The aim of this study was to determine the effects of replacing fish oil (FO) with laurel seed oil (LSO), as an alternative plant lipid source in diets on the growth and fatty acid composition of rainbow trout (Oncorhynchus mykiss; 111.47 AE 0.2 g mean individual weight). At the end of the feeding trial, survival was 100% in all treatments. No significant differences were seen in growth between the dietary groups (P > 0.05). The protein, lipid and ash contents were not significantly different among the groups (P > 0.05); however, there was a significant difference in protein and ash content between the treatment groups and the initial, and between the 50LSO group and the initial group, respectively (P < 0.05). The viscerosomatic index (VSI) and hepatosomatic index (HSI) values were not affected by increasing LSO percentages in the diets. The n-6 polyunsaturated fatty acid (PUFA) concentration increased with increasing LSO levels in the diets. In contrast, the n-3 PUFA levels decreased with increasing LSO levels in the diets. The liver and muscle were used for the analysis of fatty acids. The highest level of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) concentrations was recorded in fillet of fish fed the FO diet and the lowest in those fed the 50LSO diet. However, EPA and DHA ratios in the liver of fish fed the 75LSO diet were higher than those in fillet of fish fed the FO and 50LSO diets. No significant differences were seen in fatty acid composition between the dietary groups (P > 0.05). Based on the results of growth performance and fatty acid composition of the experimental fish in this study, it can be concluded that the 75% concentration of laurel seed oil performed best among the diets tested in the experiment.
A 60-day feeding trial was conducted to asses the potential nutritive value of sesame seed meal as a dietary replacement for soybean meal in the diets of rainbow trout (Oncorhynchus mykiss Walbaum, 1792). All diets were prepared to be isonitrogenous (49% protein), isolipidic (19% lipid) and isoenergetic (22 kJ g -1 ). Four different diets containing 0% (C), 10% (10SSM), 15% (15SSM) and 20% (20SSM) sesame seed meal were formulated for rainbow trout with a mean weight of 81.02±0.02 g and fish were hand fed feed twice a day to apparent satiety under a natural light regime. At the end of study, significant differences were found in final body weight, weight gain and specific growth rate (SGR, %) between control group (C) and the experimental groups (p<0.05). While there were no significant differences between the experimental groups in terms of feed conversion ratio (FCR) and protein efficiency rate (PER) (p>0.05), Apparent Net Protein Retention (ANPR) differed significant between C and 10SSM and 15SSM and 20SSM groups (p<0.05). The moisture, protein, lipid and ash contents in the body composition of the fish increased in all experimental groups. The moisture, lipid and ash content were not significantly differed among the groups (p>0.05) but protein contents of fish in 15SSM and 20SSM groups was significantly higher than fish in control and 10SSM groups (p<0.05). There were also no differences in the digestibility of crude protein among groups (p>0.05). Comparable performance in growth, nutrient utilization and crude protein deposition of rainbow trout fed by diet containing 15% sesame seed meal showed that these meals could be used as this rate. Keywords: Alternative plant protein source, amino acids, growthÖz: 60 günlük besleme denemesi, gökkuşağı alabalığı (Oncorhynchus mykiss Walbaum, 1792) diyetlerinde soya küspesi yerine susam tohumu küspesinin potansiyel besleme değerini değerlendirmek için yapılmıştır. Tüm diyetler izonitrojenik (%49 protein), isolipidik (% 19 yağ) ve isoenerjik (22 kJ g -1 ) olarak hazırlanmıştır. %0 (C), %10 (10SSM), %15 (15SSM) ve %20 (20SSM) susam tohumu küspesi ihtiva eden dört farklı diyet ortalama ağırlığı 81.02 ± 0.02 g olan gökkuşağı alabalıkları için formüle edilmiştir ve balıklar doğal ışık rejimi altında görülebilir tokluğa ulaşıncaya kadar günde iki kez elle beslenmiştir. Çalışmanın sonunda, kontrol (C) ve diyet grupları arasında final vücut ağırlığı, ağırlık kazancı ve spesifik büyüme oranında (SGR,%) önemli farklılıklar bulunmuştur (p<0.05
As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.
SummaryThis study compares the performance (in terms of survival and growth), biochemical and fatty acid compositions among all female diploid (AFD) and triploid (AFT) rainbow trout (Oncorhynchus mykiss). AFD and AFT fish with mean initial weights of 1,040.1 ± 1.3 and 1,039.7 ± 1.6 g, respectively, were reared and fed from March to August with a commercially extruded trout feed in a commercial freshwater fishfarm located in the Black Sea region (Samsun, Turkey). Survival was reduced throughout the experimental period in the AFT group with increasing water temperatures. At the end of the experiment, survival rates were 98.57 ± 1.43% and 82.38 ± 7.39% for the AFD and AFT groups, respectively. The AFD group showed significantly better growth performances in terms of weight gain, feed conversion rate (FCR), relative growth rate (RGR) and specific growth rate (SGR) than the AFT group (p < .05). Significantly less protein and greater fat content were also observed in the AFT group (p < .05). There was no significant difference between groups for fatty acid composition in meat, except for stearic acid (SA, C18:0) and docosahexaenoic acid (DHA, 22:6 n-3). While the greatest SA concentration was in the AFT group, the greatest DHA concentration was observed in the AFD group (p < .05). The results indicate that female triploid rainbow trout are more susceptible to suboptimal environmental conditions (especially to higher water temperatures) than female diploids. Although poor triploid performance was observed in this study, relative productivity might be enhanced by rearing triploids in optimal environmental conditions.
The effect of Cherry laurel (Laurocerasus officinalis roem.) leaf extract on the growth, survival and some antioxidant enzymes of rainbow trout (Oncorhynchus mykiss walbaum, 1792) exposed to oxidative stress induced by high temperature.
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