共查询到17条相似文献，搜索用时 125 毫秒
1.
研究了外源性蜕皮激素对凡纳滨对虾生长和表观消化率的影响，实验时在基础饲料中分别添加0．1％、0．2％、0．4％的两种市售蜕壳素产品，制成6种外源性脱壳素配合饲料，不添加的基础饲料作为对照组，试验在260L玻璃钢循环水养殖系统中，每个剂量组设3个重复，8周生长试验结果表明：市售蜕壳素产品能有效地促进对虾生长，试验结束时，试验组虾体增重分别较对照组增加16．8％、7．52％、5．9％、11．4％、29．07％、16．53％，但是凡纳滨对虾对饲料粗蛋白的表观消化率没有明显地提高，凡纳滨对虾对脂肪的表观消化率较低。推算凡纳滨对虾饲料中最佳蜕皮酮添加量为60mg/kg。 相似文献
2.
研究了外源性蜕皮激素对凡纳滨对虾生长和表观消化率的影响 ,实验时在基础饲料中分别添加 0 .1%、0 .2 %、0 .4 %的两种市售蜕壳素产品 ,制成 6种外源性脱壳素配合饲料 ,不添加的基础饲料作为对照组 ,试验在 2 6 0L玻璃钢循环水养殖系统中 ,每个剂量组设 3个重复 ,8周生长试验结果表明 :市售蜕壳素产品能有效地促进对虾生长 ,试验结束时 ,试验组虾体增重分别较对照组增加 16 .8%、7.5 2 %、5 .9%、11.4 %、2 9.0 7%、16 .5 3% ,但是凡纳滨对虾对饲料粗蛋白的表观消化率没有明显地提高 ,凡纳滨对虾对脂肪的表观消化率较低。推算凡纳滨对虾饲料中最佳蜕皮酮添加量为 6 0mg/kg。 相似文献
3.
在凡纳滨对虾饲料中添加不同量微生物植酸酶（0，500，1000，2000U／k），观察虾的存活率、增重率、饲料系数及虾体和虾壳成分，研究饲料中添加植酸酶对凡纳滨对虾生长性能的影响。结果表明：饲养8周后，饲料中添加500-2000U／kg植酸酶对凡纳滨对虾增重率、存活率和饲料利用元显著影响（P〉0．05）；植酸酶添加各组与对照组虾体的水分、粗蛋白、脂肪、灰分、总钙和总磷含量差异不显著；虾壳中粗灰分和钙含量在500和1000U／k组显著高于对照组和2000U／kg组（P〈0．05），虾壳磷含量在各饲料组间差异不显著。血清磷浓度在对照组和2000U／kg组显著高于500U／kg组（P〈0．05），血清钙浓度在组间差异不显著，血清碱性磷酸酶活性以对照组最高，显著高于500和1000U／kg组。结果说明，在特定试验条件下，饲料中添加植酸酶对凡纳滨对虾幼虾的虾壳和血清成分有显著影响（P〈0．05），对幼虾生长性能影响不显著（P〉0．05）。 相似文献
4.
不同形式钴对凡纳滨对虾生长和组织钴含量的影响 总被引：1，自引：0，他引：1
为研究氨基酸鳌合钴对凡纳滨对虾的营养效果．在凡纳滨对虾配合饲料中添加5、10、15mg／kg的氯化钴和蛋氨酸钴。饲养8周．4周末（饲养中期）称重．8周末称重并采集对虾肝胰脏和肌肉．测定肝胰脏和肌肉中的钴含量。结果表明：钴的添加形式和钴水平不影响对虾0～4周增重率．15mg／kg蛋氨酸钴显著提高了对虾0～8周增重率，且两种形式的钴之间差异显著（P〈0．05）。5、10mg／kg的蛋氨酸钴和5、10、15mg／kg的氯化钴不影响8周末对虾的增重率。特定生长率、饲料系数和蛋白质效率的变化趋势与增重率类似。钴的添加形式和钴水平不影响肌肉中的钴含量。15mg／kg的氯化钴组肝胰脏中钴含量显著高于对照组（P〈0．05）．其他各组间无显著差异；蛋氨酸钴各组肝胰脏中钴含量无显著差异；钴的添加形式不影响肝胰脏中钴含量。统计结果表明。促进生长方面，两种钴之间存在显著差异，蛋氨酸钴的营养效果好于氯化钴。饲料中蛋氨酸钴的添加量为15mg／kg时．对虾生长最快．5mg／kg时．可满足需要。 相似文献
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采用静水生物试验法测定了氟乐灵对斑节对虾卵和幼体的急性毒性。结果表明：氟乐灵对斑节对虾无节幼体、蚤状幼体、糠虾幼体和仔虾的２４ｈＬＣ５０／×１０－６分别是１．６８，０．８３，１．８４和２．０９；４８ｈＬＣ５０／×１０－６分别是０．７６，０．５３，１．０９和１．５１。５．０１×１０－６氟乐灵浸浴受精卵１２ｈ，５０％的受精卵可孵化。第２２天仔虾用１０×１０－６以下浓度的氟乐灵浸浴５ｍｉｎ，对其存活率无影响。 相似文献
6.
植酸酶对凡纳滨对虾生长性能和体成分的影响 总被引：1，自引：0，他引：1
在凡纳滨对虾饲料中添加不同量微生物植酸酶(0,500,1000,2000 U/kg),观察虾的存活率、增重率、饲料系数及虾体和虾壳成分,研究饲料中添加植酸酶对凡纳滨对虾生长性能的影响。结果表明:饲养8周后,饲料中添加500~2000 U/kg植酸酶对凡纳滨对虾增重率、存活率和饲料利用无显著影响(P>0.05);植酸酶添加各组与对照组虾体的水分、粗蛋白、脂肪、灰分、总钙和总磷含量差异不显著;虾壳中粗灰分和钙含量在500和1000 U/kg组显著高于对照组和2000 U/kg组(P<0.05),虾壳磷含量在各饲料组间差异不显著。血清磷浓度在对照组和2000 U/kg组显著高于500 U/kg组(P<0.05),血清钙浓度在组间差异不显著,血清碱性磷酸酶活性以对照组最高,显著高于500和1000 U/kg组。结果说明,在特定试验条件下,饲料中添加植酸酶对凡纳滨对虾幼虾的虾壳和血清成分有显著影响(P<0.05),对幼虾生长性能影响不显著(P>0.05)。 相似文献
7.
4种对虾耗氧率、CO_2排出量、呼吸商和窒息点的研究（英文） 总被引：1，自引：0，他引：1
蒋静南 《广东海洋大学学报》1999,(1)
较系统研究了斑节对虾、墨吉对虾、日本对虾和刀额新对虾等４种对虾的耗氧率、ＣＯ２排出量、呼吸商和窒息点。结果表明，同一种类不同大小和不同种类及生活习性不同，耗氧率、ＣＯ２排出量、呼吸商和窒息点有较大的差别。日本对虾、刀额新对虾的耗氧率、ＣＯ２排出量比其他两种虾低。墨吉对虾次之，斑节对虾为最高。对ＤＯ忍受能力，刀额新对虾最强，在ＤＯ０．６０ｍｇ／Ｌ才开始出现窒息。斑节对虾次之，在ＤＯ降至０．８８ｍｇ／Ｌ出现窒息。墨吉对虾在ＤＯ１．１９ｍｇ／Ｌ出现窒息。日本对虾忍受ＤＯ能力最差，在以ＤＯ１．３１ｍｇ／Ｌ出现窒息。 相似文献
8.
植物生长调节剂对绿色夫藻生长的影响 总被引：1，自引：0，他引：1
研究了二种植物生长调节剂对绿色巴夫藻（Ｐａｖｌｏｖａ ｖｉｒｉｄｉｓ）的生长、叶绿素含量和干重的影响。结果表明，在试验浓度范围内，２，４－Ｄ对绿色巴夫藻生长的影响在培养早期比后期明显，最适浓度为０．１ｍｇ／Ｌ；６－ＢＡ质量浓度≥１ｍｇ／Ｌ时对绿色巴夫藻有致死作用，质量浓度为０．１～０．８ｍｇ／Ｌ时，对绿色巴夫藻的生长有促进作用，促进生长的最适质量浓度０．５ｍｇ／Ｌ。在一定浓度范围内，二种植物生长调节剂都可促使绿色巴夫藻的生长，提高叶绿素含量，增加试验藻的干重。 相似文献
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采用批量培育法研究了在面包酵母悬浮液中添加不同浓度的脂溶性维生素对褶皱臂尾轮虫（Ｂｒａｃｂｉｏｎｕｓｐｌｉｃａｔｉｌｉｓ）增殖率的影响。结果表明：面包酵母对褶皱臂尾轮虫的生长繁殖是有营养缺陷的。在面包酵母悬浮液中．当添加维生素Ａ为０．０２～５．００μｇ／ｍｌ时，随着添加浓度的增大，轮虫的种群增殖率Ｒ值也增大。以添加５．００μｇ／ｍｌ为最佳，第４天的Ｒ值达０．７５，是对照组的５．６倍。添加维生素Ｄ０．００５～０．２０μｇ／ｍｌ对轮虫的增殖有一定促进作用，以添加０．０５μｇ／ｍｌ为最佳，第７天的Ｒ值为０．４０７，是对照组的２．７倍。添加维生素Ｅ０．００１～０．０１μｇ／ｍｌ和添加维生素Ｋ０．０１～０．１０μｇ／ｍｌ时，第４天的Ｒ值与对照组无差异。 相似文献
10.
利用稳定同位素碳比率δ13C作为天然示踪物,对高位养殖池生态系统中人工饲料和天然饵料提供的能源物质对养殖凡纳滨对虾生长的贡献比率进行研究。结果表明:虾体的δ13C值受食物δ13C值的影响,由于其摄食饵料的δ13C值逐渐减小,虾体的δ13C值也逐渐降低,逐渐接近于最后人工饲料的δ13C值,试验虾体的δ13C值由养殖开始时的-19.52‰±0.09‰变为实验结束时的-21.74‰±0.17‰;对虾的食性在10d左右时发生转变,34d左右时人工饲料和浮游动物对虾体的能量贡献基本相同,养殖结束时对虾生长能量的97.29%±0.98%来源于人工饲料。 相似文献
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The influence of Bacillus probiotics on the digestive enzyme activity and the growth of Litopenaeus vannamei were de-termined in this study. The shrimp was treated with five percentages (1.5, 3.0, 4.5, 6.0 and 7.5) of probiotics (Bacillus spp.) supple-mented to the feed and cultured for 45d. The growth measured as the weight gain at the end of culturing was significantly (P<0.05) higher in probiotic-treated shrimps than that of the control (without receiving probiotics). Activities of protease and amylase, two digestive enzymes of the midgut gland and the intestine were significantly (P<0.05) higher in probiotic-treated shrimp than in the control. 相似文献
13.
A study on the nonspecific immunity of Litopenaeus vannamei ever inhabiting freshwater and seawater was carried out at different molt stages by comparing their total hemocyte count(THC) and respiratory burst(RB) and activity of phenol oxidase(PO), nitric oxide synthase(NOS) and lysozyme(LY). Two-way ANOVA showed that salinity and molt stage independently affected THC and RB and the activity of PO, NOS and LY of juvenile L. vannamei significantly(P 0.05). The THC and RB and the activity of NOS gradually increased from the post-molt stages(A and B) to the pre-molt stages(D0–D3), which were common in shrimps inhabiting freshwater and seawater. The activity of PO peaked at the inter-molt stage(C), and touched the lowest at the post-molt stage in freshwater and pre-molt stage in seawater. The activity of LY was stable over the molt cycle. The RB and the activity of PO, NOS and LY of juvenile L. vannamei were significantly lower in freshwater than in seawater; whereas THC was significantly higher in freshwater than in seawater(P 0.05). It was concluded that the post-molt stage(especially stage A) was critical to shrimp culture, which should be intensively attended when L. vannamei was cultured in freshwater. 相似文献
14.
REQUIREMENTS OF SHRIMP, PENAEUS CHINENSIS O''''SBECK FOR POTASSIUM, SODIUM, MAGNESIUM AND IODINE 总被引：2，自引：0，他引：2
Potassium, sodium, magnesium and iodine requirements of shrimp, Penaeus chinensis were studied.Orthogonal design was employed in this experiment. The composition of the basal diet consisted of fishmeal, peanut cake, corn meal, soybean cake, wheat bran, vitamin mix and mineral mix, and supple-mentations of potassium, sodium, magnesium and iodine in the basal diet were made according to theL_9(3~4) orthogonal table. The results indicatal that iodine supplementation improved growth of the shrimpsignificantly and raised survival very significanly, iodine requirement of the shrimp was 0.003%, sodiumrequirement was 0.87% or less; and that 1.1-1.3% potassium and 0.18-0.38% magnesium in the dietwere proper nutrition supplements for the shrimp. 相似文献
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陈炳良 《中国海洋湖沼学报》1994,(2)
A small amount of heavy metal binding protein,identified by BioRad Protein Assay,has been iso-lated from the adult brine shrimp,Artemia franciscanus.This protein has an apparent molecular weight be-tween 6000 to 9000 dalton.a UV absorption peak at 260 instead of 280 nm like most proteins;andhas high affinity towards binding with radioactive labeled ~(109)Cd.These characteristics are similarto that of metallothioneins reported for many vertebrate and invertebrate,marine and terrestrialanimals.After the brine shrimp is exposed to a small amount of Cd~(2+)for 24 h,a large amount ofmetallothionein can be isolated,showing the inducibility of this detoxifying protein in the adult Artemiain a short period of time. 相似文献
17.
Biofloc technology has been applied successfully in the intensive aquaculture of several fish and shrimp species.The growth of heterotrophic microorganisms can be stimulated through adding extra carbon,which reduces the nitrogen level in the water and provides microbial protein to the animals.However,most of the studies and practical applications have been conducted in freshwater and marine environment.This paper focused on brine shrimp Artemia that lives in high salinity environment together with other halophilic or halotolerant microorganisms.The effect of carbon supplementation on Artemia growth,water quality,and microbial diversity of bioflocs was studied in the closed culture condition without any water exchange.The salinity of the culture medium was 100.A 24-d culture trial was conducted through supplementing sucrose at carbon/nitrogen(C/N)ratio of 5,15,and 30(Su5,Sul5,and Su30),respectively.The culture without adding sucrose was used as a control.Artemia was fed formulated feed at a feeding ration of 60% recommended feeding level.The results showed that sucrose supplementation at higher C/N ratio(15 and 30)significantly improved the Artemia survival,growth and water quality(P0.05).Addition of sucrose at C/N ratio of 15 and 30 significantly increased biofloc volume(BFV)(P0.05).The Illumina MiSeq sequencing analysis showed that supplementing carbon at C/N ratio of 15 had a better total bacterial diversity and richness,and shaped the microbial composition at genera level.This study should provide information for studying the mechanism of biofloc technology and its application in high salinity culture conditions. 相似文献