weight] over 8 weeks. After 56 days of feeding, Eicosapentaenoic acid and Linolenic acid levels increased in fish fed on 0.2% NT compared to the control group. No significant difference [p>0.05] was in polyunsaturated fatty acids [PUFA], n-3, n-6, n3/n6 and saturated fatty acids [SFA] among groups. It can be concluded that dietary nucleotides exerted positive effects on fatty acid composition in rainbow trout
ABSTRACT
Acanthopagrus latus is one of the major commercially exploited species in the Persian Gulf. In recent years, it has gained importance as a candidate for aquaculture. Haematological parameters of wild-caught specimens were studied during the pre-spawning period to determine if they are influenced by the sex of fish. Blood samples were collected from 55 Fish [30 female and 25 male] captured from the Musa Creek in the north-west Persian Gulf. RBC counts were higher in male than in female fish [P<0.05] and other parameters such as WBC, Hct, Hb, MCV, MCH, MCHC and leukocyte differential count did not show a significant difference between male and female fish
ABSTRACT
Stocking density induced stress that affects energy intake, growth rate, enzymatic activity and oxygen consumption in fish. In this study the development of antioxidant enzyme Glutathione peroxidase [GPX], catalase [CAT] and superoxide dismutase [SOD] in egg and larvae of rainbow trout [Oncorhynchus mykiss] that kept in different stocking density was investigated. Four groups of eggs, cultured in pans [size16x9.5x10 cm, volume 10 L] with density of 400egg/l [group1 as routine density], 200egg/l [group2 as low density] and 600egg/l [group3 as high density] in triplicate. Eggs were held in tanks supplied with flow-through freshwater at 10.8[degree sign]C. samples were taken at day1 [fertilization], 3 [Cleavage], 8[organogenesis], 16 [eyed egg], 31 [hatch] and 48 [active feeding]. A significant increase in GPX and SOD activity was seen from fertilization till eggs were eyed. [p<0.001]. The activity of these enzymes decreased to active feeding [p<0.001], meanwhile this activity was higher than the fertilization starts. Similar changes were seen in SOD and GPX activities in higher and lower densities [Group 2, 3]. CAT activity increased from fertilization to organogenesis and then toward active feeding significantly decreased in compare to fertilization [p<0.001]. Pattern of changes of catalase activity in high density group was similar to routine density but in low density group it was higher until eggs were eyed. GPX, SOD and CAT activities did not show significant difference in similar days among different groups [p<0.05]. Our results showed that rearing densities used in this study could not affect antioxidant defense development in early life stages of O. mykiss