The effects of freshwater rearing on the whole body and muscle tissue fatty acid profile of the European sea bass (<Emphasis Type="Italic">Dicentrarchus labrax</Emphasis>)     

Arzu Özlüer Hunt  Ferbal Özkan  Kenan Engin  Nazmi Tekelioğlu 《Aquaculture International》2011,19(1):51-61

The purpose of this study was to investigate the effect of freshwater rearing on the fatty acid profiles of the whole body and muscle tissue of the European sea bass (Dicentrarchus labrax). Half of initial fish were gradually acclimated to freshwater (FW) kept at the same temperature to salt water and grown in same conditions as their counterparts in saltwater (SW). The decrease in salinity caused an increase in the percentages of 18:1n − 9, 24:1n − 9, 18:3n − 3, 18:2n − 6 and decrease in the percentages of 14:0, 15:0, 20:0, 21:0, 20:5n − 3 and 22:6n − 3 both in the whole body and in the muscle tissue fatty acid profiles. The lipids of FW-reared fish contained significantly (P < 0.01) higher percentages of 18:2n − 6 and 18:3n − 6 than that of SW-reared fish. However, percentages of 20:5n − 3 and 22:6n − 3 fatty acids decreased significantly (P < 0.05) compared with those of salt water-reared European sea bass. There was a clear trend of decrement in the percentages of n − 3 PUFA fatty acids due to the decrease in water salinity. However, the percentages of n − 6 PUFA fatty acids were also increased with the decrease in water salinity. We concluded that the FW acclimation is followed by changes in certain lipid classes of sea bass muscle tissue and whole body samples. n − 3/n − 6 PUFA ratios were characteristic to previously reported ratios for both FW- and SW-reared European sea bass. In addition, EPA/DHA ratios were basically similar for the fish reared in both SW and FW indicating the equal nutritional value of the final products in terms of providing PUFA’s for human nutrition.  相似文献   

不同水分和添加物料对石灰性土壤无机磷形态转化的影响   总被引：7，自引：2，他引：7  

安志装  介晓磊  李有田  白由路  魏义长  刘世亮 《植物营养与肥料学报》2002,8(1):58-64

利用轻粘质土壤 ,模拟石灰性土壤中不同的组分因素进行室内培养试验。结果表明 ,水溶性磷肥施入土壤后很快向其它无机磷形态转化 ,主要转化为Fe-P ,其次是Ca2-P、Ca8-P和Al-P ,而很少转化为O-P和Ca10-P。其转化规律受不同培养组分因素的影响。较低的土壤水分含量 (200g/kg)利于Ca8-P、Al-P向Fe P和Ca10-P的转化 ,过高的水分含量 (200g/kg)有利于Ca10-P的活化与Fe-P的大量生成 ;不同量CaCO3加入促进了Fe-P、Al-P以及Ca2-P向Ca8-P、Ca10-P方向转化 ;秸杆、腐植酸的加入增加了各形态无机磷量以及无机磷总量。随培养时间的延长 ,Al-P、Fe-P等形态的磷量减少 ,Ca8-P、Ca10-P形态的量增加。不同量秸杆以及腐植酸的加入不同程度地降低了速效磷下降的幅度 ,提高了土壤速效磷水平。  相似文献   

长期不同施肥制度对红壤性水稻土活性有机质及碳库管理指数的影响   总被引：6，自引：1，他引：6  

吴小丹  蔡立湘  鲁艳红  谢坚  廖育林  郑圣先  聂军 《中国农学通报》2008,24(12):283-288

以长期定位试验点的红壤性水稻土为研究对象,研究了长期不同施肥制度对红壤性水稻土活性有机质和碳库管理指数的影响。试验处理为：CK（不施任何肥）;NK（施氮钾肥）;NPK（施氮磷钾肥）;NK+PM（施氮钾肥＋猪粪）;NPK+RS（施氮磷钾肥＋稻草）。结果表明：红壤性水稻土中的活性有机质以中活性有机质为主,施肥对活性有机质组分影响明显。连续种植25年水稻后,CK处理的土壤活性有机质含量降低,CMI(碳库管理指数)下降。施肥能够提高土壤有机质、活性有机质各组份的含量和碳库管理指数,CMI以NPK+RS处理上升最大,NK处理最小,说明有机-无机肥配施对活性有机质组分影响较单施化肥更明显。土壤活性有机质含量和CMI的增幅大于土壤总有机质的增幅,水稻产量与CMI的相关性达到极显著水平。CMI是评价施肥制度对土壤质量影响的良好指标。  相似文献   

显性无腺体与隐性无腺体陆地棉品种间杂种二代利用研究   总被引：9，自引：2，他引：9  

袁有禄  张天真  靖深蓉  潘家驹  刘少林  邢朝柱  郭立平  王海林 《棉花学报》1999,(1)

利用４个隐性低酚棉品系为母本，５个显性无腺体品系为父本，按不完全双列杂交（ＮＣⅡ）设计配制２０个组合，利用亲本、Ｆ１和Ｆ２材料采用ＡＤＡＡ模型研究表明，衣分以加性效应为主，其余产量及产量构成因素以显性遗传效应为主。子棉产量和铃重有较低的上位遗传效应。纤维品质性状中，绒长与整齐度以显性遗传效应为主，绒长还存在少量上位效应；比强度与伸长率仅存在显著的加性遗传效应，麦克隆值以加性遗传效应为主。Ｆ１皮棉产量、第一次收花率、单株铃数、铃重和衣分的群体超亲优势平均值分别为：２７．９％、１８．７％、１６．２％、９．７％和１％，Ｆ２分别为：１０．８％、５．１％、４．５％、４．６％和－１．２％。Ｆ１绒长的群体平均优势为２．５％，比强度和伸长率为－１．８和０．８％，麦克隆值和整齐度分别为－０．２％和－２．７％。Ｆ２绒长略呈下降趋势，比强度、伸长率和麦克隆值Ｆ２与Ｆ１相近，整齐度Ｆ２略优于Ｆ１。表明了显性无腺体基因的杂种优势利用前景广阔。  相似文献   

Correction to: Population fluctuations of the citriculus mealybug,Pseudococcus cryptus Hempel (Hemiptera: Pseudococcidae), in citrus orchards of Samandağ, Hatay,Turkey     

Telli  Selda  Yiğit  Abdurrahman 《植物病害和植物保护杂志》2019,126(5):427-428

Journal of Plant Diseases and Protection - In the original publication, Fig.&nbsp;1 was incorrectly published with repeated values for the years 2008 and 2009.  相似文献   

Lactobacillus spp. bacteria as probiotics in gilthead sea bream (Sparus aurata, L.) larvae: Effects on growth performance and digestive enzyme activities     

Cüneyt Suzer  Deniz oban  H. Okan Kamaci  ahin Saka  Kürat Firat   zge Otgucuolu  Hakan Küüksari 《Aquaculture (Amsterdam, Netherlands)》2008,280(1-4):140-145

In this study, the influence of commercial probiotic, Lactobacillus spp., supplementation was investigated on growth parameters and digestive enzyme activities in gilthead sea bream, Sparus aurata, during larval development. All experiments were triplicated and designed in three different administrations of probiotic from 3 days after hatching (DAH) concurrently with starting of exogenous feeding. In the first group, probiotic was added to live food (rotifer and Artemia). In the second group, probiotic was supplemented directly to both live food and water. In the third group, probiotic was added directly to water. Also, no probiotic treatment was maintained in control group. Total bacterial counts among probiotic probiotic-supplemented groups were significantly different from total bacterial counts in controls in water and digestive tract of larvae (p < 0.05). The mean of total bacterial counts in control was approximately 4 × 10⁴-fold increased from the experimental groups in the sea water (p < 0.05). Besides, mean digestive enzyme activities of all probiotics treatment groups were significantly different (p < 0.05) with that of the control. Except probiotic water supplementation group, in all treatments, the specific activities of pancreatic and intestinal enzymes were significantly higher (p < 0.05) in larvae to which probiotic had been supplemented by live food and live food with water. Also, S. aurata larvae that had probiotic administered by live food with water demonstrated significant (p < 0.05) increases in both survival (13–105% higher) and specific growth rate (2–9% higher) as compared to controls. As a result, supplementation of probiotic to directly tank water could not significantly increase growth parameters and digestive enzyme activities and therefore, administration of probiotics by this method would not be effective in terms of husbandry parameters and nutritional condition.  相似文献   

Use of Onion (Allium cepa) and Garlic (Allium sativum) Wastes for the Prevention of Fungal Disease (Saprolegnia parasitica) on Eggs of Rainbow Trout (Oncorhynchus mykiss)     

Halil Özçelik  Yiğit Taştan  Ertugrul Terzi  Adem Yavuz Sönmez 《Journal of fish diseases》2020,43(10):1325-1330

This study was designed to prevent fungal disease (Saprolegnia parasitica) that occurs on rainbow trout eggs (Oncorhynchus mykiss) by using wastes of onion (Allium cepa) and garlic (Allium sativum) plants. For this purpose, fertilized rainbow trout eggs were exposed to garlic skin, garlic stem and onion skin aqueous methanolic extracts by bathing in concentrations of 0.4, 0.8, 1.6 and 3.2 g/L, whereas the control group was left untreated. The larvae in all groups were monitored until they become free-swimming larvae, the number of eggs died due to fungus was recorded, and the data obtained from experimental groups and control group were compared. As a result, it was determined that onion skin had no effect on the number of eggs that died due to fungus (p > .05), while garlic skin and garlic stem extracts significantly reduced the number of fungal infestations without affecting the number of live larvae or the embryological development of the eggs (p < .05). In light of these data, we conclude that garlic skin (0.4, 0.8, and 1.6 g/L) and garlic stem (0.8 and 1.6 g/L) aqueous methanolic extracts are effective at preventing Saprolegnia parasitica infestation on rainbow trout eggs and may be used in aquaculture.  相似文献   

中国的特种稻米   总被引：1，自引：0，他引：1  

仲维功  陈志德  杨杰  宋小禄  许济川 《金陵科技学院学报》1999,(3)

中国的特种稻米包括黑、紫、红等有色稻米和白色香米, 其原始品种主要分布在我国西南高原山区, 一般产量较低, 经创新与改良后的特种稻米, 保留了原品种的特色, 降低了植株高度, 提高了抗病性, 产量水平已达到5.25～7.5 t·hm - 2。品质分析结果表明: 特种稻米除了具有普通稻米的营养成分外, 部分品种富含矿物微量元素, 尤其富含铁 (Fe) 和硒(Se)。经医学临床试验, 对儿童缺铁性贫血、糖尿病患者及产妇有显著疗效和滋补作用。近年来特种稻米种植面积在逐步扩大, 白色细长粒香米已上市场, 用以替代进口的泰国香米, 有色米亦已被用做糕点等原料, 黑紫米皮已被提取天然色素作为食品添加剂  相似文献   

太平洋牡蛎2龄贝的生长     

王志松  孙景伟  刘忠颖  李大成  王军  王笑月  隋锡林  刘璐 《水产科学》2000,19(6):17-18

通过１９９８扑３月 １２月对太平洋牡蛎２龄贝生长进行测定得出：壳高在４～６月初生长最快;７月、１２月为出肉率最高时期;７月末８月初为２龄贝产卵期。  相似文献   

Study on the Piezoresistive Effect in P type Diamond Films     

FANG Liang  WANG Wan lu  DING Pei dao  LIAO Ke jun  WANG Jian 《保鲜与加工》2000,(1):78

The piezoresisitive effect of p type diamond films is analyzed by deformation potential theory and valence bands split off model.It is found that the great difference of the efficient mass between the heavy and light hole of diamond is one of the main factors which are responsible for the piezoresistive effect in the p type diamond films.The gauge factor calculation formula is obtained according to the strain induced heavy and light hole band splitting off model,and the calculation results are in accordance with the experimental results.  相似文献